Indirect Water Heater Efficiency

Nowadays, seemingly all household products have some sort of efficiency rating associated with them. These ratings can allow products to achieve Energy Star status and help owners qualify for tax deductions and rebates from local utility companies. Plumbing and heating products, most notably boilers and water heaters, have efficiency ratings. It would make sense, then, that an indirect water heater (which is essentially a water heater tank attached to a boiler) would also have an efficiency rating. None of them do, however, because the boiler heats the water in the indirect tank. This means that an indirect water heater is only as efficient as the boiler connected to it.