A heat transfer tube of a heat exchanger is provided with a first and a second annular convex portions of which outer diameters are partially expanded. The first annular convex portion is positioned on an inner face side of a side plate portion of a case of the heat exchanger and is engaged with a circumferential edge portion of a first hole portion provided for the side plate portion, or the first annular convex portion contacts under pressure with an inner circumferential face of the first hole portion. The second annular convex portion is positioned on an outer face side of a header constituting member and is engaged with a circumferential edge portion of a second hole portion. Thus the side plate portion, the heat transfer tube, and a header are relatively fixed by a simple means.

A boiler loop system including a primary-secondary piping loop interface apparatus including a flow diversion device, and a drain valve, and a drain port in branches from a circumferential sidewall. In an embodiment, supply branch piping and return branch piping connect the primary-secondary piping loop interface apparatus to a boiler and provide attachment points for auxiliary plumbing equipment. In an embodiment, the boiler loop is integrated into the primary loop.

A cold plunge water generation assembly for a tub enclosure that is capable of receiving water from an outside water source, chilling said water with an electric water cooling system to a temperature within a range of 33-45 F. and delivering said chilled water to a cold water storage tank for storage. The assembly includes a cold water pump fluidly coupled to the cold water storage tank and an electric controller communicatively coupled to the cold water pump, the electric water cooling system, and an electric display on the assembly, wherein the electric controller is operably configured to selectively initiate the water cooling system to chill incoming liquid for storage in the cold water storage tank and cause the cold water pump to induce a flow of the chilled liquid to the cold water supply conduit and out through the faucet coupled to the tub enclosure.

A cold plunge water generation assembly for a tub enclosure that is capable of receiving water from an outside water source, chilling said water with an electric water cooling system to a temperature within a range of 33-45 F. and delivering said chilled water to a cold water storage tank for storage. The assembly includes a cold water pump fluidly coupled to the cold water storage tank and an electric controller communicatively coupled to the cold water pump, the electric water cooling system, and an electric display on the assembly, wherein the electric controller is operably configured to selectively initiate the water cooling system to chill incoming liquid for storage in the cold water storage tank and cause the cold water pump to induce a flow of the chilled liquid to the cold water supply conduit and out through the faucet coupled to the tub enclosure.

A water distribution apparatus and method including cold and hot water supplies, a fan coil (or chilled beam device), a control valve having cold and hot water inlets and outlets, cold and hot water outputs configured to supply cold and hot water to the fan coil, cold and hot water return inlets configured to receive from the fan coil the water supplied by the cold and/or water outputs and outputting the cold and/or hot water to the cold and hot water supply lines, respectively, via the cold and hot water outlets, respectively. Cold and hot water is supplied from the cold and/or hot water outputs to the fan coil and received into the cold and hot water return inlets, respectively, and the cold and hot water supplied by the cold and hot water outputs to the fan coil is output to the cold and hot water supply lines, respectively.

A water distribution apparatus and method including cold and hot water supplies, a fan coil (or chilled beam device), a control valve having cold and hot water inlets and outlets, cold and hot water outputs configured to supply cold and hot water to the fan coil, cold and hot water return inlets configured to receive from the fan coil the water supplied by the cold and/or water outputs and outputting the cold and/or hot water to the cold and hot water supply lines, respectively, via the cold and hot water outlets, respectively. Cold and hot water is supplied from the cold and/or hot water outputs to the fan coil and received into the cold and hot water return inlets, respectively, and the cold and hot water supplied by the cold and hot water outputs to the fan coil is output to the cold and hot water supply lines, respectively.

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.

The invention relates to a valve (16) for installation on a water heater comprising a tank (19) with one single welded socket (17), and where cold-water by discharge is led into a connection for a supply pipe (1), through a check valve (4) and down through a cold-water pipe (5a) to the bottom of the tank (19). The hot water in the top of the tank (19) is forced out through a cavity (7) and out of the valve through a connection for a hot water delivery pipe (9). The valve (16) has a connection for a suction pipe (10) for connection to a circulation pump (24) sucking cold water from the bottom of the tank (19) to external heating, wherein the circulation pump (24) leads the consumption water of the tank (19) back to the valve (16) through a connection for a return pipe (11) and to the middle of the tank (19). The return pipe (11) is arranged to be used for return from the circulation pipe between the tank (19) and a hot water cabinet (28).

A water system that includes a prefabricated fitting tee for use with a water heater. The prefabricated fitting tee includes a fitting tee body that has a first, second, and third port. The first and third ports are aligned along a main axis and the second port is aligned along an axis angled relative to the main axis. The fitting tee body defines an interior passageway that is in fluid communication with the first, second, and third ports. One of the first and second ports connects to a water inlet conduit for supplying water from an external source, the other one of the first and second ports connects to a pressure relief or pressure absorption mechanism. A swivel nut is rotatably mounted at the third port of the prefabricated fitting tee to provide an interconnection to the water heater.

A water system that includes a prefabricated fitting tee for use with a water heater. The prefabricated fitting tee includes a fitting tee body that has a first, second, and third port. The first and third ports are aligned along a main axis and the second port is aligned along an axis angled relative to the main axis. The fitting tee body defines an interior passageway that is in fluid communication with the first, second, and third ports. One of the first and second ports connects to a water inlet conduit for supplying water from an external source, the other one of the first and second ports connects to a pressure relief or pressure absorption mechanism. A swivel nut is rotatably mounted at the third port of the prefabricated fitting tee to provide an interconnection to the water heater.