Abstract: The apparatus for heating a fluid comprises a heating enclosure supplied in its lower part with fluid to be heated, a combustion chamber comprising a burner at one of its ends and extending on the side opposite the burner inside the enclosure, a fume circulation tube disposed inside the enclosure to constitute a contra-flow heat exchanger, which tube is hermetically connected to the outlet of the combustion chamber and opens out in a fume evacuation device located in the lower part of the enclosure in order to evacuate the fumes to outside the heating apparatus, and means for taking heated fluid in the upper part of the enclosure. The heat exchanger tube is constituted by an originally flexible, tight, ringed metal tube, disposed spirally substantially in the lower third of the enclosure, and so that the different turns of the ringed tube are tangentially in contact with one another in order to form a compact exchanger.

Abstract: A device for mounting a gas-fired heating apparatus on a wall and connecting it through a flue for communication with the outside of the wall. The flue comprises inner and outer coaxial tubular members defining inner and outer conduits for carrying combustion supporting air from the exterior to the heating apparatus and combustion gases from the heating apparatus to the exterior. A register admitting combustion supporting air and venting combustion gases is fitted at the free end of the flue remote from the heating apparatus. A support plate has a circular aperture in a base for locating the support plate on the outer coaxial tubular member and wings cooperable with fittings on the heating apparatus for supporting the heating apparatus. A gasket with a retaining collar is received along a portion of the support plate and tightened on the outer coaxial tubular member.

Abstract: A boiler is disclosed comprising a heat exchanger having a plurality exchanger modules which are plugged in upper and lower headers connected in the heating circuit of a central heating system. The headers are secured to the rear wall of a casing and the modules are slidably mounted in guideways in the casing. Upper and lower latch bars are biased to their latching positions for preventing the modules from being uncoupled with the headers under pressure in the heating circuit. The exchanger modules may be installed and removed separately without the need of any tools.