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Heating boiler with furnace 2, flue ducts 11 for heating with wood, oil and electricity. The furnace 2 is surrounded by a water jacket 6 on at least two sides, preferably on the sides, top and bottom. One or more water tubes 7 extend into the furnace, both ends of which are connected to the water space 6 to facilitate water flow in the water tube 7 of furnace 2. <IMAGE>
A vertical tube heat exchanger panel for waste-recovery boilers such as black liquid boilers or household waste incincerator furnaces,and methods of manufacture