Official registry data, priced with your utility's actual tariff.

The label on the appliance gives you a rating and an estimated yearly cost. The estimate is built on a national average energy price, not the price on your bill, and it stops at one year — not the ten or fifteen you will own the thing. The number you actually want is derivable from the same published test data. Nobody derives it for you.

This site does that arithmetic. It takes the measured figures manufacturers are legally required to file with government registries, applies the tariff your own utility actually charges, and shows the result with the source and the pull date attached to it.

What is missing: the product pages. No model, comparison or cost page is published yet.

Why: a page is only published once the number on it has been computed from a live registry pull and a live tariff lookup, with both sources dated. The data pipeline that does this is being built; publishing before it runs would mean publishing a figure we cannot stand behind.

What is here instead: the method, in full, before any number depends on it. What this site is and how errors get fixed are both readable now.

The first category is water heaters in the United States, using the U.S. Department of Energy's Compliance Certification Database as the coverage denominator: every basic model on file, not a selection of them. The United States section describes that scope.