There is provided a water delivery system that includes, hot and cold water lines that are for feeding hot and cold water to respective hot and cold water fixtures, a water heater having a cold water input and a hot water output, a water circulator for pumping water from the hot water outlet to the hot water fixture, a bypass line that couples between the water circulator and the cold water input and at least a first check valve constructed and arranged in the bypass line for selectively directing hot pumped water via the water circulator to the cold water input to the water heater while preventing flow in an opposite direction toward the water circulator. A second check valve is disposed in the cold water line for selectively directing cold water from the cold water line to the cold water input to the water heater while preventing flow in an opposite direction toward the cold water line.

Refilling device (11) for a hydronic heating system, having a monolithic housing (21) providing an inlet port (22), an outlet port (23), a middle section (24) providing a flow channel for water extending between the inlet port (22) and the outlet port (23) and a connection socket (25) for a softening and/or demineralization cartridge (26), having an inlet shut-off-valve (27) accommodated within said monolithic housing (21) downstream of said inlet port (22), having an automatically actuated outlet shut-off-valve (28) accommodated within said monolithic housing (21) upstream of said outlet port (23), having a system separator (29) with backflow preventers (30, 31) accommodated within said monolithic housing (21), having a conductivity or TDS sensor (32, 33) accommodated within said monolithic housing (21), having a flow meter (35) accommodated within said monolithic housing (21), and having a controller (37) mounted to said monolithic housing (21), wherein the controller (37) receives signals from the conductivity or TDS sensor (32, 33) and from the flow meter (35), wherein the controller (37) processes said signals received from said sensors to automatically control the operation of the refilling device (11).

Refilling device for a hydronic heating system, having a monolithic housing providing an inlet port, an outlet port, a middle section providing a flow channel for water extending between the inlet port and the outlet port and a connection socket for a softening and/or demineralization cartridge, having an inlet shut-off-valve accommodated within said monolithic housing downstream of said inlet port, having an automatically actuated outlet shut-off-valve accommodated within said monolithic housing upstream of said outlet port, having a system separator with backflow preventers, a conductivity or TDS sensor and a flow meter accommodated within said monolithic housing, and having a controller mounted to said monolithic housing, wherein the controller receives signals from the conductivity or TDS sensor and from the flow meter, wherein the controller processes said signals received from said sensors to automatically control the operation of the refilling device.

A water heater dip tube includes an elongated body having an inlet end and an outlet end. An inner volume is arranged within the elongated body. An anti-siphon orifice is arranged along the elongated body proximate the inlet end. The anti-siphon orifice extends through a wall of the elongated body. The dip tube further includes an elastomeric membrane secured to the elongated body. The elastomeric membrane is arranged in the vicinity of the anti-siphon orifice. The elastomeric membrane is operable to block fluid flow through the anti-siphon orifice when a pressure at the inlet end is greater than a pressure at the exterior of the dip tube adjacent to the anti-siphon orifice, and to allow fluid flow through the anti-siphon orifice when a pressure at the inlet end is less than a pressure at the exterior of the dip tube adjacent to the anti-siphon orifice.

The present invention relates to a fluid circulation type heating device which circulates fluid by means of heating and cooling and, more particularly, to a fluid circulation type heating device provided with overpressure protection element which can prevent pressure increase of a circulation path of a fluid. The fluid circulation type heating device according to the present invention for achieving the aforementioned purpose comprises a circulation line, a heat radiation member installed on the circulation line, a boiler which heats and expands a fluid, a storage tank which stores the fluid therein and supplies the same to the boiler, a controller which controls the boiler, and a housing which accommodates the boiler and the controller. In addition, the device has an opening formed in fluid communication with the storage tank or the circulation line, and further comprises an overpressure protection element which blocks the opening, wherein the overpressure protection element is configured to prevent fluid from passing through and allowing a vapor of the fluid to pass through, thereby dropping the pressure of the storage tank and the circulation line. The fluid circulation type heating device according to the present invention discharges, to the outside, steam from the inside of a circulation path and does not discharge fluid to the outside, thereby preventing overpressure loaded onto the fluid circulation path of a heating device. In addition, should the heating device fall over, it is possible to prevent fluid from being discharged to the outside. Furthermore, it is possible to prevent external foreign material from being introduced into the circulation path, thereby preventing damages of components or generation of odor, due to contamination of fluid caused from the external foreign material.

A receiver, a receiver assembly and a heat pump system. The receiver includes a first pipe, a second pipe and a third pipe leading to the cavity of the receiver, wherein the first pipe, the second pipe and the third pipe connect to a first load unit, a second load unit and a cold and heat source unit, respectively.

A hot water circulation system comprises a water heater having a cold-water inlet and a hot water outlet. A water pump circulates water through the water heater to produce hot water. The hot water is circulated to a thermal bypass valve, which is configured to close when hot water contacts a heat activated seal. A bypass circuit is coupled between the hot water outlet and the cold water inlet of the water heater. The bypass circuit prevents hot water from circulating from the hot water outlet to the cold-water inlet when the thermal bypass valve is open and promotes circulating hot water from the hot water outlet to the cold water inlet when the thermal bypass valve is closed. Upon a temperature sensor sensing hot water entering the cold-water inlet, the water heater turns of the water pump.

A hot water supply system according to the present invention includes: a hot water supply unit configured to supply hot water; an opening and closing valve configured to connect a hot water supply pipe, which is configured to supply hot water to a user from the hot water supply unit, and a cold water supply pipe, which is configured to supply cold water introduced from a cold water inflow pipe to the user, to allow water to flow or configured to disconnect the hot water supply pipe from the cold water supply pipe to block the water from flowing; a circulation pump configured to circulate water supplied from the hot water supply unit through the hot water supply pipe, the opening and closing valve, the cold water supply pipe, and the hot water supply unit; and a control unit configured to, when a water-preheating signal of the user is input, open the opening and closing valve, and operate the circulation pump to preheat water which is to be supplied to the user.

A receiver, a receiver assembly and a heat pump system. The receiver includes a first pipe, a second pipe and a third pipe leading to the cavity of the receiver, wherein the first pipe, the second pipe and the third pipe connect to a first load unit, a second load unit and a cold and heat source unit, respectively.

A liquid heating system includes an instantaneous heater (18) having an inlet (20) connected to a reservoir (62). The outlet (22) of the heater is connected to fixtures (72) which use the heated liquid, and is also connected through a return connection (30) to the reservoir. In an idle mode, a pump 40 draws liquid from the reservoir (62), so that the liquid circulates through the heater and back to the reservoir. A controller (52) actuates the heater to heat the liquid to a first setpoint temperature, so that the liquid in the reservoir stabilizes at the first setpoint temperature. In a supply mode, some or all of the heated liquid flows from the outlet to the fixtures (72). Cold liquid is admitted from a supply (60) to the reservoir, and cold liquid desirably also is supplied to the heater inlet along with liquid from the reservoir, so that the heater inlet receives a combination of these. The controller controls the proportion of cold liquid to liquid from the reservoir in the combination, so as to maintain the heater at a setpoint heating rate while also maintaining the temperature of liquid discharged from the heater outlet at or near a setpoint temperature.