Electric resistance heating devices – Heating devices – Tank or container type liquid heater
Patent
1991-11-21
1993-11-16
Bartis, Anthony
Electric resistance heating devices
Heating devices
Tank or container type liquid heater
126351, H05B 102, F24H 120
Patent
active
052631168
ABSTRACT:
A heater for liquid includes a vessel having an inlet for cold liquid and an outlet for hot liquid, an electrically operated valve means to control the flow of liquid into the vessel through the inlet, and an electric heating means to heat the liquid in the vessel. A first control means operative for controlling the liquid level in the vessel responds to a level sensor by maintaining the electrically operated valve means continuously open until the level of liquid in the vessel reaches an upper limit. The heater has a second control means operable independently from the first control means and which responds to a temperature sensor by rendering the heating means operative in response to a liquid temperature below a first threshold temperature being sensed, and inoperative in response to a liquid temperature above a second threshold temperature being sensed. The The rate of the continuous water inflow and the rate of heat delivery to the liquid being such that the temperature of the liquid does not fall substantally below the second threshold temperature.
REFERENCES:
patent: 3282468 (1966-11-01), Karlem
patent: 3422745 (1969-01-01), Eisendrath
patent: 4354094 (1982-10-01), Massey et al.
patent: 4491146 (1985-01-01), Sveds
patent: 5019690 (1991-05-01), Knepler
Bartis Anthony
Heatrae Sadia Heating Limited
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