5 certified models

Burnham by U.S. Boiler commercial water heaters

Every Burnham by U.S. Boiler water heater certified under ENERGY STAR and listed for the US market, fastest first. Each model page has the full certified specs and comparable machines from other makers.

Model	Type	Fuel	Storage	Input rate
CTDW1000L	Gas Tankless	Gas, Propane	9 gal	999 kBtu/h
CTDW400	Gas Tankless	Gas, Propane	4 gal	399 kBtu/h
CTDW500	Gas Tankless	Gas, Propane	5 gal	500 kBtu/h
CTDW650	Gas Tankless	Gas, Propane	6 gal	650 kBtu/h
CTDW800	Gas Tankless	Gas, Propane	7 gal	800 kBtu/h

Source: ENERGY STAR certification data, US EPA. Data build 2026-09-29. Brand names are as the maker certified them, with obvious variant spellings merged.