A combustion chamber assembly unit for a fuel-operated vehicle heater includes a mixing chamber (20) extending in a direction of a combustion chamber assembly unit longitudinal axis (L) for generating an air/fuel mixture. A fuel feed device (38) feeds fuel to the mixing chamber (20) and a combustion air feed device feeds combustion air to the mixing chamber (20). A diffuser device (22) is arranged downstream in relation to the mixing chamber (20) in the direction of the combustion chamber assembly unit longitudinal axis (L). The fuel feed device (38) includes an evaporator device (36). The combustion air feed device (18) includes a swirling flow generation device (14). The swirling flow generation device (14) is arranged with the evaporator device (36) upstream in relation to the mixing chamber (20) in the direction of the combustion chamber assembly unit longitudinal axis (L).

A heater comprises a combustion chamber and a jacket extending about the combustion chamber. There is a fan having an output which communicates with the combustion chamber to provide combustion air. There is also a fuel delivery system having a variable delivery rate. A burner assembly is connected to the combustion chamber. The burner assembly has a burner mounted thereon adjacent the combustion chamber. The burner receives fuel from the fuel delivery system. There is an exhaust system extending from the combustion chamber. An oxygen sensor is positioned in the exhaust system to detect oxygen content of exhaust gases. There is a control system operatively coupled to the oxygen sensor and the fuel delivery system. The control system controls the delivery rate of the fuel delivery system according to the oxygen content of the exhaust gases.

A method to operate a fuel-operated vehicle heater comprising the lowering of a combustion air ratio λ between supplied combustion air and supplied fuel to a combustion chamber of the fuel-operated vehicle heater from a starting value λ.sub.start>1 to a range λ<λ.sub.start for a time period Δt.

The invention relates to an end line assembly (10) for a heating device (30) of a vehicle (42) fit for habitation, in particular a caravan, motorhome or ship, comprising: at least one exhaust-gas pipe portion (16-1, 16-2) for leading away exhaust gases of an associated burner of the heating device (30); at least one combustion air pipe portion (18) for feeding combustion air to an associated burner of the heating device (30), the exhaust-gas pipe portion (16-1, 16-2) and the combustion air pipe portion (18) being parallel to one another and immovable in a sleeve portion (20), the outside (22) of which delimits the line assembly (10) with respect to the surroundings.

A vehicle heater includes a combustion chamber assembly unit (18) to be fed with fuel and combustion air, a housing (22) with a circumferential wall (24) defining a combustion air flow space (26), a combustion air blower (30) adjoining an end face (28) of the circumferential wall (24) of the housing (12) in the direction of a housing longitudinal axis (L), a fuel feed line and a sealing formation with a first sealing formation area arranged between the end face (28) of the circumferential wall (24) and the blower housing (32). A second sealing formation area (62) is positioned to mesh with a fuel feed line passage opening (38) for establishing a closure between the circumferential wall (24) and the fuel feed line (36). The sealing formation (56) includes a sealing element (54) providing the first sealing formation area (58) and the second sealing formation area (62).

A vehicle heater includes a heater housing (12), through which heating air to be heated can flow, with a heating air inlet area and with a heating air outlet area. A burner unit is arranged in the heater housing. A combustion air blower is arranged in the heater housing for feeding combustion air to the burner unit. A heat exchanger unit is arranged in the heater housing (12). Heating air flowing through the heater housing (12) can flow around the heat exchanger unit. A combustion air intake muffler (76), which is essentially arranged in the heater housing (12), is associated with the combustion air blower (46).

A combustion chamber assembly unit for a fuel-operated vehicle heater includes a combustion chamber housing (14) elongated in a direction of a housing longitudinal axis (L), with a combustion chamber (16) radially outwardly bounded by a circumferential wall (18), and with a combustion chamber bottom (20) axially delimiting the combustion chamber (16). A combustion air feed volume (36) is provided that is open to the combustion chamber (16) via a plurality of passage openings (38). A cooling medium feed device (46) is provided for feeding a liquid cooling medium to the combustion air feed volume (36).

A vehicle heater includes a housing (10) with a circumferential wall (12), defining a combustion air flow space (14), having a fuel line passage opening (30), a combustion chamber assembly unit, and a fuel line (28). The fuel line has a connection end area (54) adjoining the combustion chamber assembly unit (18), an external connection end area (58), outside the circumferential wall and a line area (56) between the end areas and passing through the fuel line passage opening. A sealing formation (32) has a first sealing area (34), meshing with the fuel line passage opening, and a passage opening (52) through which the line area of the fuel line passes. The fuel line has a larger cross-sectional dimension in a throughput length area (60), passing through the passage opening, than in a section of the line area located between the throughput length area and the external connection area.

A pellet stove to heat the interior of a structure and provide a heating surface for cooking. The pellet stove has a hopper storing pellet fuel, a core assembly inside a stove enclosure, a primary burn chamber assembly for burning pellet fuel and an air venting system. The hopper gravity feeds pellet fuel to the primary burn chamber assembly. The core assembly has a burn chamber housing connected to a flame chamber by a burn channel. The primary burn chamber assembly has a burn basket and a fuel control mechanism to control the amount of pellet fuel burned in the burn basket. The venting systems draws inlet air into and discharges exhaust air out of the pellet stove, which is sealed to prevent drawing inlet air from or discharging exhaust air to the structure interior. Fire in the flame chamber can be seen through an exterior glass panel.

A combustion chamber assembly unit for a fuel-operated vehicle heater includes a mixing chamber (20) extending in a direction of a combustion chamber assembly unit longitudinal axis (L) for generating an air/fuel mixture. A fuel feed device (38) feeds fuel to the mixing chamber (20) and a combustion air feed device feeds combustion air to the mixing chamber (20). A diffuser device (22) is arranged downstream in relation to the mixing chamber (20) in the direction of the combustion chamber assembly unit longitudinal axis (L). The fuel feed device (38) includes an evaporator device (36). The combustion air feed device (18) includes a swirling flow generation device (14). The swirling flow generation device (14) is arranged with the evaporator device (36) upstream in relation to the mixing chamber (20) in the direction of the combustion chamber assembly unit longitudinal axis (L).