Pool pumps

Slower is cheaper, by a lot

Pump power falls with roughly the cube of speed. Run a pump at half speed and it draws about an eighth of the power; it has to run twice as long to move the same water, so it uses about a quarter of the energy. That’s why a variable-speed pump can cut pool electricity by more than half, even though it runs more hours. Your savings

The federal rule

Pool pumps made or imported since July 19, 2021 must meet Department of Energy efficiency standards. For most inground pool filter pumps, only variable-speed designs meet them. You don’t have to replace a working pump, but when an old single-speed pump dies, its replacement will almost certainly be variable speed.

Getting it right

• Program it. A variable-speed pump only saves if it runs at low speed most of the time. Use higher speeds only for vacuuming, a spa or a heater that needs more flow.
• Hire a pro to install it. Pool pumps are hardwired, and pool electrical work has strict bonding and GFCI rules. Many states and towns require a licensed electrician or pool contractor.
• Ask your utility. Many pay rebates on ENERGY STAR variable-speed pumps.
• Cover a heated pool. A cover cuts evaporation, the biggest source of heat loss.

Picks