COMMERCIAL PROJECT PLANNER · USER-ENTERED QUOTES · TRANSPARENT ASSUMPTIONS
Heat Pump Water Heater Payback Planner
Compare annual electricity use and the incremental installed cost of a heat-pump water heater to estimate simple payback.
Compare annual electricity use and incremental project cost
Enter your local tariff or load an available country reference.
Actual water-heating use depends on household hot-water demand, inlet-water temperature, setpoint, installation and operating mode.
Use incremental cost for replacement decisions
If you would need to buy a replacement water heater anyway, compare the extra installed cost of the heat-pump model with the alternative—not necessarily the full project price.
Compare scope, assumptions and exclusions—not just the total price.
Use WattCostLab’s quote checklist before signing a contract. It helps you compare like-for-like project scope without claiming that a referral marketplace is active.
Frequently asked questions
Does WattCostLab supply a contractor price on this page?
No. Enter real quotes or local project estimates. The calculator is designed to make scope differences visible.
Should I size HVAC equipment from square footage alone?
No. Building load depends on climate, envelope, glazing, infiltration, internal gains and design conditions; use a proper load calculation for sizing.
Can Location change the energy tariff?
Where an official or configured country energy reference is available, the tool can load it as a starting point. You can overwrite it.