How much does it cost to run a pool heat pump per month in Ottawa?

Running a pool heat pump in Ottawa costs approximately $100 to $300 per month during the swimming season, depending on your pool size, target water temperature, ambient air temperatures, and whether you use a solar cover — with most standard residential pools (60,000 to 100,000 litres) falling in the $150 to $250 per month range when maintaining a comfortable 26 to 28°C water temperature. This represents roughly one-quarter to one-fifth the monthly cost of heating the same pool with a natural gas heater.

The monthly operating cost of a pool heat pump is driven by a straightforward equation: how much heat the pool loses each day determines how much heat the pump must replace. In Ottawa's climate, a pool loses heat through four main pathways — evaporation from the water surface (the largest factor, accounting for 50 to 70 percent of total heat loss), radiation to the cooler night sky, conduction through the pool walls into the surrounding soil, and convection from wind blowing across the water surface. Ottawa's specific conditions — relatively low humidity, cool overnight temperatures, and occasional strong winds from the Ottawa River valley — create higher heat loss rates than pools in southern Ontario or coastal British Columbia.

Breaking down the monthly cost by Ottawa's swimming season months reveals significant variation. In June, when daytime highs average 24°C and overnight lows average 12°C, the heat pump works harder to maintain pool temperature, running 8 to 12 hours daily. At Hydro Ottawa's blended residential rate of approximately $0.10 to $0.13 per kilowatt-hour, a typical 120,000 BTU heat pump drawing 5.5 to 6.5 kW consumes roughly $150 to $280 in electricity for the month. In July and August, when ambient temperatures are higher and closer to the pool's target temperature, the heat pump runs less — perhaps 4 to 8 hours daily — and monthly costs drop to $80 to $200. In September, as temperatures fall and nights cool, costs climb back toward June levels at $140 to $260 per month.

Hydro Ottawa's time-of-use pricing structure significantly affects your monthly heat pump cost, and smart programming can reduce your bill by 20 to 30 percent. The current rate tiers charge the highest prices during on-peak hours (weekday afternoons) and the lowest during off-peak hours (evenings, overnight, and weekends). Programming your heat pump to run primarily during off-peak hours — which is feasible because pool water retains heat well and the temperature only needs maintaining, not constantly raising — shifts the majority of your electricity consumption to the cheapest rate. A pool heat pump timer or automation system that starts the heat pump at 7:00 PM and runs it through the overnight off-peak period can reduce monthly electricity costs from $200 to around $140 for a typical mid-size Ottawa pool.

Using a solar cover (also called a solar blanket) is the single most effective way to reduce monthly heat pump operating costs in Ottawa. A solar cover reduces overnight heat loss by 50 to 70 percent by blocking evaporation, trapping radiated heat, and shielding the water from wind. For an Ottawa pool heated to 27°C, adding a solar cover can reduce the heat pump's daily runtime by 3 to 5 hours, translating to monthly savings of $40 to $100. A quality solar cover for a standard residential pool costs $100 to $300 and lasts 3 to 5 Ottawa seasons before UV degradation requires replacement. The cost of the cover is recovered within the first month or two of reduced heat pump electricity consumption.

Pool size is the most significant variable in monthly operating cost because larger pools have more surface area for heat loss and more water volume to maintain at temperature. A smaller urban pool of 40,000 to 50,000 litres — common in Ottawa's older neighbourhoods like the Glebe, Westboro, and Alta Vista — might cost $80 to $150 per month to heat with a properly sized heat pump. A mid-size suburban pool of 70,000 to 90,000 litres in Barrhaven, Kanata, or Orleans typically costs $150 to $250 per month. A large pool of 100,000 litres or more on a Manotick or Stittsville estate property can cost $250 to $350 per month during cooler shoulder months.

Your target water temperature has a disproportionate impact on monthly cost. Each additional degree of water temperature above the natural equilibrium temperature (the temperature the pool would reach without heating) requires progressively more energy to maintain because heat loss increases with the temperature differential between the pool and the ambient air. In practical terms, maintaining an Ottawa pool at 25°C in July might cost $60 to $100 per month, while maintaining the same pool at 28°C costs $120 to $200 — roughly double for just 3 degrees of additional warmth. Maintaining 30°C or above is extremely expensive with a heat pump in Ottawa's climate, potentially exceeding $300 to $400 per month, and a gas heater becomes more practical at these elevated temperatures.

Wind exposure at your specific Ottawa property dramatically affects monthly heat pump costs, and this factor is often underestimated. Pools in exposed locations — hilltop properties in Stittsville, open subdivision lots in Riverside South, or river-adjacent properties along the Rideau or Ottawa rivers — experience substantially higher evaporative heat loss due to wind. A privacy fence, hedge row, or purpose-built wind screen on the prevailing wind side of the pool can reduce wind-driven heat loss by 30 to 50 percent, potentially saving $30 to $80 per month in heat pump operating costs. The investment in a 6-foot privacy fence or cedar hedge — which Ottawa zoning by-laws permit in rear yards — provides both wind protection and visual privacy.

Comparing your monthly heat pump cost to the alternatives puts the numbers in perspective. A natural gas heater maintaining the same pool at the same temperature costs approximately $400 to $750 per month with Enbridge's current Ottawa rates. A propane heater costs even more — $600 to $1,000 per month — due to propane's higher per-BTU cost. An unheated pool costs nothing but limits comfortable swimming to approximately July 1 through Labour Day in most Ottawa seasons. The heat pump occupies the middle ground: affordable enough to run daily throughout the extended season, effective enough to maintain comfortable temperatures during most of the May-to-October window, with the primary limitation being reduced performance during the coldest shoulder weeks.

Curious about the exact monthly cost of heating your specific Ottawa pool? Ottawa Pool Installation connects homeowners with heat pump specialists who can calculate projected operating costs based on your pool's size, location, wind exposure, and temperature preferences.