A draft inducer blower assembly includes a blower having a fan, a dilution air intake passage, an exhaust gas intake passage, and a discharge passage. The blower is configured to operatively connect to a heater system in a manner to facilitate flow of combustion air into a combustion chamber and to draw dilution air into the blower and to mix the dilution air with the exhaust gases and to facilitate flow of the mixed air and exhaust gases through the vent. The dilution air intake passage is positionable in at least a low flow configuration and a high flow configuration. The dilution air intake passage is more restrictive of intake of dilution air in the low flow configuration than in the high flow configuration.

Tank (1) comprising a chamber (2) to receive liquid, a shell (3) surrounding the chamber (2) and a resistive electric element (13) that can be positioned inside the chamber (2). The tank comprises two orifices (5, 6) facing each other, one of them (5) formed in the chamber (2) and the other (6) in the shell (3) and connected by a casing body (7) comprising a bottom (8) and a peripheral side wall (9), the casing body (7) and the chamber are made of a synthetic material, the casing body (7), of which the bottom (8) is holed, forms a connecting sleeve connecting said orifices (5, 6) to one another, the hole in the bottom (8) is externally bordered by a rim to form a tubular projection (12) inserted into the orifice (5) of the chamber (2), and the resistive electric element (13) takes the form of an elongate body fitted with a seal configured so that, in collaboration with the resistive electric element (3), it seals the hole.

The invention is a double-circuit electric boiler for boiling a warming heat-carrying agent and a residential hot water. A hot water supply circuit first container and a second container with an electric heater for the heat-carrying agent of a warming circuit are arranged in a housing. Outer surfaces of inner walls of the warming circuit second container are in a contact with the water of the hot water supply circuit inside the first container. The electric heater for the heat-carrying agent is isolated by the second container walls from a contact with the water of the hot water supply circuit inside the first container. Both containers have separate inlet and outlet ducts and separate isolated temperature sensors. In a second embodiment of the boiler, an electric heater having heating areas isolated by the inner walls of the second container is further mounted in the first container.

A safety system and method to prevent water within a top portion of a tank of an electric water heater to drop below a safe temperature during a load shedding period, other than a full emergency grid failure, by a power provider whereby to prevent the propagation of harmful bacteria in a top portion the tank. A control device monitors the water temperature in the top portion of the tank by the use of a temperature sensor. If the control device detects a temperature of the water in the top portion of the tank inferior to 140 degrees F., it will by-pass the instructions of the power provider and connect power to one or more of the resistive heating elements of the tank until a predetermined temperature above 140 degrees F. is attained before switching off the resistive heating elements.

A boiler system having a generally cylindrical housing or shell includes a main or fire tube with a furnace or combustion chamber extending longitudinally near the bottom of the housing and a burner to accomplish combustion within the combustion chamber. The combustion chamber opens at its rear end to furnace tube sheet, and to a first set of tubes extending longitudinally of the boiler. The first set of tubes extends to and through the rear tube sheet of the boiler to a turnaround space, which transitions to a second set of tubes located above the combustion chamber and first set of tubes to generally span a length extending from the rear tube sheet of the boiler to the front tube sheet. The boiler system as disclosed has a reduced size while maintaining efficiency in steam and hot water applications.

A water heating tank is provided comprising a reservoir with a cold water inlet into the reservoir and a hot water outlet from the reservoir. The water heating tank further comprises a heater enclosure located within the reservoir. The heater enclosure encloses at least part of a heater. The heater enclosure has an inlet, a vent and an outlet. The water heating tank further comprises a duct connected to the outlet of the heater enclosure. The duct has an exit located in an upper portion of the reservoir.

A water heating system including a tank at least one of an electric heating element and/or a heat pump assembly for heating the water in the tank and a controller operatively coupled to the at least one of an electric resistance heating element and/or a heat pump assembly configured to control operation of the water heating system is disclosed. The controller is configured to gather information comprising at least one of user preferences for the system, specifications for energy related systems of a home in which the water heating system is installed, specifications for how the water heating system is physically configured within the home, environmental parameters for a location in which the water heating system is installed, and is configured to process this information to control the water heater system to operate according to the information.

An improved boiler apparatus having multiple resistive heating elements are provided with fixed resistances that can be rewired to allow dual voltage capability and at the same time, reduced watt density. For 120 V operation, the large diameter 9 ohm coil is used alone to provide the lowest possible watt density. For 240 V operation, all three heating coils are wired in series, creating a low watt density but high wattage heater.

A heat pump boiler is disclosed. The heat pump boiler includes a compressor. The heat pump boiler further includes an exterior heat exchanger that is configured to transfer heat between refrigerant and exterior air. The heat pump boiler further includes an interior heat exchanger that is configured to transfer heat between refrigerant and water. The heat pump boiler further includes a channel change valve that is configured to provide refrigerant compressed by the compressor to the exterior heat exchanger or the interior heat exchanger. The heat pump boiler further includes a first boiler heat exchanger that is configured to heat water that has passed through the interior heat exchanger from heat generated through combustion. The heat pump boiler further includes a second boiler heat exchanger that is configured to transfer heat between refrigerant and gas discharged from the first boiler heat exchanger.

An apparatus includes a high-pressure tank, a controller, a valve, controlled by the controller, and a heater.