Abstract: Apparatus for providing an admixture of first and second fluids has a first body having opposite ends, a chamber between such opposite ends, an inlet for first fluid into that chamber, and an aperture for the admixture at an end of that chamber. That apparatus also includes a second body having an inlet aperture for second fluid spaced from the first body, an outlet aperture spaced inside the chamber from the aperture for the admixture, and a fluid flow channel decreasing in cross-sectional area from the inlet aperture spaced from the first body to the outlet aperture inside the chamber between opposite ends of the first body. Such first and second bodies jointly comprise a flange structure at the first body and between the inlet and outlet apertures of the second body. An admixture flow channel increases in cross-sectional area away from the aperture at the end of the chamber.

Abstract: A water and/or space heater is provided in which water is circulated to prevent the localized overheating or vaporization thereof.

Abstract: A fuel fired, high capacity, high efficiency water heater uses a cylindrical plastic tank. The strength of the plastic tank is maintained by keeping the side wall imperforate and providing all access to the interior through metallic top and bottom plates.

Abstract: A condensate trap in the exhaust gas conduit of a forced draft water and space heater comprises a housing providing a chamber open at its upper end to the exhaust conduit and having a condensate outlet below the inlet and controlled by a float valve in the chamber.

Abstract: A forced draft gas burning water and/or space heater having a screen type vertically extending tubular burner provided with a deflector plate supported transversely within the burner tube for free vertical sliding movement therein on a vertical extending guide rod mounted in the burner tube. At the outset of each heating cycle of the heater, the pressurized combustible gas/air mixture initially forced upwardly into the open lower end of the burner tube pushes the deflector plate upwardly therein along the guide rod and is deflected thereby laterally outward through the apertured screen wall of the burner tube into the bottom region of the combustion chamber of the heater to cause immediate ignition of the initial combustible gas/air mixture by the igniter means located within the combustion chamber and eliminate any sputtering ignition effect.

Abstract: A water heater having the inner door that closes the inner access opening leading into the combustion chamber formed as a component part of a unitary manifold assembly which also includes the main burner with its manifold gas supply tube, the pilot burner with its gas supply tube, and the pilot burner control thermocouple with its support tube. The inner door thus may not be removed for servicing of the water heater unless the complete manifold assembly is removed from the inner access opening, in which case the water heater is then rendered inoperative and incapable of main burner ignition to produce burner flames which could otherwise spill-out through an uncovered inner access opening left open by an unreplaced inner door. The inner door component of the manifold assembly has a pilot burner lighting port which is normally closed off by a spring loaded door and which also enables observation of the pilot and main burner flames.

Abstract: A water and/or space heater is provided in which water is circulated to prevent the localized overheating or vaporization thereof.