Abstract: A water heater including a water container; a combustion chamber adjacent the water container; a burner associated with the combustion chamber and arranged to combust fuel to heat water in the container, the burner having a combustion surface and adapted to receive fuel; and a pilot burner including an orifice tube, an outer elongated sheath substantially concentrically positioned around at least a portion of the orifice tube and creating a space between the orifice tube and the sheath, and at least one opening sized and shaped to admit combustion air through the sheath and into the space.

Abstract: A low NOx water heater including a water container; a combustion chamber adjacent the water container having an opening covered with an open flame arrestor; a burner associated with the combustion chamber and arranged to combust fuel to heat water in the water container, the burner including a plenum chamber having a combustion surface and a fuel/air conduit adapted to receive fuel and air and extending between and sealed to the plenum and a wall of the combustion chamber; and a heat resistant acoustic absorber positioned on the wall.

Abstract: A low NOx water heater including a water container, a combustion chamber adjacent the water container; and a burner associated with the combustion chamber and arranged to combust fuel to heat water in the water container, the burner comprising a plenum chamber having a combustion surface and a device to detect the presence of the collection of lint, dirt and/or oil.

Abstract: A low NOx water heater including a water container; a combustion chamber adjacent the water container; and a burner associated with the combustion chamber and arranged to combust fuel to heat water in the water container, the burner comprising a plenum chamber having a combustion surface and a device to detect the presence of the collection of lint, dirt and/or oil.