How do heat pumps differ from boilers?
There are no gas or oil connections as they use renewable energy sources. They provide lower flow temperature water (up to 55oC generally) compared to a boiler (generally 70-82oC) and their capacity for supplying useful energy is dependent on input temperature from ground/air/water. Heat pumps are much more efficient (boiler can achieve no more than 100% efficiency) and have no compulsory annual servicing requirement.