Installing a masonry heater kit comes down to three things: assembling the heater body, connecting the chimney, and getting the finished installation inspected so your insurer is satisfied. The first is straightforward DIY. The second you can do yourself or hire out. The third, a WETT inspection, is the piece most Canadian homeowners overlook until their insurance company asks for it. This guide walks all three in order, plus permits and the floor question underneath everything.
Step 1: Assemble the heater body (1 to 3 days)
This is the part that used to require a master mason and now doesn't. The kit arrives as precut, numbered brick and stone with all the metal parts and supply materials, plus a printed manual and video. You lay it up in order, following the numbers. Most people finish in one to three days depending on the model.
You don't need masonry experience. You need patience, a level, the ability to follow a manual step by step, and a helper for the heavier pieces. If you can tile a bathroom or build flat-pack furniture carefully, you can assemble one of these.
What matters most at this stage: assemble in strict adherence to your local building code. That single condition is what keeps your installation insurable later, so it's worth reading your municipality's requirements before you start rather than after.
Step 2: Connect the chimney (DIY or hired, your call)
The chimney is where projects split. Two honest paths:
You already have a sound chimney. Connecting a new masonry heater to an existing, good-condition chimney is the simpler, cheaper case. Confirm the flue is the right size and in good repair, and the connection is a manageable job.
You need a new chimney, or yours needs work. This is the more involved path, and cost varies widely by region and by what your building needs. You can do this as a DIY project too, but if you're not confident working with flue systems, this is the natural place to bring in a professional.
Either way, the chimney connection is not the step to rush or guess at. A wood-burning appliance vents combustion gases; the flue has to be right. If you do it yourself, Step 3 is how you confirm you did it correctly.
Step 3: The WETT inspection (this is the important one)
WETT stands for Wood Energy Technology Transfer. A WETT-certified inspector surveys your finished masonry heater and chimney and confirms the whole installation complies with local building codes and fire regulations.
Here's why it matters more than most people expect: in Canada, your home insurance for a wood-burning installation typically depends on it. Insurers want proof the heater and chimney were done to standard. There are two ways to satisfy them:
You hired a certified professional to install the heater and chimney: their certification is usually the documentation your insurer needs.
You assembled the heater and connected the chimney yourself: you invite a WETT-certified inspector once the project is complete. Their survey is your proof of compliance.
So DIY assembly does not disqualify you from insurance. It just means the WETT inspection is the checkpoint that stands in for a contractor's certification. Book it as soon as the installation is finished; don't light a serious fire in a heater your insurer hasn't been given reason to cover.
The floor question, before you order anything
A masonry heater is heavy, several hundred kilograms concentrated on a base under a metre across. Where it stands decides whether you need extra work:
Ground-floor concrete slab: usually fine as-is.
Suspended wood floor: may need reinforcement designed for the load. This is a real line item, and it's cheaper to plan for it before the pallet arrives than to discover it after.
If you're unsure whether your floor can carry the model you want, ask us before ordering; matching the heater to your building is part of choosing the right kit in the first place.
Permits
Municipal requirements for installing a wood-burning appliance vary across Canada. Some areas require a permit, some don't. Check with your municipality before you order rather than after you've assembled, so there are no surprises when the inspection happens.
Frequently asked questions
Do I need a professional to install a masonry heater kit?
No, though you can hire one. The heater body is designed for DIY assembly from precut, numbered parts. You can also connect the chimney yourself; if you do, a WETT-certified inspector surveys the finished work so your installation stays insurable.
What is a WETT inspection and do I need one?
WETT (Wood Energy Technology Transfer) is a certified inspection of a wood-burning heater and chimney confirming they meet local building and fire codes. In Canada, your home insurer will typically require proof of compliance, and a WETT inspection is how DIY installers provide it.
Can I connect the chimney myself?
Yes. Chimney connection can be a DIY project, especially when you have a sound existing chimney. If you're building a new chimney or aren't confident with flue systems, hire a professional. Either way, a WETT inspection confirms the finished installation is compliant.
Will my insurance cover a self-installed masonry heater?
Typically yes, provided the heater was assembled to your local building code and a WETT-certified inspector has surveyed the finished heater and chimney. That inspection is the documentation insurers ask for when you install it yourself.
Does my floor need reinforcement?
A ground-floor concrete slab usually carries a masonry heater as-is. A suspended wood floor may need reinforcement for the load. Check before ordering, and ask us if you're unsure which model your floor can support.
Ready to plan your install?
See the full lineup with CAD prices and heating areas: browse the masonry heater kits, or read the complete cost guide for the full budget including inspection and freight. Questions about your specific space? Ask us; sizing and install advice is free.
Sources
- WETT Inc. (Wood Energy Technology Transfer): wettinc.ca
- Masonry Heater Association of North America: masonryheaterassociation.org
- Assembly, chimney and insurance conditions: Canada Masonry Heater Kits product and FAQ pages, July 2026.
Related reading: the full cost guide, the sauna heater sizing guide, masonry heater permits by province, wood heat and home insurance, and why a masonry heater beats a metal stove.
