GB275425A - Improvements in water heaters - Google Patents

Abstract

275,425. Dehn, F. B., (Dunham Co.). Aug. 28, 1926. Heating water. - A water heater comprises a water chamber between an outer shell and an inner flue portion which is shaped so as to provide superposed pairs of outwardly protruding convolute gas passages, the passages of each pair being separated by open-ended cross water passages, and adjoining pairs being connected by a neck portion. The flue casting comprises a tapering combustion chamber 35 with flattened side walls 37 terminating in a throat 38 considerably above a water supply pipe and a draining faucet 33 on the outer shell. The flue divides above the throat 38 into two convolute passages 41 separated by a cross water passage 43 communicating with the surrounding water space and providing a ridge-shaped baffle 44. A series of further convolute flue passages 46, 49, 52 leads to a throat 56 extending through the shell and accommodating the lower end of a stack 69. The cross-sectional area of the convolute passages decreases progressively upward and the uppermost pair are more widely divergent than the preceding pair, a reservoir space being provided within the dome-shaped upper part of the shell. A water outlet pipe 53 is located on the top of the shell preferably midway between the ends of the cross passage 55. The flue is cast so that its interior surface is rough in order that moisture in condensing in the upper portion is caused to spread and be evaporated. In a modification (Fig. 11, not shown) the flue comprises two series of pairs of gas passages, the adjacent passages of each series merging into each other and a third series of cross water passages being formed in staggered relation to the water passages on each side.