Estimate electricity savings by switching to a VSD pool pump. Calculate ROI and monthly energy cost reductions based on your local power rates. Modern variable speed pumps can reduce your energy consumption by up to 80% compared to traditional single-speed models.
This tool compares the running cost of your existing single-speed pump against a variable-speed (VSD) replacement, so collect four inputs. First, your current pump's power draw in watts: read the nameplate or a plug-in meter; a typical 1 HP single-speed pump pulls roughly 1,500-1,900 W. Second, daily runtime in hours (many owners run 8 hours). Third, your electricity rate per kilowatt-hour from your utility bill (US average near $0.16/kWh; many EU tariffs sit at 0.25-0.35 EUR/kWh). Fourth, the expected VSD operating profile, since variable-speed pumps spend most hours at low RPM where the affinity laws slash consumption: filtering at half speed can draw only about 200-300 W. Enter the higher-RPM hours separately if you run a heater or cleaner. The tool needs no pool volume; energy cost depends on watts, hours, and rate, not gallons or litres. Have the VSD purchase price handy too if you want a payback estimate.
Daily energy (kWh) = watts / 1000 x hours; cost = kWh x rate. The affinity laws say power scales with the cube of speed, so halving RPM cuts draw to roughly one-eighth. Worked example: a 1,800 W single-speed running 8 h/day = 14.4 kWh/day, or about 432 kWh/month; at $0.16/kWh that is roughly $69/month. A VSD filtering the same water at low speed might average 300 W but run 12 h to match turnover = 3.6 kWh/day, about 108 kWh/month, near $17/month. Monthly saving: about $52, or roughly $620 per year. If the VSD installed costs $1,200, simple payback = 1200 / 620 = about 1.9 years. In metric terms, 432 kWh versus 108 kWh at 0.30 EUR/kWh saves roughly 97 EUR/month. Longer low-speed runtime usually filters better while still costing far less, because the cubic relationship dominates the extra hours.
Accurate inputs matter because a guessed wattage skews payback by months. Measure actual draw rather than trusting horsepower, which overstates real consumption. The most common error is comparing equal runtimes: a VSD is only cheaper when you exploit low RPM over longer hours, so do not copy your old 8-hour single-speed schedule at high speed. Safety is largely electrical here: confirm circuit and breaker compatibility, and have a qualified electrician handle any hard-wiring, since pool equipment shares space with water. Verify your real rate, including tiered or time-of-use pricing, before trusting savings, and re-run the numbers seasonally as runtime and tariffs change. Many regions also offer utility rebates that shorten payback further. Finally, confirm the low speed still achieves at least one full daily turnover so water-quality and sanitizer distribution never suffer for the sake of savings.
Yes. Most owners see a full return on investment in under two years through significantly lower electricity bills. They also run much quieter and last longer.
Input your current pump wattage and runtime, your electricity rate, and the estimated lower speed settings of a VSD pump into our calculator for an instant report.
For filtration, run it at a very low RPM for a longer period. For cleaning or heating, you will need to increase the RPM to meet the specific flow requirements of that equipment.