Do you really know heat pump?

The most popular heat pumps are air source heat pump and ground source heat pump.And air source heat pump is more popular as it is freestanding and easy installation.

An Air Source Heat Pump is a unit that stands outside your home and is connected to your heating system. In a well insulated home, it can take the place of a central heating boiler.

Air Source heat pumps extract heat from the outside air. They are effective all year round (even at temperatures as low as -25°C) and in a well insulated home they can take the place of a central heating boiler. For residential heating systems they are at their most effective when used for lower temperature applications such as underfloor heating, but they can be configured to cope with heating most houses, whatever the age and type of property.

Air Source Heat Pumps are an eco-friendly and cheaper alternative to oil and are often installed in new build properties in areas where there is no mains gas. Properties that have an existing oil-fired boiler can benefit from the addition of an Air Source Heat Pump, as they can be easily incorporated into the heating system to improve efficiency and reduce running costs. High output, commercial air source heat pumps are also available. Air source heating systems, with multiple units linked together, can be designed for large scale installations, as an alternative to a ground source system, where groundwork is not practical.

Because air source units do not require any groundwork, installation is quick, easy and very cost-effective.

It seems heat pump is the most energy saving water heater nowadays.