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Document |
Document Title |
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7614366 |
High efficiency water heater
An application for a method of heating water includes burning fuel to produce hot gases and heating a first mass of water with a first heat exchanger coupled to the hot gases. Heat remaining after...
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4944286 |
Immersible water heater
An immersible water heater for burning solid fuel to heat water contained within hot tubs, tanks, and the like. The heater includes a vertically oriented combined air-fuel intake tube by which the...
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4455997 |
Heating unit for hot tubs and/or spa units
A submerged heating unit fueled by wood and/or coal is disclosed for heating water in a tub or spa unit. The heating unit is composed of a single shell of a highly heat-conductive metal, such as...
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3301998 |
Humidifier having floating heating means
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