A heat-pump using apparatus includes a refrigerant circuit, a heat medium circuit, and a heat exchanger which causes heat exchange to be performed between refrigerant and a heat medium. A main circuit of the heat medium circuit includes a branching part and a joining part. To the main circuit, a pressure protection device and a refrigerant leakage detecting device are connected. The pressure protection device is connected to a connection part located between the heat exchanger and one of the branching part and the joining part in the main circuit. The refrigerant circuit includes a first blocking device and a second blocking device between which the heat exchanger is located.

The present disclosure is directed to a mechanical and powerless leak detection and shutoff system that may be used in any commercially available water heater, e.g., both gas and electric. The system includes a spring-loaded shutoff assembly having a valve member operatively coupled to a fluid inlet line of the water heater. A handle of the shutoff assembly is maintained in an open configuration via a latching mechanism until a force is applied to cause the latching mechanism to release the handle and actuate the valve member to shutoff fluid flow through the fluid inlet line. The shutoff assembly is operatively coupled to a leak detection assembly via a cable. The leak detection assembly uses a fluid-soluble material that dissolves when exposed to fluid to thereby pull the cable to apply the force to disengage the latching mechanism.

A tankless water heater for heating a continuous supply of water. The tankless water heater includes a housing, a water inlet and outlet ports, a heater assembly located within the housing and defining a water flow path having a heating element located therein and being coupled to the water inlet and outlet ports. A flow sensing device measures the water's flow condition between the water inlet and outlet ports. The water heater further includes a leak detection system having a water collection area defined by a portion of the housing, a water sensor configured to detect the presence of water in the collection area and being coupled to a water stoppage valve that is moveable between an open position and a closed position in response to a signal from the water sensor indicating water being present in the water collection area.

A tankless water heater for heating a continuous supply of water. The tankless water heater includes a housing, a water inlet and outlet ports, a heater assembly located within the housing and defining a water flow path having a heating element located therein and being coupled to the water inlet and outlet ports. A flow sensing device measures the water's flow condition between the water inlet and outlet ports. The water heater further includes a leak detection system having a water collection area defined by a portion of the housing, a water sensor configured to detect the presence of water in the collection area and being coupled to a water stoppage valve that is moveable between an open position and a closed position in response to a signal from the water sensor indicating water being present in the water collection area.

A condensate neutralizer device for treating a condensate flow, the condensate neutralizer device includes a compartment adapted to receive condensate neutralizing materials therein, the compartment having an inlet end and an outlet end, a plurality of apertures disposed only on a bottom surface of each of the inlet end and the outlet end of the compartment. The compartment is configured to receive the condensate flow traversing upwardly through the plurality of apertures at the inlet end in a direction from the inlet end to the outlet end through the condensate neutralizing materials before allowing a treated flow of the condensate flow to traverse downwardly through the plurality of apertures at the outlet end to exit the compartment as an effluent.

A water heater includes a leak detection system. The leak detection system includes a leak sensor assembly that is disposed in a bottom pan of the water heater. The leak sensor assembly includes a sensor housing that has a sensor channel that is formed therein such that the sensor channel is disposed at an elevation from a base of the bottom pan when the sensor housing is disposed on the base of the bottom pan. Further, the leak sensor assembly includes a leak sensor that is disposed in the sensor channel of the sensor housing. The leak sensor detects water that leaks from the water heater and accumulates in the bottom pan when a level of the water in the bottom pan rises to the elevation of the sensor channel and the leak sensor that is disposed therein.

Provided is a heat pump use apparatus, including a refrigerant circuit, a heat medium circuit, and a heat exchanger configured to exchange heat between refrigerant and a heat medium. A main passage of the heat medium circuit includes a branching portion and a joining portion. A pressure protection device and a refrigerant leakage detection device are connected to the main passage. The pressure protection device is connected to the main passage at a connecting portion located between the heat exchanger and one of the branching portion and the joining portion. A first interruption device configured to be able to interrupt a flow from the heat exchanger to the connecting portion is provided in the main passage at a portion between the heat exchanger and the connecting portion. A second interruption device configured to be able to interrupt a flow from the heat exchanger to an other of the branching portion and the joining portion is provided in the main passage at a portion between the heat exchanger and the other of the branching portion and the joining portion.

A liquid tank device comprises a tank housing for storing a liquid within a tank volume inside of the tank housing, whereby the tank housing comprises at least one conduit opening that can be connected in a liquid-tight manner to at least one conduit for the liquid such that the liquid can be supplied to or removed from the tank volume within the tank housing through the conduit opening. A method for warning of and avoiding critical operating conditions of a liquid tank device comprises the detection of a tilting of the tank housing by means of a tilt detection device. The tank volume is shut off from the at least one conduit by means of a closing device if a tilt information from the tilt detection device exceeds a preset tilt value, resulting in avoiding further flow of liquid into or from the tank volume through the at least one conduit after detecting the tilting of the tank housing.

The present disclosure provides a device and a method for detecting leak in a tankless water heater. According to the present disclosure, a leak detection device is disposed on a base of the tankless water heater. The leak detection device includes a leak sensor and at least one absorption arm extending from the leak sensor. The absorption arm wicks water and transports the wicked water towards the leak sensor. The leak sensor generates a signal indicative of leakage in the tankless water heater, in response to sensing wetness.

A water heater with a leak detection system includes a leak sensor assembly that is disposed in an insulation cavity between an inner storage tank and an outer protective jacket of the water heater. The leak sensor assembly is configured to detect water that leaks from the storage tank. Further, the water heater includes a barrier that is disposed in the insulation cavity and wrapped around the inner storage tank to channel the water that leaks from the storage tank towards the leak sensor assembly, and prevent the water that leaks from the storage tank from flowing through an insulation material that is disposed in the insulation cavity.