A hot water apparatus includes a burner, a sensible heat recovery heat exchanger, and an ignition plug. The sensible heat recovery heat exchanger includes a case. The ignition plug includes an insulator portion and two electrodes. The insulator portion includes a base end portion and a tip end portion. The tip end portion includes a tip end surface and a groove portion. The tip end surface is arranged opposite to the base end portion. The groove portion is recessed from the tip end surface toward the base end portion. The groove portion is arranged between the two electrodes and provided across top and bottom ends of the tip end portion. The groove portion has a lateral width decreasing from the top end toward the bottom end of the tip end portion.

Water heater (10) comprising a gas burner (11) being configured to combust gas if a heat demand is present, namely if heated water is requested by at least one water consumer (24), further comprising a heat exchanger (17) being configured to heat water using the thermal energy provided with the combustion of the gas, wherein the heat exchanger is a condensing heat exchanger, further comprising an input pipe (18) being configured to provide water to be heated to the heat exchanger (17), further comprising an output pipe (19) being configured to provide water heated by the heat exchanger (17) to the at least one water consumer (24), further comprising a siphon or trap (22) being configured to collect condensate resulting at the condensing heat exchanger (17) during operation of the water heater (10), further comprising a first connection pipe (21) and a valve (23) acting together with the first connection pipe (21), both the first connection pipe (21) and the valve (23) being configured to guide a water heated by heat exchanger (17) from the output pipe (19) to the siphon or trap (22), and/or to guide water not heated by the heat exchanger (17) from the output pipe (19) to the siphon or trap (22).

A hot water apparatus includes a burner, a latent heat recovery heat exchanger, a housing, a fixing member, an attachment member, and a straightening vane. The fixing member is configured to fix the latent heat recovery heat exchanger to the housing. The attachment member is configured to attach the fixing member to a case. The straightening vane is arranged in the case. The attachment member protrudes into the case. The straightening vane includes a top plate portion arranged upstream from the attachment member in a direction of flow of the heating gas in the case.

A furnace heat exchanger assembly includes first and second heat exchanger halves. The first heat exchanger half includes a first half of an exhaust channel and an inner joint flange half at an end thereof. The second heat exchanger half includes a second half of the exhaust channel and an outer joint flange half at an end thereof having first and second capturing tabs. The first and second heat exchanger halves are coupled together such that the first and second capturing tabs substantially overlap the inner joint flange half to form a joint flange.

A heat exchanger having a drainage member (1) mounted on an open end (322) of a heat-transfer tube (32), wherein the drainage member (1) contains a flow guide portion (11) including an insertion portion (11a) configured to be inserted into the heat-transfer tube (32) from the open end (322), and a projecting portion (11b) projecting toward an outside of the heat-transfer tube (32) from the open end (322) and extending downward.

A water heater tank has several components formed of a one-piece seamless construction. The water heater tank includes a cylindrical wall with inner and outer surfaces. A helical condenser channel may be formed in the outer surface of the cylindrical wall. The water heater includes a cold water inlet. A cold water channel may be formed in the inner surface of the cylindrical wall in fluid communication with the cold water inlet and the interior volume of the tank.

The invention discloses a condensing gas water heater, a condensing heat exchanger as well as heat exchanger plates. The condensing heat exchanger comprises: a housing and at least one heat exchanger plate disposed in the housing; the heat exchanger plate comprises a first metal board and a second metal board butting each other, wherein a surface of the first metal board and a surface of the second metal board which butt each other are butting surfaces, and two outer surfaces opposite to the butting surfaces are a first surface and a second surface, respectively; at least one of the first metal board and the second metal board is formed with a convex flow guide portion along a direction away from the butting surface; the first metal board and the second metal board form a fluid passage via the flow guide portion; and the housing is provided with a flue gas inlet and a flue gas outlet. The condensing gas water heater, the condensing heat exchanger as well as the heat exchanger plates provided in the invention can increase heat exchange efficiency, reduce cost, realize a modular assembly and improve ease of mounting.

A heating, ventilating, and air conditioning (HVAC) furnace includes a condensing furnace and a condensate removal system associated with the condensing furnace. The condensate removal system includes an electrolyzer having a container that may collect a condensate generated from an exhaust gas produced in the condensing furnace and an electrode disposed within the container and that may apply an electric current to the condensate to electrolyze the condensate and thereby generate condensate gases.

A heating, ventilating, and air conditioning (HVAC) system includes a furnace having a primary heat exchanger and a secondary heat exchanger, where the primary heat exchanger and the secondary heat exchanger form a heat exchange relationship between an airflow and an exhaust gas, and where the primary heat exchanger is positioned upstream of the secondary heat exchanger, a burner configured to generate the exhaust gas, a sensor configured to monitor an ambient temperature, and a control system configured to receive feedback from the sensor, compare the feedback to a threshold, operate the furnace in a first mode when the ambient temperature exceeds the threshold, and operate the furnace in a second mode when the ambient temperature is at or below the threshold, where the furnace operates above a condensation temperature when in the second mode, such that the exhaust gas does not condense when operating in the second mode.

A condensation management system, a furnace having the condensation management system and a cold end header box employable in the condensation management system are disclosed herein. In one embodiment, the condensation management system includes: (1) a first drain hose positioned to drain flue condensation from a flue pipe of the furnace, (2) a second drain hose positioned to drain the flue condensation from the flue pipe and (3) a condensation collector box configured to collect both the flue condensation and combustion condensation from a heat exchanger of the furnace, the condensation collector box including at least one drain for draining both the flue condensation and the combustion condensation therefrom.