Pool Heater Cost Ontario 2026: Gas vs Heat Pump vs Solar, and the Real Operating Cost

Natural Gas Pool Heater: Cost and Operating Reality

A natural gas pool heater is the default choice in Ontario for owners who want fast heat recovery and no dependence on outdoor air temperature. A 250,000 to 400,000 BTU unit from Raypak, Hayward, or Pentair costs $2,200 to $3,800 for the equipment alone.[6]Installed cost runs $3,000 to $5,500 once you add a new gas line branch, venting, a condensate drain on high-efficiency models, and the TSSA gas permit.

Operating cost is where the gas heater gets expensive. At current Enbridge Gas rates in Ontario, a 400,000 BTU heater pulling full capacity uses roughly 4 cubic metres of natural gas per hour.[4]See our Enbridge gas rates guide for the detailed rate structure, but a typical pool season break-out looks like this:

Compare those numbers carefully with how you actually use the pool. Many Ontario owners pay for full-season heating but only swim on weekends, which means they are burning gas overnight to hold a temperature they never use. A timer and a pool cover cut this cost in half without touching comfort.

Heat Pump Pool Heater: Cost and Operating Reality

A heat pump pool heater uses the same technology as a cold climate air-source heat pump , just scaled and plumbed for pool water instead of an air handler. A 110,000 to 140,000 BTU unit from Hayward HeatPro, Pentair UltraTemp, or AquaCal costs $3,500 to $5,500 for equipment.[7][8]Installed cost runs $4,500 to $7,000 once you add the pad, water plumbing tie-in, and a new 240V dedicated circuit.

The efficiency story is the selling point. A pool heat pump delivers a Coefficient of Performance (COP) of 5 to 6 at 27 degrees Celsius ambient air, meaning it produces 5 to 6 units of heat for every unit of electricity consumed.[9] That cuts operating cost far below gas for the months when ambient air is warm.

Typical Ontario operating cost for a heat pump running a medium pool during a standard season is $80 to $180 per month, measured at roughly $0.15 to $0.18 per kWh blended Time-of-Use pricing.[5]The unit is most efficient in July and August and least efficient in late September when ambient air starts dropping overnight.

The catch: a heat pump cannot recover pool temperature quickly. Where a gas heater raises water temperature 1 to 2 degrees per hour, a heat pump recovers at roughly 0.25 to 0.5 degrees per hour. That is fine for a pool you maintain at a setpoint, but a pool you let drift cold over a week of cold weather will take days to recover with a heat pump alone.

Solar Pool Heater: Cost and Operating Reality

Solar pool heating is the cheapest energy in Ontario once the system is installed. A rooftop or ground-mounted solar collector array costs $3,000 to $5,000 installed for a typical medium pool, including the collector panels, diverter valve, vacuum relief, controller, and plumbing tie-in.

Collector sizing is driven by pool surface area:

Operating cost is near zero because the existing pool pump is doing all the work, just pushing water through the collectors on sunny days. The added runtime and pressure drop add roughly $10 to $30 per month in pump electricity, nothing else.

The weakness is what it says on the label: solar. On a cloudy week in late May or late September you get almost no heat gain. A solar system paired with a pool cover is the sweet spot for most Ontario owners who want affordable comfort without a $200 monthly gas bill.

Electric Resistance: When It Makes Sense (And When It Does Not)

An electric resistance heater is a simple element heater that dumps electricity directly into water. At an Ontario residential rate of roughly $0.15 per kWh blended across Time-of-Use periods, heating a standard 20,000 gallon pool from 65 to 80 degrees Fahrenheit takes roughly 1,100 kWh, or about $165 per recovery cycle.[5]For a full season, running the numbers typically pushes monthly operating cost past $500.

That cost is why electric resistance heaters are almost never specified for full pools in Ontario. They show up in two narrow situations:

• Small hot tubs and spas where the water volume is 300 to 500 gallons and the insulation is strong, which keeps total runtime low.
• Commercial or indoor pool contexts where a heat pump cannot be vented or a gas line is unavailable, and the operator has commercial electricity pricing.

If a contractor proposes an electric resistance heater for a residential outdoor Ontario pool, ask for the operating cost estimate in writing before signing anything. In almost every case, a heat pump is the right answer instead.

Season Extender vs Full-Season Heating

The honest upfront question for any Ontario pool owner is what season you are actually trying to build:

A solar cover deserves its own mention. A good pool cover alone cuts evaporative heat loss by roughly 50 to 70 percent, and for many Ontario pools it adds more usable days than any active heater. If the budget is tight, buy the cover first and see how far it gets you before committing to an active heater.

Gas Line and TSSA Requirements

Every natural gas pool heater install in Ontario must be done by a TSSA certified gas technician who pulls a fuels safety permit and books the post-install inspection.[2] The permit and inspection are not optional, and a home insurance claim related to an unpermitted gas heater install is routinely denied.

The typical scope includes:

• Sizing the branch gas line to carry 250,000 to 400,000 BTU without starving the existing furnace, water heater, and range. This often means a 3/4 inch line from the meter to the heater location.
• Verifying the meter capacity can supply the combined peak load, including the pool heater firing while the furnace is running on a cool day.
• Installing a proper manual shutoff, sediment trap, and flexible connector at the heater.
• Venting: modern pool heaters use either atmospheric vertical venting or power-vented horizontal vent kits. The clearances to combustibles, windows, and property lines are codified and the TSSA technician confirms them.

If the heater is propane instead of natural gas (common in rural Ontario), our natural gas vs propane guide covers the cost difference in detail. Propane operating cost is roughly 2 to 3 times higher than natural gas for the same BTU, so propane pool heating is niche.

Electrical Requirements for a Heat Pump

A heat pump pool heater is always a dedicated-circuit install. The typical unit draws 40 to 50 amps at 240V under full load, which means a 50 or 60 amp breaker and 6 AWG copper or 4 AWG aluminum cable depending on the run length.[3]

Before the contractor quotes the heat pump, check:

• Available panel capacity. A 100 amp service that already runs a range, dryer, and central air may not have room for a 50 amp pool heater circuit without a panel upgrade.
• Distance from the panel to the pool pad. Long runs (over 100 feet) need larger gauge cable to hold voltage drop within code.
• Outdoor disconnect. The Canadian Electrical Code requires a visible disconnect within sight of the heat pump for servicing.[3]
• GFCI protection. Pool-area electrical equipment is held to strict ground-fault rules under the Ontario Electrical Safety Code.

The ESA permit fee is typically $100 to $200 and the inspection is usually included in the electrician's quote. A panel upgrade, if required, runs $1,500 to $3,500 on top of the heat pump install, which is worth flagging before the equipment gets ordered.

Pool Cover: The Missing Variable

Nothing in this guide matters more than whether you use a pool cover overnight. Evaporation is the single largest source of heat loss from an outdoor pool, and a good solar or thermal cover cuts it dramatically. For any of the three main heater types, a cover is the cheapest efficiency upgrade available.

• Solar bubble cover: $150 to $400 depending on size, lasts 3 to 5 seasons.
• Automatic retractable cover: $8,000 to $18,000 installed, lasts 10 to 15 years, dramatic heat and evaporation savings.
• Liquid solar cover: $50 to $100 per season, works in the skimmer, no physical cover to handle. Lower effectiveness than a physical cover but zero hassle.

The Bottom Line for Ontario Pool Owners

If you want weather-independent, fast, on-demand heat and you are prepared for $100 to $300 monthly gas bills during the season, natural gas is the right answer at $3,000 to $5,500 installed. If you are on Time-of-Use or Ultra-Low Overnight electricity and willing to heat the pool during warm shoulder weather only, a heat pump at $4,500 to $7,000 installed will cut your operating cost by roughly two-thirds over 10 years. If your roof has good southern exposure and your priority is the cheapest possible operating cost, solar at $3,000 to $5,000 is unbeatable, with the caveat that cloudy weather means cool water.

Whichever heater you pick, a cover is not optional. It is the cheapest BTU you will ever buy.

Frequently Asked Questions