Electric resistance heating devices – Heating devices – Tank or container type liquid heater
Patent
1991-05-28
1994-03-08
Bartis, Anthony
Electric resistance heating devices
Heating devices
Tank or container type liquid heater
122 132, 126362, 392447, 392455, 392497, 392500, H05B 102, H05B 382, F24H 120
Patent
active
052934462
ABSTRACT:
A two-stage electric water heater which utilizes a centrally located, vertically-oriented flue pipe and multiple heating elements extending through selected lengths of copper tubing positioned in the flue pipe to heat the water surrounding the flue pipe. In a preferred embodiment a two-stage thermostat operates to selectively energize less than the total number of heating elements at a high energy level in order to raise the water temperature quickly from room temperature to a desired level. A single-stage thermostat may then be used to maintain the water at this temperature during normal operation. In another preferred embodiment the copper tubes through which the heating elements extend are dimpled or crimped into contact with the heating elements to increase heat transfer.
REFERENCES:
patent: 1779937 (1930-10-01), Holinger
patent: 1827087 (1931-10-01), Hynes
patent: 1839236 (1932-01-01), Lonergan
patent: 1986636 (1935-01-01), Holinger
patent: 2038476 (1936-04-01), Clark et al.
patent: 2104848 (1938-01-01), Clark
patent: 4282421 (1981-08-01), Aadar
patent: 4474139 (1984-10-01), Dobias
patent: 4506140 (1985-03-01), Armstrong
patent: 4514617 (1985-04-01), Amit
patent: 4578565 (1986-03-01), Dawidowitch
Brinson Ernest D.
Owens George G.
Bartis Anthony
Harrison John M.
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