Abstract: A heating and ventilation unit has a ceramic heat wheel rotatable within a housing between first and second plenums through which fresh and stale air, respectively, are forced to pass in a hot air ventilation system. The heat wheel is made of cordierite material such as is used in catalytic conversion systems for automobiles. It is formed with non-communicating and axially-extending parallel pores having a pore density of 62 pores per sq. cm. As it rotates the heat wheel transfers to the fresh air both the heat generated by a gas burner in the second plenum, and also low grate heat contained in the stale air. The burner is housed within a combustion housing by means of which the combustion gases are confined to a generally D-shaped area of the heat wheel.

Abstract: A gas fired boiler for a domestic hot water and/or central heating system has a burner (25) (FIG. 1), a static heat exchanger (22) through which water is circulated, and a rotary heat exchanger (12) of which the body is a disc of ceramic material such as is currently used for catalytic conversion in automobile exhaust systems. The rotary heat exchanger recovers heat from the gases passing from the static heat exchanger (22) to the outlet flue 4, and uses this recovered heat for heating the fresh air entering through the air intake (3). A conduit (90) having a controllable valve (91) enables heated fresh air to be supplied for space heating purposes if required, while improving the thermal efficiency of the boiler by promoting condensation of water vapor from the combustion gases as they pass through the rotary heat exchanger.

Abstract: A gas burner which consists of a cylindrical duct forming member closed at one end and open at the other end to receive a gas/air mixture under pressure. The member is perforated so that the gas/air mixture flows to the outside of the member where it is burned. The duct is provided with a cone-shaped plug for reducing the volume of the duct from the open end towards the closed end so that a constant velocity of gas/air mixture is maintained within the duct to obtain a uniform static pressure on the outside in the region where the gas/air mixture is burned.

Abstract: A hot water boiler, particularly for central heating and hot water supply in small dwellings where an economic unit with an output less than about 0.3 megajoule/hr (30,000 but/hr) is required, has a compact, cylindrical heat exchanger (110) with central combustion chamber (20) and forced draught. Water circulates through double-pass longitudinal waterways (12) in the monobloc heat exchanger body (111), in crossflow relationship to hot gases forced through short, narrow, annular radial passages (23). One or more walls (22) separating these passages may be replaced by a hollow wall within which water can circulate, increasing the heat exchange surface available.