GAS-HEATED OR KEROSENE-HEATED BOILER FOR WARM WATER HOT WATER OR STEAM GENERATION

PCT No. PCT/HU83/00019 Sec. 371 Date Jan. 17, 1984 Sec. 102(e) Date Jan. 17, 1984 PCT Filed May 3, 1983 PCT Pub. No. WO83/04087 PCT Pub. Date Nov. 24, 1983.The invention relates to a gas-heated or kerosene-heated boiler for warm water, hot water or for steam generation having a substantially horizontal cylindrical combustion chamber defined and surrounded by a flue tube (1) consisting of a plurality of annular ring tubes (b 2) that are arranged in succession for conveying a suitable heat carrier and are held together by means of annular distance strips (3). At least some of the annular ring tubes have different inner cross sections and/or are arranged in a manner of having different, unequal spacing distances one to the next. Thus, a substantially uniform main diameter of the flue tube (1) is maintained, and despite of this, the flow of heat carrier circulated is harmonized with the thermal load which is non-equally distributed along the axis of the combustion chamber, resulting in improved utilization of the heat energy radiation at substantially constant wall temperature along the flue tube (1).