Radiant Floor Heating Ontario 2026: Electric vs Hydronic, Retrofit vs New Build, and Real Costs

Electric vs Hydronic Radiant: The Basics

There are two fundamentally different ways to heat a floor in Ontario, and mixing them up is the most common mistake homeowners make when they start pricing the job.

Electric radiant uses a mat or cable set in thinset mortar or a membrane like Schluter DITRA-HEAT below the finished floor. A thermostat with a floor sensor controls the temperature. Power comes from a dedicated 120V or 240V circuit. The mat heats directly, the floor warms in about 30 to 60 minutes, and you can zone each room independently with its own thermostat. Manufacturers like Warmup and Schluter publish detailed specs for residential mats, sensor placement, and membrane build-ups that Ontario electricians and tile setters follow.[5][6]

Hydronic radiant uses cross-linked polyethylene tubing (PEX) embedded in a concrete slab, a thin lightweight slab on top of the subfloor, aluminum transfer plates between joists, or a pre-grooved panel system. Warm water from a boiler or heat pump flows through the tubing, heats the floor mass, and the floor radiates to the room. Uponor's residential design guide is the reference most Ontario hydronic contractors use for tubing spacing, manifold sizing, and supply-temperature planning.[4]

The summary: electric is simple and cheap to install in small rooms and expensive to run if you use it as primary heat over a large area. Hydronic is expensive to install but cheap to run and pairs naturally with central heat sources that can modulate output, like condensing boilers or heat pumps.

Install Cost Ranges: $10 to $25 per Square Foot

Here is what Ontario homeowners actually pay in 2026, broken down by system type. These ranges assume a renovation or new construction context where the floor is already open and the finished flooring is being installed new.

These numbers are the radiant system itself: tubing or mats, controls, thermostats, manifolds, installation labour, and finished floor prep. They do NOT include the heat source for hydronic, which is a separate line item that can easily add $8,000 to $25,000 depending on whether you choose a gas boiler, condensing boiler, or heat pump. They also do not include the finished floor covering itself (tile, engineered hardwood, polished concrete), which you would be paying for anyway.

Retrofit on an Existing Floor: Very Limited

The single biggest constraint in Ontario radiant retrofit is that you almost always have to tear up the floor to install it. There is no practical way to slide a mat or tubing under an existing finished floor without removing the floor first.

The retrofit scenarios that actually work in practice:

• Bathroom renovation. You are tearing out the tile anyway. An electric mat goes in during the tile rough-in with essentially no extra time. This is the highest-value retrofit because the incremental cost is low.
• Basement finish. A bare concrete slab is an ideal substrate for either electric mats under engineered flooring or hydronic tubing laid in a thin slab topping. If you are finishing a basement, this is the right window to add radiant.
• Kitchen or main floor renovation. If existing flooring is coming up and new subfloor prep is happening, electric mats or a hydronic panel system can go in. The panel system raises the floor height by about an inch, which matters for door clearances and stair transitions.
• Joist bay retrofit from below. If the basement ceiling is unfinished, hydronic tubing can go between the joists with aluminum transfer plates, heating the main floor from underneath. This is the only retrofit path that does not require tearing up the finished floor above, but it requires a heated water supply (boiler or heat pump), a circulation pump, and insulation below the tubing.

What does not work: adding radiant under a hardwood floor that is staying in place; installing electric radiant in a finished concrete slab without overlay; retrofitting hydronic above an existing main floor without raising the floor height and adjusting every doorway. Contractors who promise a magic retrofit without removing the floor are either misunderstanding the product or about to break something.

New Construction Install

New construction is where radiant shines, because the incremental cost over conventional heating is the smallest and the build-up is designed into the structure from the start. Natural Resources Canada's heat pump guidance explicitly flags low-temperature distribution systems as a best-fit for modern heat pump installations, and radiant is the canonical low-temperature distribution.[1]

In a typical Ontario new build, hydronic radiant on the main floor pairs with either a condensing gas boiler, an air-to- water heat pump, or a ground-source heat pump. The tubing is either embedded in the basement slab (heating the basement and radiating up), in a lightweight slab topping over the main floor subfloor, or in pre-engineered panels under engineered hardwood. Upstairs bedrooms often get electric mats in the bathrooms only, with the main heating handled by a different system (ducted heat pump, baseboards, or forced air).

CHBA's Net Zero Home program guidance, which many Ontario custom builders now follow as a quality benchmark, treats radiant floor distribution as one of the acceptable primary distribution systems when paired with a high-efficiency heat source.[3] That matters because radiant used to be seen as a luxury add-on; today, in a high-performance envelope with a heat pump, it is often the most efficient distribution choice.

Compatibility With Low-Temperature Heat Pumps

This is the section to pay attention to if you are building new or planning a deep retrofit. Radiant + heat pump is becoming a default pairing for a specific reason: they operate in the same temperature band.

Conventional boilers deliver supply water at 60 to 80 degrees Celsius. Hydronic radiant only needs 35 to 45 degrees to maintain comfortable floor temperatures. Running a hot boiler with mixing valves to drop the temperature for the floor is legal and common, but it wastes the boiler's efficiency advantage.

Air-to-water heat pumps and ground-source heat pumps deliver their best coefficient of performance at exactly the supply temperatures radiant wants. NRCan's household heating guidance highlights that distribution temperature is one of the biggest levers on heat pump efficiency, and lower is better.[2] Feed a heat pump into a radiant floor and you get the full efficiency of the heat pump, comfortable floors, and no mixing losses.

The emerging Ontario combination, especially in custom builds and net-zero-targeted retrofits, looks like this:

• Air-to-water heat pump (outdoor unit, typically 3 to 5 tons for a detached home): $18,000 to $30,000 installed.
• Indoor buffer tank, controls, and hydronic manifolds: $4,000 to $8,000.
• Whole-home radiant distribution (main floor and basement): $30,000 to $45,000 depending on area and build-up method.
• Backup electric resistance element in the buffer tank or a small gas boiler for coldest-day supplement: $1,500 to $5,000.

Total project: $55,000 to $90,000 for a system that heats a 2,000 to 2,500 sq ft home without fossil fuel combustion at the distribution level. Not cheap, but eligible for federal and Ontario heat pump incentive programs and with long-term operating costs substantially below a natural gas forced-air system at current Ontario gas and electricity rates.

Typical Bathroom Room-Level Install: $2,500 to $6,000

The most common radiant project in Ontario is a single bathroom during a renovation. The numbers are tight enough that this is worth breaking out on its own.

A typical 40 to 60 square foot bathroom installs for $2,500 to $6,000 all in. The components:

• Electric radiant mat or cable kit: $400 to $1,200.
• Thermostat with floor sensor (programmable or smart): $150 to $350.
• Dedicated 120V or 240V electrical circuit from the panel, permit, and rough-in: $500 to $1,500 depending on distance and panel capacity.
• Installation labour for the mat (usually handled by the tile setter or a dedicated radiant installer): $400 to $1,000.
• Uncoupling and heat membrane if used (Schluter DITRA-HEAT or similar): $200 to $500.

The range is driven mostly by how far the new circuit has to run and whether the installer is handling both the heating and the tile. If your electrician and tile setter are different trades on different days, there is some coordination overhead that can push the total up. ESA permits on the electrical side are mandatory and your electrician should be pulling one as part of the bathroom rough-in.[8]

Hydronic radiant in a single bathroom is almost never the right call. You would need a heat source, a pump, a manifold, and controls to heat 50 square feet of floor, and the fixed costs of those components swamp the savings on operating cost. Electric mats are the default for room-level retrofit. The one exception: if you are already installing a whole-home hydronic system, adding the bathroom floor as another zone costs only the tubing and labour for that room.

Operating Cost Comparison

Operating cost depends on the heat source, the insulation level of the house, and how you use the system. Rough Ontario 2026 numbers:

• Electric radiant as supplemental bathroom heat:$5 to $15 per month in a typical GTA home if you run it 3 to 4 hours a day in winter.
• Electric radiant as primary heat for a large area:impractical on retail Ontario electricity rates. You can do the math, but a 1,000 sq ft area drawing 10 to 12 watts per square foot at design day runs at the worst possible time-of-use pricing for hours at a stretch.
• Hydronic radiant with condensing gas boiler:typically 10 to 20 percent lower bills than a comparable forced-air gas furnace in the same house because of the comfort premium (you can set the thermostat 1 to 2 degrees cooler) and the low return-water temperatures that let the boiler stay in condensing mode.
• Hydronic radiant with air-to-water heat pump:30 to 60 percent below a gas forced-air baseline depending on coldest-day design, house envelope, and electricity versus gas pricing. This is the combination NRCan explicitly recommends for new builds and deep retrofits.[1]

The operating-cost story is the reason hydronic + heat pump has moved from a niche choice to a mainstream one in Ontario custom building. The install cost is high, but the lifetime operating cost is the lowest of any electrified heating option available today.

Permits, Code, and Inspections

Radiant work in Ontario is regulated at several levels and the permits vary by system type.

Electric radiant requires an Electrical Safety Authority permit under the Ontario Electrical Safety Code. The electrician pulls the permit, the installation is inspected, and the mat must be on a dedicated circuit with appropriate ground-fault protection. CSA C22.2 No. 46 covers the construction and performance requirements for the heating elements themselves, and ESA inspectors verify compliance at rough-in.[7][8]

Hydronic radiant tied to a new or modified heat source falls under the Ontario Building Code (mechanical and plumbing sections), and gas-fired boilers additionally require a TSSA-certified gas fitter and gas permit.[9] If you are doing a whole-home retrofit, expect at least three permits (electrical, plumbing, mechanical, possibly gas) and a structural review if the floor build-up changes or if you are adding a lightweight concrete pour over existing joists.

Do not let a contractor talk you out of permits. The permit cost is a rounding error on a $30,000 job, the inspection protects your insurance coverage if anything fails, and the paper trail follows the house at resale.

Common Mistakes to Avoid

A few recurring patterns that cost Ontario homeowners money:

• Installing electric radiant as primary heat over a large area.It works, it is comfortable, and your operating bill will be a shock. Electric radiant as a comfort feature in 50 to 200 sq ft is fine. Electric radiant heating a 1,500 sq ft main floor on Ontario time-of-use rates is not.
• Pairing hydronic radiant with a conventional non-condensing boiler.You lose the low-return-temperature efficiency advantage and end up with a mediocre system. If you are installing hydronic, pair it with a condensing boiler or a heat pump.
• Skipping floor insulation below the tubing.Uninsulated hydronic radiant heats the basement or the ground instead of the room above it. Always insulate below the radiant layer.
• Using the wrong finished floor. Solid hardwood on top of radiant can cup, gap, or crack if the wood moisture content or tubing temperature is not controlled. Engineered hardwood, tile, and luxury vinyl are the safe choices. Talk to the flooring manufacturer before committing.
• Zoning the system incorrectly. One thermostat for a whole main floor is a disaster if the house has sunny south rooms and shaded north rooms. Budget for separate zones for each major area or expect overheating and cold spots.

Related Guides

• Bathroom Renovation Cost Ontario (the context most radiant jobs live in)
• Heat Pump with Radiators Ontario 2026 (the related low-temp hydronic retrofit story)
• Basement Finishing HVAC Ontario 2026 (the slab-embedded radiant opportunity)
• Heat Pump vs Furnace Ontario
• Geothermal Heat Pump Cost Ontario
• HVAC Permits Ontario 2026

Frequently Asked Questions