Safety device for instant water heater

Details Safety device for instant water heater Safety device for instant water heater

1975-01-08

1976-07-27

Sprague, Kenneth W.

Liquid heaters and vaporizers

Safety devices

Fire extinguishers

431 75, F22B 3742, F23N 502

Patent

active

039713440

ABSTRACT:
The safety device disclosed herein is adapted for use with low power gas burning water heaters which are unvented. In order to limit the duty cycle of the heater, a thermal mass having a preselected thermal inertia is heated from the burner through a probe of limited heat conductivity so that the temperature of the thermal mass rises relatively slowly during operation of the heater and cools relatively slowly in the intervals between operation. If the thermal mass reaches a predetermined threshold temperature, the heater is turned off or sharply throttled back so as to limit the emission of combustion products into the atmosphere.

REFERENCES:
patent: 2312479 (1943-03-01), Ray
patent: 2412235 (1946-12-01), Denberg et al.
patent: 3738352 (1973-06-01), Reichmann

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