What is a heat pump water heater? A heat pump boiler is a modern and energy-efficient solution for producing domestic hot water. Instead of using gas or a conventional electric boiler, a heat pump boiler uses heat extracted from the air. This results in significantly lower electricity consumption and energy savings of up to 70% for hot water production. How does a heat pump boiler work? Its operation is based on a four-stage heat pump circuit: Extracting heat from the air – A fan draws in air and transfers the heat to a refrigerant via an evaporator. Compression – The refrigerant is compressed, resulting in a sharp increase in temperature. Heat transfer to water – Heat from the hot refrigerant is transferred to the water in the water heater via a heat exchanger. Cycle repetition – The refrigerant cools, returns to the circuit and the process starts again as soon as hot water is needed. Advantages of a heat pump water heater Energy efficient – ​​Up to 3 to 4 times more efficient than a conventional electric water heater. Sustainable – Requires no gas and significantly reduces CO₂ emissions. Economical – Reduced energy bills and often attractive subsidies. Flexible – Can be combined with solar panels or solar collectors for even higher efficiency. Easy to use – Compact system that combines a heat pump and a water heater in a single device. Points to consider The purchase price is higher than that of a traditional water heater, but the investment is recouped through the reduction in energy costs. The device emits a slight noise, comparable to that of a refrigerator, and is therefore often installed in a storage room, garage or utility room. Sufficient air supply and exhaust are necessary for proper operation. The unit takes up a little more space than a standard electric water heater.