Pool + spa electric cost — heater, pump, lighting savings

Pool + spa cost stack

Pool pump (single-speed 1.5-2 HP): 1,500-2,500W x 8-10 hr/day = 12-25 kWh/day = $40-$80/month at $0.13/kWh.

Pool heater (electric): 5,500W heat pump or 11,000W resistance. Resistance: $5-$15/hour to operate. Heat pump: $1.50-$4/hour. Rarely used in summer if pool is unheated.

Pool lighting (LED replacement): 30-50W LED replaces 300-500W incandescent. $5-$10/month savings vs old.

Spa heater + pump: 1,500-3,000W. Insulated cover lock-in is biggest variable. Spas with covers off cost 3-5x more to maintain temperature.

Top cuts by ROI

Variable-speed pool pump: 80% pump savings. The pool-pump-variable-speed-savings guide covers the math + utility rebate ($100-$350).

Solar pool cover: $50-$200 cover, cuts evaporation 80% and heating cost 30-50%. Pays back in one season.

Heat pump pool heater (vs resistance): 60-75% reduction in heating cost. $2,500-$5,000 install, 2-4 year payback if heating is regular use.

Smart timer: schedule pump for off-peak hours. The how-to-shift-electricity-usage-off-peak guide covers TOU automation.

Spa-specific tactics — the cover discipline

Insulated cover always when not in use. The single biggest variable in spa operating cost is whether the cover is on or off when nobody is using it. Spas with covers always on cost $20 to $50 per month to maintain; spas left uncovered run $80 to $200 per month for the same heat output.

Drop temperature 2 to 5F overnight if used in evenings only. Most modern spas have programmable temperature schedules — set lower at night, ramp up an hour before evening use. Saves 10 to 20 percent of weekly energy.

Set economy mode if your spa supports it. Most newer Hot Spring, Caldera, and Sundance models offer economy mode that maintains a lower base temperature and ramps to setpoint only on scheduled use. Saves another 15 to 25 percent.

Spa replacement: modern foam-filled fully-insulated spas cost 30 to 50 percent less to operate than older partial-insulation builds. If your spa is 10+ years old and the foam insulation has compressed or degraded, replacement may pay back through energy savings alone within 6 to 10 years.

TOU rates and pool/spa scheduling

For households on time-of-use electricity rate plans, scheduling pool pumps and spa heating to off-peak hours can save another 30 to 60 percent on top of the variable-speed and cover savings. Modern smart pool controllers (Pentair IntelliCenter, Hayward Omni) integrate with utility TOU schedules automatically.

In California (NEM 3.0 territory), pool pump scheduling has become especially valuable because the difference between peak and off-peak rates can be 4 to 6x. A typical pool with smart controls can save $30 to $80 per month vs running on default schedule.

For pool customers with rooftop solar, scheduling the pump for midday when solar production is highest captures the export credit. The how-to-shift-electricity-usage-off-peak guide covers the broader TOU optimization framework.