Variable Speed vs Single Speed Pool Pumps

The pool pump is usually the second-largest electricity consumer in a home after the HVAC. Switching from a single-speed to a variable-speed pump is the single most impactful upgrade most pool owners can make.

The physics of the savings

Pump power consumption follows the affinity law: power drops with the cube of speed. Run a pump at half speed and it moves half the water, but uses only one-eighth the electricity.

A single-speed pump runs full-blast constantly — often 1,500–2,000 watts. A variable speed pump filtering at low speed might draw 150–400 watts for the same gallons moved over a longer period.

Real-world savings

For a typical 20,000-gallon pool:

• Single speed: ~$60–$120/month electricity
• Variable speed: ~$15–$35/month electricity

Annual savings of $500–$1,000 are common, meaning a variable speed pump often pays back in under two seasons.

Beyond the energy bill

Variable speed pumps also:

• Run quieter at low speed
• Reduce filter pressure, extending filter and plumbing life
• Qualify for utility rebates in many regions (check local programs)
• Support app scheduling for overnight low-rate electricity

When a single-speed pump still makes sense

Single-speed pumps remain a good fit for:

• Small above-ground pools
• Seasonal pools used only a few months
• Budget-limited installations where the higher upfront cost cannot be absorbed

The bottom line

If you run your pump 6+ months a year, a variable speed pump almost always pays back and then keeps saving. See the Illuminex AquaPump variable speed lineup or find a dealer for a sizing recommendation.