How many watts does a pool pump use?
A modern variable-speed pool pump filters at about 120 watts and ramps to about 740 watts for cleaning. An older single-speed pump runs at about 900 watts and up — the entire time it is on.
That gap is the whole answer. A pool pump is often the largest single load in a house, and how many watts it uses depends almost entirely on whether it can slow down for the job that fills most of its hours: filtering.
- How much electricity does a pool pump use per hour?
- Between 118 and 742 watts while running, so roughly 0.43 kWh an hour at the middle of that range. At 53¢ per kWh that is about 23¢ an hour.
- How much electricity does a pool pump use in 24 hours?
- Left on for a full 24 hours it uses about 10.32 kWh. That is a different question from a typical day, which for most households is far fewer hours — the two answers differ by several times.
- How much electricity does a pool pump use when off?
- On standby it draws 3 to 6 watts. Small per hour, but it runs every hour of the year, which is why standby is worth counting separately from use.
Work it out with your own tariff
Residential sector, US average, as published in Electric Power Monthly released 26 August 2026. This is a revenue-weighted average across all residential customers and utilities, not a tariff any single household pays. In the same month the state residential averages (table 5.6.A) ran from 14.37 cents in Idaho to 52.72 in Hawaii, with California at 34.74 and New York at 29.49 — a spread of more than three and a half times. Use the figure from your own bill; the default here is a placeholder, not an answer.
| Period | Electricity | Cost | Hours counted |
|---|---|---|---|
| One hour running | 0.43 kWh | $0.23 | 1 hour |
| A full 24 hours on | 10.3 kWh | $5.47 | 24 hours |
| A day of typical use | 0.86 kWh | $0.46 | 2 hours |
| A month | 25.8 kWh | $14 | 2 h/day × 30 |
| A year | 314 kWh | $166 | 2 h/day × 365 |
430 W × 2 h ÷ 1000 = 0.86 kWh × 53¢ = $0.46 for a day of typical use.
Calculated at 430 W, the middle of the 118–742 W range. Rate defaults to 18.34¢ (U.S. Energy Information Administration, June 2026) — a national average, which is wrong for you specifically, so put your own in above.
A pump has two jobs, and they are not the same wattage
Medians across 423 pool pumps certified by ENERGY STAR, measured under the DOE procedure.
| Running at | Median draw | Middle half of models |
|---|---|---|
| Filtering, low speed | 118 W | 87-129 W |
| High speed, cleaning and high flow | 742 W | 545-1,011 W |
| Standby | 4 W | 3-6 W |
Filtering is where the hours go — a pool's water is turned over slowly, for many hours a day. Cleaning and high-flow jobs are brief. The number that decides the bill is the first row, not the second, and it is the one almost nobody quotes.
The old pumps run at high speed all the time, because they cannot do otherwise
Nine in ten certified pumps are variable-speed, and that is not a coincidence: a single-speed pump has one setting, and across the certified single-speed models that setting is about 900 watts — held for every hour the pump runs, filtering included. Older uncertified single-speed pumps draw more still.
The physics is why it matters. A pump's power rises with roughly the cube of its speed, while the water it moves rises only with the speed. Slow the pump by half and it draws about an eighth of the power; run it a little longer to move the same water, and the energy still collapses. A variable-speed pump filtering at 120 watts is doing the same job a single-speed does at 900 — that is the affinity law showing up as a number on a certificate.
What the difference costs over a year
At 18.34 cents a kilowatt-hour, eight hours a day.
| Pump and job | A year | Cost |
|---|---|---|
| Variable-speed, filtering (118 W) | 345 kWh | about $63 |
| Single-speed (900 W) | 2,628 kWh | about $480 |
| Variable-speed, high speed (742 W) | 2,167 kWh | about $400 |
A variable-speed pump spends most of its hours in the first row and only minutes in the third. A single-speed pump has no first row — it is in the middle one whenever it is on. That is the roughly $400 a year the U.S. efficiency standard was written to capture, and it is why single-speed pumps of any size are largely gone from the certified list.
The biggest number people never think about
A house argues about the air conditioner and the electric heater. The pool pump, running quietly outside for eight to twelve hours a day, often uses more than either over a year — and unlike them it runs in mild weather too. On a pool with an old single-speed pump it is usually the single largest line on the bill, and the one with the clearest fix.
What this does not account for
These are certified pumps, and the sample is skewed toward variable-speed. Nine in ten certified models can slow down; most pumps already in the ground cannot. If yours is an older single-speed, its number is the ~900-watt row and up, not the 118-watt one.
Filtering hours depend on the pool, not the pump. How long you run it is set by pool size, turnover target and how dirty the water gets. The wattage here is measured; the hours are yours, and the calculator above takes them.
High speed is measured at a defined point, not a promise. The 742-watt figure is the median at the high-speed measurement point in the procedure. Your plumbing, filter and head change what a given speed draws.
Above-ground and in-ground pumps differ. The certified list is mostly self-priming in-ground filter pumps; above-ground non-self-priming pumps and booster pumps for pressure cleaners are separate and generally smaller.
Standby applies only to pumps that have a standby mode. The 4-watt figure is for models with one; a plain pump on a timer draws nothing when the timer is off.
This is electricity only, at 18.34 cents a kilowatt-hour. Your rate is on your bill.
Sources
- 01ENERGY STAR Certified Pool Pumps — power at low-speed and high-speed measurement points and standby (Version 3.0/3.1)U.S. Environmental Protection Agency ·
- 02Electric Power Monthly, Table 5.3 — average price of electricity to ultimate customersU.S. Energy Information Administration ·
How these figures are produced: see our methodology.
Figures are calculated from published wattages and a published tariff, both dated above. They are good for comparing devices, not for predicting your bill: your rate, settings and usage all differ.