Is a variable-speed pool pump worth it?
Updated : · Piscines VP
Yes. It's the best way to filter continuously, as we recommend: at low speed, the pump uses a fraction of the electricity (power drops very fast as speed drops) and it's much quieter. It costs more up front; payback depends on your current pump's power, season length and electricity rate. Check available rebates.
It’s the question we get most when an old pump dies.
Why it uses less energy
According to the pump affinity laws, when speed drops:
- flow drops at about the same rate;
- power drops much faster (roughly with the cube of the speed).
At half speed, the pump theoretically uses about one eighth of the power it uses at full speed. For continuous, 24/7 filtration, that’s what keeps the bill reasonable. Try it with your numbers: electricity cost calculator.
Advantages
- Significant electricity savings.
- Much less noise at low speed.
- Less mechanical wear.
- Precise flow for heaters, salt systems and vacuuming.
Things to consider
- Higher purchase price.
- Short season in cold climates: payback is longer than in Florida.
- Electronics to protect from water and heat.
- Vibration doesn’t disappear. See Variable-speed pump noise.
Rebates
Utilities have offered rebates on efficient pool pumps. Check what’s available this season before buying.
Piscines VP installs variable-speed pumps in Laval and the Basses-Laurentides, Quebec.
Frequently asked questions
How long to pay back a variable-speed pump?
It depends on your current pump's power, season length and electricity rate. Our electricity cost calculator gives you an estimate with your own numbers.
Is a variable-speed pump really quiet?
At low speed, much quieter than a single-speed pump. But it can still make its surface vibrate, and some speeds can resonate.
Not sure of the cause? Take the 2-question diagnosis →
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