Disclaimer

Every tool on WattPayback shows this short reminder above its results:

Estimate only. Based on the assumptions you entered. Get a site-specific survey before spending money.

Defaults (specific yield, self-consumption, SCOP, grid intensity and so on) are mid-range starting points from commonly cited ranges. They are not facts about your roof, climate, tariff or installation quality.

Solar generation, heat-pump performance, battery throughput and insulation savings depend on site-specific factors that a web form cannot capture. Use these calculators to understand sensitivity — which inputs move the answer — then verify with professionals.

See also terms and privacy.