How this site works

Tankless Size Chart lists the flow rate and temperature rise ratings that manufacturers publish for small tankless water heaters. It is a reference site. The heaters are not installed or tested by the site.

Sources of the ratings

Ratings come from manufacturer spec sheets, sizing guides and product pages. Each page lists those documents in a numbered note block. Fixture limits come from 10 CFR 430.32 and EPA WaterSense. Each rating is also compared with the burner or element input in section 9. A rating that does not pass is marked and kept out of the sizer. A number the manufacturer does not list appears as "Not listed". No missing number is filled in.

Not covered

Wiring, gas piping, venting and mounting are not covered. They are set by the manufacturer's installation manual and local code, and they are work for a licensed electrician, plumber or gas installer.

Funding

Today there is no advertising and no manufacturer pays to be listed. Source links go straight to manufacturer pages with no tracking code. Should commission links ever be added, every page carrying one will carry a notice above its first table.

Corrections

Manufacturer sheets get revised. Corrections go to support@tanklesssizechart.com with the page address and the newer sheet. The table is then rebuilt from the new number.