A water heater and a method for heating water using various power sources and enhancing energy savings are disclosed. The water heater includes a first heating element within an inlet pipe. The first heating element draws energy from a first power source to heat water to a first temperature. The water heater further includes a second heating element within an outlet pipe. The second heating element draws power from a second power source to heat water from the first temperature to a second temperature. Optionally, when the second power source is unavailable or insufficient, then the second heating element draws power from a third power source to heat water from the first temperature to the second temperature.

A water heater and a method for heating water using various power sources and enhancing energy savings are disclosed. The water heater includes a first heating element within an inlet pipe. The first heating element draws energy from a first power source to heat water to a first temperature. The water heater further includes a second heating element within an outlet pipe. The second heating element draws power from a second power source to heat water from the first temperature to a second temperature. Optionally, when the second power source is unavailable or insufficient, then the second heating element draws power from a third power source to heat water from the first temperature to the second temperature.

In accordance with various embodiments of the present disclosure, a control system for a hybrid air heating system is provided. In some embodiments, the hybrid air heating system has at least one electric heating element capable of generating an electric thermal output and at least one burner capable of generating a combustion thermal output. In some embodiments, the control system comprises a controller configured to, based on a desired total thermal output of the hybrid air heating system, determine an amount of the desired total thermal output of the hybrid air heating system to be generated by the at least one electric heating element and an amount of the desired total thermal output of the hybrid air heating system to be generated by the at least one burner.

The present invention relates to an energy management system for a building, comprising at least one heat pump, at least one first thermal energy storage device for providing domestic hot water, at least one second thermal energy storage device for providing space heating, at least one renewable energy generation device, at least one first state of charge analyser for determining the state of charge of the at least one first thermal energy storage device, at least one second state of charge analyser for determining the state of charge of the at least one second thermal energy storage device, and a controller configured to control the at least one heat pump, the at least one first thermal energy storage device, the at least one second thermal energy storage device, and the at least one renewable energy generation device. The controller is configured to control, in dependence on at least the state of charge of the at least one first thermal energy storage device and/or the state of charge of the at least one second thermal energy storage device, whether one of and which of the at least one first thermal energy storage device and the at least one second thermal energy storage device is charged with energy provided by (a heat pump operation of) the at least one heat pump and/or energy provided by the at least one renewable energy generation device. Furthermore, the present invention relates to a method of using the energy management system.