Abstract: A hot water heater for trailers or mobile homes and the like, wherein increased heat capacity is provided due to exposure to combustion gases over large heating surfaces and including the use of heating fans whereby the heated water is conducted to radiators with the maximum heating temperature. The arrangement also provides for an additional supply of hot air in the area to be heated thereby eliminating the cold zone in the center of the room.

Abstract: A space heater for small rooms, e.g. house trailers or ship's cabins, comprises an undulating heat exchanger centered on a vertical axis and a combustion pipe surrounded thereby. A burner enters the lower end of the combination pipe whose upper end is closed except for a number of lateral openings communicating with outwardly closed smoke channels of the undulating heat exchanger which alternate with outwardly open air channels. An outer peripheral wall, spacedly surrounding the heat exchanger, forms with its air channels an annular conduit for the conveyance of ambient air entering that conduit near its bottom and leaving it at its top.

Abstract: A space heater for small compartments in which the burner is received in an upwardly open tray bottom which has an outwardly extending flange connected to an outwardly extending flange at the lower end of the combustion chamber. The tray has a lateral opening for the combustion air thereby eliminating the need to go through the floor with a pipe forming a combustion air intake.