Energy Efficient Condensing Side-arm Gas Water Heater

Residential gas water heating

Promises to be ~ 90% efficient; 30% more efficient than conventional gas water heaters Could be manufactured by adapting a basic electric water heater tank

James Lutz of Berkeley Lab has invented a gas water heater that promises to be up to thirty percent more efficient than conventional gas water heaters. The design replaces the traditional central flue with a side-arm heat exchanger, thereby eliminating standby energy losses that occur when heat is transferred from the hot water to the cooler central flue when not actively being heated. The heated water is transferred from the heat exchanger to the tank by thermosiphonic action, or through heat-induced density changes in the water acting as a driver. No mechanical pump is necessary.

Integral to the side-arm component is a simple system for capturing heat from the water vapor in the combustion products – a second source of energy inefficiency in conventional design – and collecting the condensate so that it doesn’t exit through the venting system. This process involves using a small, low power electric fan and the cold water at the bottom of the water tank for cooling. A basic electric water heating tank can be adapted to the Berkeley Lab design.

This invention could be combined with an existing low-emission burner technology to produce a revolutionary clean burning and efficient gas water heater.

Inventor(s): James Lutz

Type of Offer: Licensing

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