How Much Does It Cost to Run a Pool Pump?
A standard single-speed 1.5 HP pool pump (about 2,000 watts) running 8 hours a day costs roughly $2.08 per day, or about $62.40 per month, at the U.S. average electricity rate of 13¢/kWh. Over a 6-month pool season, that's around $374 — making the pump one of the biggest single electricity draws in a home with a pool, often second only to HVAC.
Variable-speed pumps change this equation significantly. Instead of running a large motor at full power for a fixed number of hours, they run at a much lower wattage (often 300-500W) for the same or longer duration, since slower flow still achieves full water turnover — just over more hours. Because power draw drops roughly with the cube of speed, cutting pump speed in half can cut power use by up to 85%, even though runtime may increase.
Pool Pump Cost by Type
Estimated cost running 8 hours/day at 13¢/kWh:
- Single-speed, 1 HP (~1,500W): ~$1.56/day · ~$46.80/month
- Single-speed, 1.5 HP (~2,000W): ~$2.08/day · ~$62.40/month
- Single-speed, 2 HP (~2,500W): ~$2.60/day · ~$78/month
- Variable-speed, typical low setting (~400W): ~$0.42/day · ~$12.48/month
How Many Hours Should a Pool Pump Run?
Most pools need one full water turnover per day to stay clean and properly filtered. For a single-speed pump, that typically means 6-8 hours of runtime. Hot climates, heavily used pools, and pools with lots of debris (trees, high traffic) may need 10-12 hours. Variable-speed pumps are often set to run longer — even 24 hours a day at very low speed — because the wattage is so much lower that extended runtime still costs less than a few hours of a single-speed pump at full power.
What Affects Pool Pump Running Cost
- Pump horsepower and type: Single-speed pumps use 1,500-2,500W at full power. Variable and dual-speed pumps can drop to 200-500W at low settings.
- Pool size: Larger pools need more turnover volume, generally requiring longer runtime to fully circulate the water once a day.
- Filter type and condition: A clogged filter increases the pump's workload and can extend runtime needed to maintain water clarity.
- Climate: Hot, sunny climates promote faster algae growth, often requiring longer daily runtime than cooler, shadier locations.
- Time-of-use electricity rates: Running the pump during off-peak hours (typically overnight) can cut the effective cost per kWh by 30-50% on time-of-use plans.
Single-Speed vs. Variable-Speed: Is the Upgrade Worth It?
A variable-speed pump typically costs $200-$400 more upfront than a comparable single-speed pump but can cut annual pump electricity costs by 50-80%. For a pool owner spending $350-$450/season on a single-speed pump, switching to variable-speed often saves $250-$350/season — meaning the extra upfront cost is usually recovered within one to two pool seasons, after which it's pure savings for the life of the pump.
Tips to Lower Pool Pump Running Cost
- Run during off-peak hours if your utility offers time-of-use rates — pumps don't care what time of day they circulate water.
- Reduce runtime gradually and monitor water clarity — many pools are over-filtered running 10+ hours when 6-8 would suffice.
- Clean the filter and skimmer baskets regularly — a clogged system makes the pump work harder for the same result.
- Use a pool cover to reduce debris and evaporation, which can reduce required filtration and heating runtime.
- Consider a variable-speed pump on your next replacement — the energy savings alone often justify the higher purchase price.
For related running-cost calculators, see our Appliance Energy Cost Calculator or check out our Solar Panel Savings Calculator to see if solar could offset pool pump electricity use.