Eternal 98% Efficient Water Heater

Eternal water heaters are a hybrid water heater, an on-demand condensing water heater with 2-gallons of storage. They are 98% efficient and have a 20-year warranty. The heat exchanger is stainless steel. Because of the storage, there is no “cold water sandwich”, no minimum flow rates, no flow restriction, and you can easily use a standard recirculating system.Some of the new “watersense” faucets have such low flow rates that the tankless on-demand heaters won’t fire. This is not an issue with the Eternal.

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