FIELD: small water and steam boilers. SUBSTANCE: boiler has auxiliary section incorporating combustor and catalytic fuel combustion section (first and second design versions) or at least two catalytic fuel combustion sections (second and fourth design versions); auxiliary section is provided with air and stack gas mixer and heat exchanger. Catalytic fuel combustion sections starting from second one have starting heater meant to heat up catalyst during boiler starting. EFFECT: improved reliability and performance characteristics. 10 cl, 8 dwg
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