Energy saving water heater control circuit
An energy saving control circuit for a water heater having a hot water storage tank provided with an electrically operated heater, i.e., an electric heater or an electrically controlled combustion burner, includes a water flow detection device associated with either the cold water inlet or hot water outlet of the tank for sensing the flow of water into or out of the tank and arranged to energize the heater upon detection of water flow indicative of the withdrawal of water from the tank. A holding circuit maintains the heater energized, even though the flow of water ceases, until such time as a thermostatic switch responsive to the temperature of the water in the tank disables the holding circuit and deenergizes the heater upon the water stored in the tank attaining a predetermined desired temperature. The heater remains deenergized notwithstanding the demand for heat by the thermostatic switch until such time as the water flow detector once more detects the withdrawal of hot water from the tank and the cycle of operation is repeated. Thus two interdependent conditions must simultaneously obtain for heater energization, i.e., (1) detection of heat demand by the tank thermostatic switch and (2) detection of water flow by the flow detection device.
- Assignee:
- EDB-83-095291
- Patent Number(s):
- US 4371779
- OSTI ID:
- 6309074
- Resource Relation:
- Patent File Date: Filed date 19 Sep 1980; Other Information: PAT-APPL-188975
- Country of Publication:
- United States
- Language:
- English
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