Abstract: Systems and methods for a heat pump water heater can include a heat pump water heater system having an evaporator, a condenser, a vapor injection line, a compressor, and a multi-fluid heat exchanger. The vapor injection line can include an expansion valve to transition refrigerant received from the condenser at a first pressure to a second pressure. The compressor can be configured to circulate refrigerant through the condenser, the multi-fluid heat exchanger, the vapor injection line, and the evaporator. The multi-fluid heat exchanger can be configured to receive refrigerant at a first pressure from the condenser, refrigerant at a second pressure from the vapor injection line, and water. The multi-fluid heat exchanger can further facilitate heat transfer between the refrigerants at the first and second pressures and the water to preheat the water before the water is passed through the condenser.

Abstract: A system for use with a fuel-burning water heater and a ventilation conduit is disclosed. The fuel-burning water heater is configured to burn fuel and generate gaseous exhaust and condensate from the burning of the fuel. The ventilation conduit is configured to remove the gaseous exhaust from the fuel-burning water heater. The system includes an input port configured to receive the gaseous exhaust and the condensate, a neutralizing material holder configured to house a condensate neutralizing material therein and to receive the condensate from the input port, a gas output port configured to provide the gaseous exhaust to the ventilation conduit, and a liquid output port configured to output condensate from the neutralizing material holder. The neutralizing material holder is disposed between the input port and the liquid output port.

Abstract: Systems and methods for a heat pump water heater can include a heat pump water heater system having an evaporator, a condenser, a vapor injection line, a compressor, and a multi-fluid heat exchanger. The vapor injection line can include an expansion valve to transition refrigerant received from the condenser at a first pressure to a second pressure. The compressor can be configured to circulate refrigerant through the condenser, the multi-fluid heat exchanger, the vapor injection line, and the evaporator. The multi-fluid heat exchanger can be configured to receive refrigerant at a first pressure from the condenser, refrigerant at a second pressure from the vapor injection line, and water. The multi-fluid heat exchanger can further facilitate heat transfer between the refrigerants at the first and second pressures and the water to preheat the water before the water is passed through the condenser.

Abstract: A condenser assembly is disclosed. The condenser assembly can include a condenser coil having a first portion and a second portion. The first portion can be configured to fluidly communicate with a first refrigerant line of a heat pump, and the first portion can have a plurality of windings defining an internal volume. The second portion can be configured to fluidly communicate with a second refrigerant line of the heat pump. The condenser coil can be configured to at least partially insert into an internal volume of a water heater tank.

Abstract: A heat pump water heater is disclosed herein. The heat pump water heater includes an outer casing and a water tank disposed within the outer casing. The water tank includes a top wall, a bottom wall, and a side wall extending between and connected to the bottom wall and the top wall and has a hot water outlet and a cold water inlet configured to enable water to flow into and out of the water tank. Additionally, the water heater includes a condenser heat exchanger surrounding at least a portion of the side wall, an insulation jacket disposed around at least the side wall and the bottom wall of the water tank and the condenser heat exchanger, a natural convection evaporator disposed about the side wall and employing no fan to direct heating medium to the refrigerant, and a compressor and tubing connected to the condenser heat exchanger and the natural convection evaporator.

Abstract: The disclosed technology includes systems and methods for a heat pump water heater. The disclosed technology can include a heat pump water heater system having an evaporator, a condenser, a vapor injection line, a compressor, and a multi-fluid heat exchanger. The vapor injection line can include an expansion valve to transition refrigerant received from the condenser at a first pressure to a second pressure. The compressor can be configured to circulate refrigerant through the condenser, the multi-fluid heat exchanger, the vapor injection line, and the evaporator. The multi-fluid heat exchanger can be configured to receive refrigerant at a first pressure from the condenser, refrigerant at a second pressure from the vapor injection line, and water. The multi-fluid heat exchanger can further facilitate heat transfer between the refrigerants at the first and second pressures and the water to preheat the water before the water is passed through the condenser.

Abstract: The disclosed technology can include a system for monitoring and detecting a fault in a fluid storage tank. A sensor can be located in, on, or proximate the fluid storage tank and can be configured to detect waveforms produced by the fluid storage tank in response to strain. The sensor can convert such waveforms into electrical signals and transmit such electrical signals in the form of vibration data to a controller. The controller can compare the vibration data to stored data, and based on such comparison, determine if a fault is present in the fluid storage tank.

Abstract: The disclosed technology can include a system for monitoring and detecting a fault in a fluid storage tank. A sensor can be located in, on, or proximate the fluid storage tank and can be configured to detect waveforms produced by the fluid storage tank in response to strain. The sensor can convert such waveforms into electrical signals and transmit such electrical signals in the form of vibration data to a controller. The controller can compare the vibration data to stored data, and based on such comparison, determine if a fault is present in the fluid storage tank.