Pool Heaters for Sale in Canada

A well-heated pool dramatically enhances your swimming experience and extends your swim season—sometimes year-round, depending on your location. In Canada’s diverse climate, choosing the right heating technology can make the difference between a short summer splash and months of enjoyment. The four most common residential pool heaters are gas heaters and heat pumps, electric heaters, and solar heaters. Each solution can keep your pool warm, but it comes with distinct benefits and drawbacks.

We strongly recommend having a certified pool professional perform a sizing analysis to ensure you get the right pool heater that is appropriately matched to your pool, weather conditions, and local pool laws and regulations.

Gas Pool Heaters

Gas-operated heaters remain one of the most popular and even traditional pool heating options in Canada, especially in regions with cooler temperatures or where fast heating is a priority. These systems operate by burning either natural gas or propane in a combustion chamber. As water from the pool circulates through the heater, it absorbs the generated heat and returns to the pool at a higher temperature.

Gas swimming pool heaters don’t rely on air temperature or sunlight, making them highly reliable in any weather and ideal for quick, on-demand heating.

Modern pool products are far more efficient than older models, with electronic ignition systems and microprocessor controls offering better reliability and ease of use. Electronic models are now preferred over millivolt (standing pilot) systems due to improved energy efficiency and reduced emissions even in larger inground pools. For those in higher altitudes or environmentally sensitive regions, Low NOx models are available, producing lower emissions and heating the pool water better under varying oxygen levels.

Heat Pumps

Heat pumps are a popular alternative to gas, particularly in southern Canada, where milder temperatures support their energy-efficient operation. These systems extract heat from the surrounding air and transfer it into the water using a refrigerant-based system and a heat exchanger, much like a reverse air conditioner. This process is not only more energy-efficient but also produces zero emissions, making it a cleaner and more environmentally conscious choice.

Although they don’t heat as quickly as gas-operated models, they offer consistent, steady heating at a significantly lower cost over time.

Heat pumps function best when the outdoor temperature is above 10–12°C (50–55°F), as they rely on warm air to operate efficiently. In warm or moderate climates, they can maintain a comfortable water temperature throughout the swimming season. Some high-end models even offer cooling capabilities, making them ideal for hot summers where a refreshing dip is just as important as warmth.

Heat pumps have higher upfront costs than gas heating systems, but their ongoing operational expenses are significantly lower. You can expect savings of up to 80% compared to propane heaters and between 50% to 70% compared to natural gas systems. Over time, these savings often offset the initial investment, especially given that heat pumps can last 10 to 20 years with proper care.

Electric Pool Heaters

Electric resistance pool heaters feature a straightforward technology to increase your pool temperature. These systems pass water over a heating element, which transfers heat directly into the water before recirculating it back into the pool. Electric pool heater is the perfect solution for compact pools and spas since it doesn’t rely on combustion or moving air and operates quietly, while producing no emissions.

While these heaters can technically be used in larger pools, they are far more effective and cost-efficient in smaller-scale applications. Their relatively slower heating capacity and higher electricity demands mean they are generally not the best choice for large pools where quick or sustained heating is required.

Because they depend entirely on electricity, the cost-effectiveness of running one will vary depending on local hydro rates. If you reside in an area where electricity is competitively priced and used during off-peak hours, electricity-operated heaters offer a smart and eco-conscious solution for your pool.

Solar Pool Heaters

Solar pool heaters use renewable energy from the sun to heat your pool water, making them the most environmentally friendly and cost-effective option in the long run. The system circulates water through solar collectors typically installed on a roof or rack, where it is warmed by the sun before being returned to the pool. Some heaters are equipped with automated sensors and control valves, which manage the flow based on temperature differences.

Solar heaters are a popular choice for sunny areas and warmer months, but can still function effectively in less-than-ideal conditions with the right design and placement.

Solar pool heaters have no fuel costs and very low operational expenses, making them the most economical choice over the long run. While they typically have a higher initial cost than gas-operated heaters, they last 15–20 years with minimal maintenance and virtually no ongoing cost. Plus, in warmer climates, they can also be used to cool the pool by circulating water through the panels at night.

Installation and Maintenance

Proper installation is crucial to the performance, safety, and longevity of any above ground and inground pool heater.

• Gas heaters must be installed by a licensed gas technician and should only be used indoors if they are certified for residential indoor use with proper ventilation.

• Electric heaters operate effectively in smaller residential pool projects, and their installation requires electrical work by a qualified professional.

• Heat pumps require professional electrical installation and adequate airflow around the unit for proper heat exchange.

• Solar systems must be installed with careful attention to collector placement, tilt, and plumbing. Hiring a certified solar contractor ensures optimal results.

Routine maintenance varies by the type of pool heater. Most require at least annual servicing. Gas units may need burner cleaning or scale removal. Heat pumps may require refrigerant inspections and airflow checks. Solar systems typically need occasional inspection for leaks or blockages, but little else.

Final Considerations

Each heating system has strengths and weaknesses that suit different pool needs:

• Choose a gas pool solution if you need fast heating in any weather or use your pool infrequently.

• Choose an electric heater if you have a smaller pool and access to affordable electricity.

• Choose a heat pump if you're looking for consistent, energy-efficient heating during the warmer months and are willing to pay more upfront.

• Choose a solar system if you want the lowest operating costs and have good solar access, particularly in southern or sunny parts of Canada.

Consulting a professional installer can help you choose the right heater based on your climate, usage habits, and budget, and ensure it’s installed safely and correctly for efficient heating and a perfect spa like experience.