A heat exchanger unit according to the present invention comprises: a sensible heat exchanger including a sensible heat exchange pipe disposed in a sensible heat exchange area for heating water used for heating by receiving sensible heat generated by a combustion reaction, wherein the sensible heat exchange pipe receives the water used for heating and flows same through the interior, and a sensible heat fin disposed in the sensible heat exchange area, wherein the sensible heat fin is formed in a plate shape across the sensible heat exchange pipe and penetrated by the sensible heat exchange pipe; and a latent heat exchanger positioned downstream from the sensible heat exchange area on the basis of a reference direction, which is a flow direction of combustion gas generated during the combustion reaction, the latent heat exchanger including a latent heat exchange pipe disposed in a latent heat exchange area.

A passive heater for heating a drainage tube, the passive heater including: an elongated flexible thermal conductor including a first end and a second end, wherein the first end is configured to be disposed in contacting relationship with a heat source and at least a portion of the elongated flexible thermal conductor is configured to be disposed in contacting relationship with a portion of the drainage tube; and an eyelet disposed on the first end, the eyelet configured to facilitate the securement of the elongated flexible thermal conductor to the heat source, wherein the first end is configured to receive heat and transmit it along the elongated flexible thermal conductor to increase temperature of the portion of the drainage tube to prevent freezing of a fluid through the drainage tube.

A heater having a burner, a first heat exchanger associated with the burner, a second heat exchanger above the first heat exchanger in fluid cooperation with the first heat exchanger and an ambient air intake blower above the second heat exchanger. The second heat exchanger comprises angularly disposed finned section so condensate within the second heat exchanger flows to a collection point and is collected in a trap. The trap includes a sensor to sense buildup of fluid in the trap with feedback to the heater controls. The heater may include a collection pan below the heat exchangers in fluid communication with the trap. In one aspect the collection pan may include a heating element to vaporize the fluid so that heated, humidified air is expelled through vents adjacent the base of the heater. In another aspect, the pan includes an ultrasonic vaporization element to vaporize fluid in the pan.

Aspects of the invention are directed to condensate traps having a back portion and a front portion. The back portion includes a first passage enclosed between the first wall, a second wall, and a back wall. A first opening in the back portion connects the first wall and the second wall with a first float placed over the first opening and does not travel below the first opening and is prevented from leaving the first passage by a first constriction. The front portion of the condensate trap includes a second passage enclosed between the third wall and the fourth wall. A second opening connects the third wall and the fourth wall in the front portion and a second float is placed below the second opening such that it does not travel through the second opening and is prevented from falling below a predetermined level by a second constriction.

The present disclosure relates to a condensate trap for a gas furnace for collecting and discharging condensate generated in a heat exchanger and an exhaust pipe, the condensate trap including: a first inlet through which the condensate generated in the heat exchanger is introduced; a second inlet through which the condensate generated in the exhaust pipe is introduced; a first passage through which the condensate introduced from the first inlet passes; a second passage through which the condensate introduced from the second inlet passes; a discharge port through which the condensate, having passed through the first passage and the second passage, is discharged outside; and a backflow prevention device disposed on the first passage and configured to prevent backflow of air, wherein the backflow prevention device includes: a housing; and a core which is movably disposed in the housing, and which in response to an amount of the condensate introduced from the first inlet being less than or equal to a predetermined amount, prevents backflow of the air by closing the first passage.

A structure for detecting a leak, wherein the structure is supported upon a supporting surface, the structure including a leak detector; and a bottom-facing surface comprising an inverted depression in which the leak detector is disposed, the inverted depression is configured to be suitable for inducing capillary actions in a liquid collected on the supporting surface, wherein when the inverted depression comes in contact with the liquid at its periphery, the liquid is drawn to the leak detector to be detected.

The purpose of the present invention is to provide a condensing boiler employing an eco-friendly evaporation device, in which condensed water generated in a latent heat exchanger is removed by using the evaporation device, so that the condensing boiler can be installed in a site without a processing facility for discharging condensed water and contribute to energy saving. For implementation thereof, the present invention comprises: a blower (110) for supplying a supply-air; a sensible heat exchanger (140) for absorbing combustion sensible heat generated in a combustion chamber (130) by combustion by a burner (120); a latent heat exchanger (150) for absorbing latent heat of steam included in combustion gas which has finished heat exchange in the heat sensible exchanger (140); and an evaporation device (160) which absorbs condensed water generated in the latent heat exchanger (150), and has an evaporation type humidifier (161) for evaporating and removing the absorbed condensed water by using air supplied from the blower (110).

The exhaust duct includes an exhaust collecting portion connected a heat exchanger and an exhaust guiding portion communicating with the exhaust collecting portion and extended upward in a state close to a side of a cylindrical body of the heat exchanger. The exhaust collecting portion includes a connection opening constituting an inner peripheral wall, into which a cylindrical outlet side connection portion at the lower end of the heat exchanger is fitted, and a groove provided on an outer peripheral side than the inner peripheral wall of the connection opening. The packing includes a seal portion sandwiched in a compressed state between the inner peripheral wall of the connection opening in the exhaust collecting portion and an outer peripheral wall of the cylindrical outlet side connection portion in the heat exchanger to constitute a seal and an anchor portion inserted into the groove of the exhaust collecting portion.

A heat exchanger unit according to the present invention comprises: a sensible heat exchanger including a sensible heat exchange pipe disposed in a sensible heat exchange area for heating water used for heating by receiving sensible heat generated by a combustion reaction, wherein the sensible heat exchange pipe receives the water used for heating and flows same through the interior, and a sensible heat fin disposed in the sensible heat exchange area, wherein the sensible heat fin is formed in a plate shape across the sensible heat exchange pipe and penetrated by the sensible heat exchange pipe; and a latent heat exchanger positioned downstream from the sensible heat exchange area on the basis of a reference direction, which is a flow direction of combustion gas generated during the combustion reaction, the latent heat exchanger including a latent heat exchange pipe disposed in a latent heat exchange area.

A heat-exchanger unit according to the present invention comprises: a sensible-heat heat-exchange portion arranged in a sensible-heat heat-exchange area for receiving sensible heat generated by a combustion reaction and thereby heating water, the sensible-heat heat-exchange portion having a sensible-heat heat-exchange pipe for receiving the water and causing same to flow through the interior thereof, thereby forming a sensible-heat channel along which the water flows; and a latent-heat heat-exchange portion positioned downstream of the sensible-heat heat-exchange area with reference to a first reference direction along which combustion gas generated during the combustion reaction flows, the latent-heat heat-exchange portion being arranged in a latent-heat heat-exchange area for receiving latent heat generated during a phase change of the combustion gas and thereby heating the water, the latent-heat heat-exchange portion having a latent-heat heat-exchange pipe for receiving the water and causing same to flow through the interior thereof.