CONTACT-SURFACE WATER HEATER Russian patent published in 2013 - IPC F24H1/10 

FIELD: heating.

SUBSTANCE: contact-surface water heater comprises the outer and inner pipes in the form of arcs, covers, a corrugated tube, spirals with high surface roughness, and a gas burner mounted in the end of the lower outer pipe. Inside the outer pipes connected to the cover, the interconnected pipes of cold water supply are located from the tube connected to the water supply system - the upper, vertical and lower. On the right, to the upper pipe at the end a cover is attached, which has inside the corrugated corner tube mounted on the flange of the pipe, it is pneumatically connected through the holes in it with the pipe, the cover and the chimney. Outside in the lower part of the horizontal pipe a tank is rigidly mounted, which is connected through the slit with the pipe which is connected hydraulically through the tube to the service tank mounted under the water heater.

EFFECT: compactness and increased efficiency of heating water.

1 dwg