Water heater

Details Water heater Water heater

2008-03-04

2008-03-04

Wilson, Gregory (Department: 3749)

Liquid heaters and vaporizers

Stand boiler

Fluid fuel burner

Reexamination Certificate

active

07337753

ABSTRACT:
The water heater includes a burner and a water tank. Combustion products flow upwardly around the tank through a combustion products path where heat transfer to water in the tank occurs, the path being defined between the outer wall of the tank and a surrounding heat exchanger wall. The combustion products pass through outlet at the upper end of wall, and enter the flue which includes a down flow passage and then pass out through discharge outlet. The down flow passage is defined between a flue outer wall and a thermally conductive partition defining the inner wall of the passage. The partition is adjacent a heated zone of the water heater where stored heat of the water heater is available during quiescent or standby periods when the burner is not operating. The partition between the heated zone and the down flow passage provides a heat transfer path so that heat in the heated zone can transfer through the partition to gases in the down flow passage. This will assist or promote the functioning of the down flow passage as a heat trap during quiescent or standby periods when the burner is not operating.

REFERENCES:
patent: 3490420 (1970-01-01), Kramer
patent: 4280450 (1981-07-01), Maruyama
patent: 5357907 (1994-10-01), Moore et al.
patent: 5361729 (1994-11-01), Trihey
patent: 5499621 (1996-03-01), Trihey
patent: 6237544 (2001-05-01), Croxford et al.
patent: 6318304 (2001-11-01), Teschner
patent: 6378777 (2002-04-01), Valcic et al.
patent: 0 043 232 (1982-01-01), None

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