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| Number | Title | Issue Date |
| 7299768 | Gas-fired water heating apparatus The water heating apparatus has an upright cylindrical thermally insulated storage tank, an axially extending exhaust gas pipe passing centrally through the storage tank and a combustion chamber under the storage tank. An atmospheric gas burner, which has a complete... | 11/27/2007 |
| 4735174 | Hot water heater with counterflow action This gas hot water heater has a storage tank with a vertical flue having an elongated tube surrounding the flue to form an inverted inner tank that is closed at its top portion while being open at its bottom portion to the storage tank. A service water in... | 04/05/1988 |
| 4612879 | Hot water heater and steam generator In a water tube boiler comprising a housing enclosing tubes bent to form vertical chambers successively traversed by rising hot combustion gases, the tubes being connected at the bottom to the interior of the jacket of a jacketed cylindrical combustion ch... | 09/23/1986 |
| 4557220 | Gas apparatus for producing hot water There is described here a gas water heater consisting of a blower (1), a premixing device (2), a gas burner (3), a heat exchanger (4), and a waste gas heat exchanger (5). Gas burner (3) works as super-stoichiometrically premixing burner and has a burner p... | 12/10/1985 |
