High efficiency water heater

摘要

A water heater having a vertical tank and a coil pipe located coaxial around the tank with a vertical ring space between them that serves as a ring combustor (bottom portion) and a flue for hot gases (upper portion). Assembly of low pressure (from about 500 Pa) plenum blower with air-blast gas burner is located right beneath of ring combustor. The burner's nozzle enters into the ring combustor tangentialy. A venting tangential outlet is located on top of the ring flue. The tank's water inlet ends with a nozzle having tangential direction. It is another water heater with two coaxial vertical coil pipes with a ring space between them and without a tank for hot water. The means for combusting fuel and venting gases are the same as in the preceding object.