The Complete Masonry Heater Planning Guide
Design, Sizing, Finishing and Construction for Homeowners, Builders, and Architects in North America
By Eric Moshier – Certified Heater Mason, Third-Generation Mason, MHA Technical Committee Member, ASTM E1602 Masonry Heater Group Member
Download the Complete Masonry Heater Planning Guide (all 11 chapters, one PDF):Â Masonry Heater Planning Guide 2026 PDF
Planning a Masonry Heater: What You Need to Know
This masonry heater planning guide covers everything from heat loss calculations and model selection through foundation design, chimney systems, finishing options, and total installed cost. Planning a masonry heater starts with a heat loss calculation for your home, then selecting the right SR Core firebox size – SR-13, SR-18, or SR-22 – based on your heated square footage, ceiling height, and climate zone. A complete installed masonry heater in natural stone or brick typically costs between $25,000 and $37,000 depending on size, finish, and site conditions. Most installations in well-insulated homes between 1,500 and 2,000 square feet use the SR-22HBO as the primary heat source. Foundation, building code, chimney, and finish material selection all need to be resolved before construction begins. This masonry heater planning guide covers all of it, chapter by chapter.
Masonry Heater Planning Guide Contents – Jump to Any Chapter
This masonry heater planning guide is organized into 11 chapters. Each chapter is also available as a standalone PDF download for readers with limited internet access.
Chapter 1 – What Is a Masonry Heater | Download chapter PDF
Chapter 2 – The Benefits of Masonry Heating | Download chapter PDF
Chapter 3 – Designing and Sizing Your Masonry Heater | Download chapter PDF
Chapter 4 – The SR Core System | Download chapter PDF
Chapter 5 – Foundations | Download chapter PDF
Chapter 6 – Chimney Systems | Download chapter PDF
Chapter 7 – Finishing Options | Download chapter PDF
Chapter 8 – Code, Clearances, and Building Permits | Download chapter PDF
Chapter 9 – Working With a Builder or Going DIY | Download chapter PDF
Chapter 10 – Frequently Asked Questions | Download chapter PDF
Chapter 11 – SR Products, Services, and 2026 Pricing | Download chapter PDF
Chapter 1: What Is a Masonry Heater?
A Heating System Unlike Any Other
A masonry heater is a wood-burning heating appliance built from dense, heat-storing masonry materials – firebrick, refractory castings, stone, or tile – that stores a large amount of heat energy from a short, hot fire and then radiates that heat slowly and evenly into your living space over the next 12 to 24 hours.
Because the heater stores heat in its mass rather than releasing it immediately, you can burn wood at its most efficient temperature – fast and hot, with near-complete combustion – without overheating your home. The fire is done in two hours. The warmth continues all day.
This is fundamentally different from every other wood-burning appliance available in North America. A wood stove releases heat as fast as it burns, which means to stay comfortable you constantly regulate the fire – often by damping it down, which produces smoke, creosote, and incomplete combustion. A fireplace sends roughly 80 to 90 percent of its heat straight up the chimney. A masonry heater does neither of these things.
A Brief History: 1,000 Years of Masonry Heating
Masonry heaters are not new technology. They are among the oldest and most refined heating systems in human history. From the 10th century onward, homes throughout Europe were heated with wood-burning masonry stoves. By the 15th century, wood shortages had become a serious crisis, and European governments began investing heavily in more efficient stove designs. Kings in Prussia, Sweden, Norway, and Denmark commissioned their craftsmen and architects to develop better designs – an effort that produced the modern contraflow masonry heater, a design that has remained essentially unchanged because it is already close to optimal.
In Germany, roughly 19,000 masonry heaters are built every year by trained craftsmen working in a dedicated trade. All of North America builds fewer than 1,000. The gap is not about quality or performance. The gap is about education. That is why this guide exists.
How a Masonry Heater Works
When you fire a masonry heater, the hot combustion gases travel through a series of internal channels that maximize their contact with the surrounding masonry before exiting through the chimney. By the time the gases leave the heater, they have surrendered most of their heat to the mass. Exhaust temperatures from a masonry heater chimney typically run between 200 and 300 degrees Fahrenheit. A conventional wood stove or fireplace may exhaust gases at 600 to 900 degrees, sending most of that energy straight outdoors.
Because the masonry mass stores the heat, you do not need to regulate the fire to control your room temperature. You burn a full fuel charge – typically 35 to 65 pounds of wood depending on your model – as hot and fast as the firebox allows. The fire burns completely in about two hours.
Wood gases must reach approximately 1,100 degrees Fahrenheit to burn completely. In a masonry heater operating at full fire, combustion temperatures routinely exceed 1,500 degrees Fahrenheit. Almost nothing escapes unburned. Particulate emissions have been independently tested at less than 1 gram per kilogram of wood burned. Open fireplaces average over 17 grams. Conventional wood stoves average over 15 grams. Even EPA Phase II certified wood stoves average over 7 grams. Masonry heaters are the cleanest way to burn cordwood, period.
The US EPA classifies masonry heaters as non-affected facilities – specifically excluded from certification requirements because they already meet or exceed the spirit of what EPA certification is trying to achieve.
>> Emissions testing data and Lopez Labs results
>> View completed heater gallery
Download Chapter 1 as a PDF for offline reading: Chapter 1 PDF
Download the complete guide (all 11 chapters): Complete Planning Guide PDF
Chapter 2: The Benefits of Masonry Heating
Radiant Heat: Why It Feels Different
The single most important thing to understand about masonry heating is that it is a radiant heating system, not a convective one. Your body loses heat through two mechanisms: convection (the air temperature around you) and radiation (the infrared energy emitted by surfaces in your environment). In an average winter house, about 60 percent of your body heat loss is through radiation.
This means that the temperature of the air in a room tells only part of the story about whether you feel comfortable. What matters equally is the mean radiant temperature – the average surface temperature of the walls, floors, and objects around you. When surfaces are warm, you feel warm even at lower air temperatures. A masonry heater creates this effect inside your home. The large, warm surface area of the heater radiates infrared energy into the room, warming walls, floors, furniture, and people directly.
Research from the Tulikivi Radiant Heat Study and independent European studies consistently shows that radiantly heated rooms feel comfortable across a wider range of air temperatures than convectively heated rooms. People in radiantly heated spaces typically set their thermostats 2 to 4 degrees lower than in comparable forced-air homes, reducing fuel consumption proportionally.
Less Dust and Better Air Quality
Forced-air heating systems circulate dust, allergens, and fine particles throughout your living space every time the blower runs. Masonry heat does not move air at all. The gentle convection currents created by the warm heater surface are minimal, and there is no blower to push dust around. People with allergies and respiratory conditions consistently report significant improvement in winter air quality when switching to radiant masonry heat.
Even Temperature Throughout the Day
Because masonry heaters release heat slowly and steadily over many hours, room temperatures remain remarkably stable. There are no cycles of hot and cold, no periods of overheating followed by cool-down. Radiant heat also reduces stratification – that layering of warm air at the ceiling and cold air at the floor that forced-air systems create. Ceiling fans are rarely needed in radiantly heated rooms.
Environmental Benefits
When trees grow, they absorb carbon dioxide from the atmosphere and store it as cellulose. When you burn wood, you are releasing carbon that was recently taken from the atmosphere, not carbon that has been sequestered underground for millions of years like fossil fuels. Provided that trees are harvested sustainably, burning wood has essentially zero net impact on atmospheric carbon dioxide.
Masonry heaters burn fast and hot, producing particulate emissions among the lowest of any solid fuel appliance you can legally install. Emissions data from Lopez Labs testing shows masonry heaters averaging under 1 gram of particulate matter per kilogram of wood burned – compared to 17.3 g/kg for open fireplaces and 15.3 g/kg for conventional wood stoves.
Long-Term Value
A well-built masonry heater is a multigenerational investment. There are masonry heaters in Europe that have been heating homes continuously for over 100 years. The average forced-air furnace lasts 15 to 20 years before requiring replacement. The materials in a masonry heater – stone, clay brick, refractory ceramics – are essentially permanent. The only components that typically require replacement over the life of the heater are the firebox liner and door, both designed to be field-replaceable.
>> Full emissions testing data and Lopez Labs results
>> Are masonry heaters worth it? Full cost analysis
>> View completed heater gallery
Download Chapter 2 as a PDF for offline reading: Chapter 2 PDF
Download the complete guide (all 11 chapters): Complete Planning Guide PDF
Chapter 3: Designing and Sizing Your Masonry Heater
Start With a Heat Loss Calculation
Before selecting a masonry heater model, you need a reasonable estimate of how much heat your home requires. We recommend LoadCalc.net for initial planning. It is free, accurate, and gives you the numbers you need. The sizing chapter of this masonry heater planning guide starts with heat loss.
Important: The BTU/hr figure from a heat loss calculation is peak demand on the coldest night of the year. A masonry heater’s output is not measured in BTU/hr the way a furnace is. The heater stores heat and releases it over 12 to 24 hours. Compare the heater’s total daily BTU output to your home’s total daily heat demand, not the peak hourly figure. If you size a masonry heater against a peak BTU/hr number, you will overbuild every time.
>> Free heat loss calculator – LoadCalc.net
Volume-Based Sizing
Square footage alone does not tell the full story. The volume of heated space is a more accurate starting point, because ceiling height dramatically affects the amount of air that needs to be heated. A 1,500-square-foot home with 8-foot ceilings has a heated volume of 12,000 cubic feet. The same footprint with a 14-foot vaulted ceiling has a heated volume of roughly 21,000 cubic feet – 75 percent more air to heat from the same floor area. Vaulted ceilings are one of the most common reasons a homeowner ends up needing a larger heater than the square footage would suggest.
Climate Zone
A home in northern Minnesota, northern Wisconsin, or the Upper Peninsula of Michigan has a significantly higher heat demand than the same home in Tennessee or North Carolina. For homes in heating degree day zones above 8,000, we size conservatively and often recommend the next model up if the home has any unusual heat loss factors.
Open Floor Plans Perform Best
Masonry heat travels in straight lines like sunlight, warming everything in its direct path. A closed room behind a wall will typically run 5 to 8 degrees cooler than the main living area. An upstairs room will run 8 to 15 degrees cooler depending on stair configuration and ceiling height. Clients who understand this before they build typically design their floor plans to maximize the heater’s natural radiant reach, locating it centrally and keeping the main living area open.
Selecting the Right SR Core Model
We offer three standard firebox sizes: the SR-13, SR-18, and SR-22. All three are available in both Hybrid and Cast configurations and support the full range of design options, oven choices, and heated bench additions. Heating area estimates assume 8-foot ceilings and Energy Star rated construction.
SR-13 (13″ x 18″ firebox): Covers approximately 1,000 to 1,200 square feet. Finished dimensions with 4-inch veneer: approximately 43″ W x 32″ D x 80″ H.
SR-18 (17″ x 18″ firebox): Covers approximately 1,500 to 1,800 square feet. Finished dimensions: approximately 48″ W x 32″ D x 80″ H.
SR-22 (22″ x 18″ firebox): Covers approximately 1,800 to 2,000 square feet. Finished dimensions: approximately 53″ W x 32″ D x 80″ H.
For most new construction homes between 1,500 and 2,000 square feet, the SR-22HBO – the SR-22 with a black bake oven – is the model we recommend most often. It handles the heating load comfortably, adds the functionality of the oven, and is well-suited to Midwest and northern climates.
When One Heater Is Not Enough
A single masonry heater can typically heat 1,000 to 2,000 square feet of well-insulated living space. For larger homes, two masonry heaters or a heater-plus-in-floor-radiant combination is typically the right answer. Two SR-18 heaters can adequately heat a well-insulated 3,000 to 3,500-square-foot home with proper floor plan design.
>> SR masonry heater systems and design
>> View completed heater gallery
Download Chapter 3 as a PDF for offline reading: Chapter 3 PDF
Download the complete guide (all 11 chapters): Complete Planning Guide PDF
Chapter 4: The SR Core System
Two Ways to Build: Hybrid Core vs. Cast Core
Every SR masonry heater is built around one of two core system types. Both deliver identical radiant heat performance. The difference is in the materials, the build time, and the kit cost.
SR Hybrid Core: Uses approximately 230 firebricks as the primary structural material with 18 cast refractory slabs. More economical kit cost with additional build time. Best for experienced builders, owner-builders comfortable with brickwork, or projects where kit cost is the primary consideration.
SR Cast Core: Uses approximately 40 firebricks with 55 precision refractory castings that fit together with minimal cutting. Fastest and least technically demanding system to build. Higher kit cost is typically offset by reduced labor time. Best for first-time builders, contractors without masonry backgrounds, or projects where speed and simplicity matter most.
Every kit ships with all materials needed to build the heater core: firebrick, refractory mortar, refractory slabs, insulation, gasketing, expansion material, and your SR doors. Also included: full course-by-course 2D SketchUp blueprint drawings in PDF format, 3D elevations, and custom architectural facade design services through our AIA-certified architect. Our instruction sets are consistently described by builders as the clearest and most complete in the industry.
Design and Venting Configurations
We select the appropriate configuration for each project based on your floor plan, chimney placement, desired options, and heating goals. You do not need to choose this yourself.
Finnish Contraflow: Gases travel from the firebox through or around the oven into a channel above, then down both side channels evenly before venting. Highly efficient, especially with a 3-sided heated bench and side chimney connection. Our most popular configuration.
J-Loop Design: Gases travel down one side, under the firebox, up the opposite side, and out through a top chamber. Strong, versatile performer across a wide range of floor plans.
Swedish 5-Run Design: Most compact design. Works well where horizontal footprint is a concern.
Russian Bell Design: Uses a large upper chamber into which hot gases rise and collect before cooling and descending. Produces very even, sustained heat output. The only design that readily accommodates a black bake oven on the side of the heater.
German and Austrian Kachelofen and Grundofen: Full calculated designs with extraordinary design freedom. Every channel, every dimension, and every material specification is calculated for maximum thermal performance before a single brick is laid.
Bake Oven Options
Black Oven (Direct Fire – Most Recommended): Flames and hot gases pass directly through the oven chamber before entering the heat exchange channels. During fire: exceeds 1,000 F. Two hours after fire: approximately 650 to 700 F (pizza). Three hours after fire: 400 to 500 F (hearth bread). Eight or more hours after fire: 350 F (slow roasting). Twelve hours after a 65 lb fire: still near 250 F.
White Oven (Indirect Fire): Hot gases travel around the outside of the oven chamber. Oven interior stays completely clean – no ash or soot. With one fire per day: 250 to 350 F. With two fires per day: 500 to 600 F. Ideal for roasting, casseroles, and slow baking.
Heated Benches
We design heated benches into approximately 85 percent of our heaters. The bench becomes part of the heater’s thermal mass. Additional gas channels run through the bench structure, slowing exhaust gases and extracting more heat from the same fire. Bench surface temperatures typically run between 100 and 140 degrees Fahrenheit – warm enough for comfortable seating or therapeutic use, not hot enough to burn. Heated bench pricing: $250 per linear foot.
Cook Stove Integration
A steel cook top integrated directly above the firebox uses the same fire that heats your home to heat your cooktop surface. Available in SR-13 and SR-18 firebox sizes. Bake oven and heated bench options can be incorporated. Designed for off-grid homes, cabins, and anyone who wants a single fire to handle both heating and cooking.
Domestic Hot Water
A stainless steel heat exchanger coil installed in the firebox can contribute to preheating your domestic hot water supply during the heating season. All domestic hot water systems must be engineered and installed by a licensed steam fitter. Important: a masonry heater will not adequately drive a glycol in-floor radiant system as a primary heat source. The hot water loop is appropriate for domestic hot water preheating only.
>> SR DIY masonry heater kits and pricing
>> View completed heater gallery
Download Chapter 4 as a PDF for offline reading: Chapter 4 PDF
Download the complete guide (all 11 chapters): Complete Planning Guide PDF
Chapter 5: Foundations
A masonry heater is not a piece of furniture you set on the floor. Depending on configuration, a fully finished heater with facing stone, foundation, and chimney can weigh 6,000 to 12,000 pounds or more. In virtually every case, the heater’s foundation must be structurally independent of the house framing – it sits on its own footing and does not transfer load to the floor joists.
Standard foundation specification: 4,500 psi concrete or better, 8 inches deep, with 1/2-inch rebar at 12 inches on center. The foundation layout and chimney placement must be determined during the design phase of your project, before the house framing is complete.
Foundation Types
Slab on Grade: The heater foundation is typically a thickened, reinforced section of slab poured to the heater’s footprint – at least 6 inches thick with additional rebar, poured on compacted soil, and tied into the main slab.
Full Basement – CMU or Poured Concrete: The foundation rises from a footing at or near the basement floor level up to the main floor subfloor level, then supports a reinforced concrete slab on which the heater core is built. CMU foundations are most common.
Making Use of the Foundation Interior
The hollow interior space inside a CMU foundation is some of the most useful square footage in the house if you plan for it. We routinely help clients incorporate access doors into the CMU foundation walls to create root cellars, firewood storage areas, secure storage for valuables, or space for a basement stove. For large heaters, we typically install a structural steel I-beam down the center of the foundation just below the top concrete slab to carry the full heater weight.
Here is an example of a masonry heater foundation plan from Solid Rock Masonry
For contractors, builders, and architects who need a working foundation drawing, you can download the foundation plan PDF here. Contact us with your specific heater model and configuration for drawings tailored to your project.
Outside Combustion Air
In most homes, dedicated outside combustion air is not required. Because the burn cycle is short – approximately two hours – and air consumption during firing is relatively modest, a standard house with normal air infiltration provides adequate combustion air. We typically do not install dedicated outside combustion air except in super-tight homes under approximately 1,000 square feet where air infiltration has been reduced to near zero.
>> Masonry heater building codes and clearances
Download Chapter 5 as a PDF for offline reading: Chapter 5 PDF
Download the complete guide (all 11 chapters): Complete Planning Guide PDF
Chapter 6: Chimney Systems
The chimney is not an afterthought. It is the engine that drives the entire combustion process. Good chimney draft makes lighting easy, produces complete combustion, and eliminates smoke spillage. Poor chimney design causes chronic startup problems, smoke spillage, creosote buildup, and in extreme cases, chimney fires.
Interior vs. Exterior Chimneys
An interior chimney passes through the conditioned space of your home before exiting through the roof. Because the chimney is surrounded by warm house air, it stays relatively warm and maintains strong draft throughout the heating season. An exterior chimney surrounded by cold outdoor air can become very cold between fires, which is the primary cause of difficult starts, smoke spillage, and creosote problems with masonry heaters.
Whenever possible, route your chimney through the interior of the building, exiting through the roof at or near the ridge. An interior chimney that stays warm performs reliably in all conditions. If an exterior chimney is unavoidable, an insulated factory-built chimney system is essential.
Chimney Options
Masonry Chimneys: Clay tile liner inside a brick or concrete block chase. Performs excellently when built correctly and located inside the thermal envelope. Minimum 18 feet of total height for adequate draft.
DuraVent DVL and Class A Factory-Built Systems: For most installations we specify DuraVent factory-built chimney systems. DVL double-wall stovepipe in the lower section transitions to Class A insulated chimney pipe through the attic and out the roof. The ceiling support box carries the full weight of the Class A chimney – the SR adapter is designed so that none of the chimney weight bears on the heater itself. This weight transfer detail is critical.
Combination – Clay Tile Plus DuraVent: For heated bench configurations with a side chimney connection, we often install approximately 8 feet of clay tile chimney rising from the bench before connecting to our SR chimney adapter and transitioning to DuraVent Class A.
Flue Sizing
SR-13: 7-inch round inside diameter, or equivalent 8×12 OD clay tile.
SR-18 and SR-22: 8-inch round inside diameter, or equivalent 8×12 ID clay tile.
The SR Chimney Adapter and Damper
Every SR heater using a metal chimney system is connected through our SR chimney adapter, which provides the transition from the heater’s clay tile connection to the metal chimney pipe and incorporates a shutoff damper. Closing the damper after the fire is completely out is one of the most important operational steps for maximizing heat retention.
Never close the damper while any combustion is still occurring. Closing the damper prematurely traps carbon monoxide in the heater and can allow it to enter the living space. Wait until the firebox coals are completely extinguished – typically 2 to 3 hours after loading – before closing the damper. When in doubt, wait.
>> Masonry heater building codes
Download Chapter 6 as a PDF for offline reading: Chapter 6 PDF
Download the complete guide (all 11 chapters): Complete Planning Guide PDF
Chapter 7: Finishing Options
The exterior finishing material of your masonry heater is more than aesthetic. The outer facing is part of the active thermal mass of the heater. A minimum of 4 inches of solid masonry on all sides is required by code and for performance.
Natural Stone Veneer
Full 4 to 5.5-inch natural stone veneer is the finishing material our clients choose most often. Natural stone has outstanding thermal mass properties, ages beautifully, and requires essentially no maintenance. Minnesota fieldstone, quartzite, granite, limestone, and sandstone all work well. Thin stone veneer at 1 to 1.5 inches is not appropriate – it does not provide adequate thermal mass and is not code-compliant as a heater facing.
Brick Veneer
Common face brick at 4 inches is the second most common finishing choice. Brick is somewhat more economical than stone in most markets and available in a wide range of colors and textures. The mortar color selection is as important as the brick color.
Concrete Block with Stucco or Thin Veneer Stone
CMU construction with a stucco or thin real stone veneer finish is the most economical finishing approach and is well-suited to contemporary, Scandinavian, or farmhouse aesthetics. Thin real stone veneer at 3 to 4 inches applied over CMU combines the economics of CMU construction with the warmth and texture of natural stone.
Limewash and Stucco Finishes
Lime-based finishes – traditional lime plaster, natural hydraulic lime stucco, and limewash – are among the most historically authentic finishes for masonry heaters and are experiencing a strong resurgence in contemporary design. Lime finishes are vapor-permeable, working in harmony with the thermal cycling of the heater. Traditional portland cement stucco can develop hairline cracks over time due to the repeated heating and cooling cycles; lime-based finishes are more flexible and more forgiving.
Tile: Accent Use Only
Standard floor tiles are not designed for the thermal cycling stress that a masonry heater surface experiences. Tile is appropriate for accents only – a tile inset around the firebox opening, a decorative band above the oven door, or a tile sill on the heated bench. If tiles are used as the primary facing, use soapstone tiles or purpose-made refractory tiles.
Kachelofen and Kakelugn Tile Stoves
For clients who want a heater that is as much a work of art as it is a heating appliance, we build custom tile stoves in both the German and Austrian Kachelofen tradition and the Swedish Kakelugn style. Kachelofen tiles are purpose-made ceramic tiles – typically hollow-backed for thermal performance – available in hand-painted antique reproduction styles, smooth glazed contemporary styles, and everything in between. Contact us to discuss tile options, design possibilities, and pricing.
>> View completed heater gallery
Download Chapter 7 as a PDF for offline reading: Chapter 7 PDF
Download the complete guide (all 11 chapters): Complete Planning Guide PDF
Chapter 8: Code, Clearances, and Building Permits
Building Codes That Apply
ASTM E1602: Standard Guide for Construction of Solid Fuel Burning Masonry Heaters. The primary technical standard for masonry heater construction in North America. Defines construction requirements, clearances, and performance criteria specific to masonry heaters.
International Building Code (IBC) and International Residential Code (IRC): The IBC addresses masonry heaters in Chapter 21. Most states have adopted the IBC or IRC as their base building code. Your local building official has the authority to accept a masonry heater as equivalent to a masonry fireplace for code purposes.
>> IBC 2024 Chapter 21 – Masonry Heaters (external)
>> Full masonry heater building codes page
Clearances to CombustiblesS
The following are minimums required under ASTM E1602. Local codes may require additional clearances. Always verify with your local building official before construction.
Foundation to combustible framing: 2 inches.
Heater facing to combustible walls – sides and back: 4 inches, measured from face of masonry veneer.
Heater facing overhead clearance: 10 inches to combustible ceiling or framing above.
Chimney to combustible framing: 2 inches at ceiling and floor penetrations.
Hearth extension in front of firebox: 16 inches of non-combustible material.
Combustibles in front of firebox door: 48 inches – no combustible materials within 4 feet in front of the door.
Wing walls and partition walls may touch the heater by using metal stud framing with cement board attached directly to the heater face. Note: a combustible wall with non-combustible material applied to its surface without an intervening air space is still considered a combustible wall for clearance purposes.
Insurance and Liability
Contact your homeowner’s insurance carrier before installing a masonry heater. Most major insurers cover them, particularly when installed with a building permit and built to ASTM E1602 standards. When hiring a masonry heater builder or ordering a kit, verify that they carry both general liability insurance and errors and omissions insurance specifically covering masonry heater design and manufacturing.
Solid Rock Masonry Heat carries full insurance including errors and omissions coverage for heater design and manufacturing. We are happy to provide certificates of insurance upon request.
>> Full code and clearance details
Download Chapter 8 as a PDF for offline reading: Chapter 8 PDF
Download the complete guide (all 11 chapters): Complete Planning Guide PDF
Chapter 9: Working With a Builder or Going DIY
Three Paths to a Finished Heater
Path 1 – Full Turn-Key Installation by Solid Rock: For clients in Wisconsin, the Upper Peninsula of Michigan, Minnesota, Idaho, Wyoming, and surrounding areas, we offer full turn-key installation including foundation design assistance, core assembly, chimney system supply and installation, and masonry facing in natural stone or brick. We travel for heater installations throughout the Midwest and western states.
Path 2 – SR Core Kit Plus Local Mason: The most common path for clients outside our immediate installation area. You order an SR Core kit from us and hire a local mason for the foundation work and exterior facing. Our course-by-course assembly instructions are detailed enough that a mason with no previous masonry heater experience can build our core correctly. We provide support by phone and email throughout the build.
Path 3 – DIY Owner-Builder: Masonry heaters are among the most accessible major masonry projects for skilled owner-builders. You do not need to be a professional mason to build a masonry heater core, but you do need patience, attention to detail, and the willingness to follow detailed instructions carefully. The SR Cast Core is the better choice for first-time builders.
Working With Your Local Mason on Heater Facing
Most local masons have not built masonry heater facings before, but the work is well within the skill set of any experienced residential mason. All mortar used in contact with or within 4 inches of the heater facing must be heat-rated refractory mortar – standard Type S or Type N mortar is not appropriate in this zone. The heater core expands and contracts with temperature; expansion joints at specified locations must be maintained. We provide detailed facing installation notes as part of every kit package.
Workshops and Hands-On Training
North House Folk School, Grand Marais, Minnesota: 3 to 4-day hands-on workshops covering core assembly, facing, and chimney connection. Classes have been running since 2010 and are open to both owner-builders and professional masons.
MHA Annual Meeting: The Masonry Heater Association of North America holds its annual meeting each spring and includes hands-on building workshops taught by members. This is the best networking and learning opportunity in the industry.
>> North House Folk School workshop schedule
>> Masonry Heater Association of North America
>> View completed heater gallery
Download Chapter 9 as a PDF for offline reading: Chapter 9 PDF
Download the complete guide (all 11 chapters): Complete Planning Guide PDF
Chapter 10: Frequently Asked Questions
These are the questions we hear most often from people using this masonry heater planning guide to evaluate whether a masonry heater is right for their home.
Why does a masonry heater cost so much more than a wood stove?
A finished masonry heater is not an appliance you buy at a hardware store. It is a custom-built, permanent masonry structure that weighs 6,000 to 12,000 pounds, requires an engineered foundation, and typically takes a skilled mason several days to a week to complete. The better question is: what does it cost over 30 years? A masonry heater is a one-time investment with a lifespan measured in generations. Compare that to a forced-air furnace at $8,000 to $15,000 every 15 to 20 years, plus annual maintenance and fuel costs.
Can a masonry heater heat my whole house?
It depends on your house. A single masonry heater is well-suited to heating an open floor plan home of 1,000 to 2,000 square feet with standard 8-foot ceilings and good insulation. Bedrooms and other closed rooms behind walls will be somewhat cooler – typically 5 to 10 degrees, which many clients find perfectly comfortable for sleeping. For larger homes, two heaters or a heater-plus-in-floor-radiant combination is typically the right answer.
How much wood will I need?
For a reference point: an SR-18 fired once per day at 60 pounds of wood per fire, every day of the heating season, will use approximately one cord of wood per month in a northern Minnesota winter. Most clients in colder climates use 3 to 5 cords per heating season. The single most important factor is wood moisture content – at or below 20 percent. Wet wood burns cooler, produces more smoke, and delivers significantly less usable heat per pound.
How do I control the heat output?
You control output by adjusting the size and frequency of your fuel charge. A smaller fire on a mild day, a larger fire on the coldest days. That is the entire control mechanism. The surface temperature of a masonry heater at full fire is typically between 140 and 180 degrees Fahrenheit – warm but not hot enough to burn you.
Can I install a masonry heater in my existing home?
Yes, in most cases. The primary considerations are floor structure to carry the weight, chimney routing to the exterior, and finding a central location with reasonable radiant exposure to the main living area. Retrofits are more complex and typically more expensive than new construction installations because of the structural work involved, but they are done regularly and successfully. Contact us with your floor plan and we can assess the feasibility quickly.
Does a masonry heater need EPA certification?
No. The US EPA classifies masonry heaters as non-affected facilities – explicitly excluded from certification requirements because the EPA recognized that masonry heaters are inherently clean-burning due to their high combustion temperatures.
What about insurance and permits?
Contact your homeowner’s insurance company before installing a masonry heater. Most major insurers cover them, particularly with a building permit. A building permit is the appropriate mechanism for code compliance – masonry heaters are not UL listed but are built under the masonry fireplace provisions of your local building code.
>> Full code and permit information
How long does a masonry heater fire last?
You load the firebox once with 35 to 65 pounds of dry wood depending on your model. The fire burns completely in 2 to 3 hours. When the coals are fully extinguished, you close the chimney damper. The heat stored in the masonry mass then radiates steadily into your living space for the next 12 to 24 hours.
Do masonry heaters need electricity?
No. Masonry heaters operate entirely without electricity. There are no blowers, ignitors, or controls. This is a meaningful advantage for off-grid applications and rural areas with frequent power outages.
What is the lifespan of a masonry heater?
A well-built masonry heater will outlast you. There are masonry heaters in Europe that have been heating homes continuously for over 100 years. The firebox liner and door are designed to be field-replaceable, but the masonry structure itself is essentially permanent with normal care and proper operation.
What is the difference between a black oven and a white oven?
The black oven is heated directly by combustion gases and reaches higher temperatures quickly, making it suitable for bread, pizza, and roasting. The white oven is heated indirectly through the surrounding masonry and holds a steadier lower temperature for slow baking. Both are integrated into the heater structure and require no separate fire.
>> View completed heater gallery
Download Chapter 10 as a PDF for offline reading: Chapter 10 PDF
Download the complete guide (all 11 chapters): Complete Planning Guide PDF
Chapter 11: SR Products, Services, and 2026 Pricing
2026 SR Hybrid Core Kit Pricing
The Hybrid Core uses approximately 230 firebricks with 18 cast refractory slabs. More economical kit cost with additional build time. Prices include all core materials, SR doors, and full drawing package. Installation is quoted separately.
SR-13H (SR-13 Hybrid, no oven): $7,016
SR-13HBO (SR-13 Hybrid with black oven): $8,175
SR-13HWO (SR-13 Hybrid with white oven): $8,465
SR-18H (SR-18 Hybrid, no oven): $8,769
SR-18HBO (SR-18 Hybrid with black oven): $10,073
SR-18HWO (SR-18 Hybrid with white oven): $10,363
SR-22H (SR-22 Hybrid, no oven): $9,204
SR-22HBO (SR-22 Hybrid with black oven): $10,508
SR-22HWO (SR-22 Hybrid with white oven): $10,798
2026 SR Cast Core Kit Pricing
The Cast Core uses approximately 40 firebricks with 55 precision refractory castings. Fastest to build with minimal cutting. Higher kit cost is typically offset by reduced labor time.
SR-13C (no oven): $9,157
SR-13CBO (with black oven): $10,600
SR-13CWO (with white oven): $10,756
SR-18C (no oven): $11,805
SR-18CBO (with black oven): $12,050
SR-18CWO (with white oven): $12,437
SR-22C (no oven): $12,614
SR-22CBO (with black oven): $13,314
SR-22CWO (with white oven): $13,612
Cook Stove Combinations
SR-13HCH (SR-13 Hybrid with cook top): $7,016
SR-13HCH-BO (with cook top and oven): $8,216
SR-18HCH (SR-18 Hybrid with cook top): $8,769
SR-18HCH-BO (with cook top and oven): $9,969
SR Firebox Doors: 2026 Pricing
All SR doors are fabricated in Duluth, MN using North American refractories and steel with pyroceramic glass sourced from Germany. Includes an air frame supplying 100 percent of required combustion air with proper preheated underfire and overfire air ratios, plus an air wash to keep the glass clean. Allow 6 to 8 weeks lead time on all door orders. Custom door sizes available for masonry heaters, bake ovens, cook stoves, fireplaces, and commercial wood-fired ovens.
SR-13FB (13.25″ x 18.75″ glass): $1,622
SR-18FB (18.25″ x 18.75″ glass): $1,861
SR-22FB (22.25″ x 18.75″ glass): $2,008
SR-28FB (28.25″ x 18.75″ glass): $2,607
SR-32FB (32.25″ x 18.75″ glass): $2,901
Arched top doors: add $135 per door.
Additional Options and Accessories
Heated bench: $250 per linear foot (core materials only; facing by local mason)
SR-CO Cleanout Door with 4″ deep air frame: $143
SR-A Gasketed Ash Door: $315
Design services (2D SketchUp blueprints, 3D elevations, AIA facade design): $200 to $1,500 depending on scope
Total Installed Cost Ranges
Stone masonry heater (Hybrid or Cast Core): $29,500 to $37,000
Brick masonry heater: $25,000 to $33,000
These ranges represent a standard installation including core kit, finish materials, foundation, chimney, and labor. Projects that are significantly larger, require complex foundations, involve remote travel, or include premium finishes will fall outside these ranges. A raised hearth is an optional add-on not included in these ranges.
Shipping
We ship from Duluth, MN to all regions of the United States and Canada. Kit pallets typically weigh up to 2,000 pounds each and ship by freight. Three delivery options: shipping to a local business or hardware store with a forklift (preferred and most economical), shipping to a local freight transfer station for pickup, or shipping direct to your property if you have equipment to handle a 2,000-pound pallet from a semi-truck.
How to Get Started
Tell us about your project: square footage, ceiling height, construction type, location, floor plan if available, and what you are hoping to accomplish. We will identify the right model, configuration, and options for your layout and provide a detailed kit quote covering materials, doors, and shipping. Installation pricing is quoted separately for traveled jobs.
Download the complete 2026 SR Product Guide for full specifications, all model configurations, door pricing, cook stove details, and shipping information.
Contact Solid Rock Masonry Heat
Eric Moshier, Certified Heater Mason
Third-Generation Mason | In Business Since 2003
Fully insured including Errors and Omissions coverage for heater design and manufacturing
5347 Howard Gnesen Road, Duluth, MN 55803
218-343-2978 | eric@solidrockmasonry.com | solidrockmasonry.com
Additional Resources
The following resources complement this masonry heater planning guide.
2026 Solid Rock Masonry Heat Product Guide – Masonry Heater Kits, Doors and Pricing
>> SR masonry heater systems and design
>> Are masonry heaters worth it? Full cost analysis
>> Masonry heater building codes
>> View completed heater gallery
>> Masonry Heater Association of North America
>> MHA Lopez Labs testing archive
>> IBC 2024 Chapter 21 – Masonry Heaters
>> North House Folk School workshops
Download Chapter 11 as a PDF for offline reading: Chapter 11 PDF
Download the complete guide (all 11 chapters): Complete Planning Guide PDF