Abstract: An exhaust conduit for neutralizing condensate from high efficiency gas storage water heaters is provided. The exhaust conduit includes an inlet configured to be coupled to an exhaust outlet of the heater, an outlet configured to be coupled to an exhaust vent, and a condensate chamber having an interior in fluidic communication with the inlet and the outlet. The condensate chamber has a lower portion configured to receive a neutralizer and an upper portion having a service port configured to provide access to the lower portion of the condensate chamber. The condensate chamber further includes a fluid outlet for draining the neutralized condensate via a drain line. The exhaust conduit has one or more ridges disposed in the chamber that are arranged to define a channel for directing condensate from the inlet across the neutralizer toward the fluid outlet.

Abstract: Disclosed herein are heat pump systems for water heaters. The heat pump systems can comprise a housing defining an interior chamber, an air inlet, and an air outlet. The air inlet and the air outlet can form an air flow path through the interior chamber, and an evaporator unit can be positioned within the interior chamber such that the air flow path contacts the evaporator unit. The housing can also have a flue pipe having a cross-section to encourage aerodynamic flow and/or side baffles to encourage air flow into the evaporator unit. The housing can also have a second air inlet to increase air flow and a curved elbow around the first air inlet to direct the air flow path. The air flow path can flow from a top side of the housing to a side of the housing, and the air flow path can be reversible.