Disclosed herein are connectors for a tankless water heater. The connectors can comprise a flange, an aperture extending through the flange having a first diameter, one or more slots extending through the flange, a connector portion substantially surrounding the aperture and extending outward from the flange away from the tankless water heater. The aperture can correspond to an air inlet extending into the tankless water heater, and the air inlet can have a second diameter that is larger than the aperture. To keep the flange in place, the one or more slots can correspond to one or more fastening holes in the tankless water heater. The one or more slots can be substantially parallel and on opposite sides of the aperture. The connector can be in a secured state when the one or more slots are fastened to the one or more fastening holes.

A standoff assembly for use in terminating a plurality of resistive heaters disposed within a fluid vessel includes a pressure adapter plate, an electrical enclosure adapter plate, and a plurality of conduits. An end portion of each of the resistive heating elements extends through the pressure adapter plate. The electrical enclosure adapter plate is spaced apart from the pressure adapter plate to define a dry volume therebetween. The conduits are secured to the pressure adapter plate and the electrical enclosure adapter plate. Each conduit is aligned concentrically with each of the resistive heating elements. An electrical termination portion of each resistive heating element is disposed within the conduit.

A flow heater for new forms of vehicles. The flow heater comprises a passageway for liquid, a heating source, a swing mechanism arranged in the passageway, and a sensor for detecting a position of the swing mechanism. In some embodiments, the swing mechanism includes a flap and a stopper wherein the flap is hinged to an inner wall and the stopper is fixed to an inner wall and located to abut the flap in the absence of flow.

A freeze protection system is provided that includes a first valve configured to be coupled with an inlet of a water heater, such as a tankless water heater; a second valve configured to be coupled with an outlet of the water heater; and a valve actuator configured to automatically actuate the first valve and the second valve to permit water to drain from the water heater when (1) electric power is lost to the water heater, and (2) a temperature of a fluid in or around the water heater is less than or equal to a predetermined low temperature threshold.

The present application provides a water flow heating device with a protection function, including: a heating cylinder, a heating wire disposed in the heating cylinder and a water flow temperature sensor, and a protection circuit respectively connected with the heating wire and the water flow temperature sensor; the protection circuit includes a first voltage comparator, an environmental thermal conductivity detection circuit for detecting an environmental thermal conductivity of the water flow temperature sensor and a protection switch for switching on and off the heating wire; the water flow temperature sensor is connected with an input terminal of the first voltage comparator and the environmental thermal conductivity detection circuit, respectively; an output terminal of the first voltage comparator is connected with the protection switch; and the environmental thermal conductivity detection circuit is connected with an enable terminal of the heating wire. The present application can prohibit the heating wire from being turned on when the water flow is not full or slow, and can also cut off the power supply of the heating wire when an internal temperature of the heating cylinder is too high, thus improving the stability and safety of equipment operation.

Provides heating pump cover and heating pump, heating pump cover comprises: cover body, comprising flange plate and sealing piece, sealing piece is outside and integrally connected with flange plate, with cross-section stepped, flange plate comprises first surface and second surface arranged oppositely, first surface is for contacting with liquid, temperature control assembly, arranged on second surface, heating body, arranged on one side of first surface, and end of heating body penetrates flange plate, sealing and connecting flange plate, connecting to temperature control assembly by electric circuit. Arranging sealing piece on outer side of flange plate on cover body, with cross-section stepped, after being installed onto pump body, achieving multi-level snapping and sealing, effectively avoiding situation of liquid leakage happen at connecting portion between cover body and pump body due to aging or not tightly sealing, improving sealing performance and reliability of cover body installation.

Disclosed are a heating pump cover and a heating pump. The heating pump cover comprises a cover body, a temperature control device, a raised part, and a heating body. The cover body has a first surface configured to be in contact with liquid on which the heating body is arranged and a second surface opposite to the first surface on which the temperature control device and the raised part are arranged. The raised part forms grooves on the first surface and the temperature control device is arranged on the raised part. The part of the heating body locates in the grooves has a first region which is in contact with the inner wall of the groove and a second region which is arranged interval with the inner wall of the groove.

A liquid heater is described including a chamber for receiving a liquid, a pair of electrodes located within the chamber for applying electric current to the liquid, input terminals for connection to a power supply, a plurality of bi-directional switches for connecting the electrodes to the input terminals, and a control unit for controlling the switches. The power supply supplies an alternating voltage having a frequency no greater than 60 Hz, and the control unit controls the switches such that the electrodes are energised with an alternating voltage having a frequency no less than 150 kHz.

A swimming pool or spa may include hybrid heater. The hybrid heater includes an enclosure, a first heat source within the enclosure, and a second heat source within the enclosure. The first heat source may include an electric heater. A method of heating a swimming pool or spa using the hybrid heater includes receiving information about a desired temperature of the pool, determining an operating mode of the hybrid heater based on the received information, and controlling the hybrid heater pursuant to the determined operating mode.

A portable water heater assembly for heating water being dispensed into a drinking glass includes a base that has a fluid reservoir integrated within the base to contain a fluid and a fill port integrated into the base. A bottle is provided to contain water and the bottle is insertable into the fill port to direct the water into the fluid reservoir. A faucet is integrated into the base to dispense the water from the fluid reservoir. A heating element is integrated into the faucet and the heating element is in thermal communication with the faucet. The heating element heats the faucet when the heating element is turned on thereby heating the water when the water flows through the faucet.