What is a heat pump boiler? A heat pump boiler is a modern and energy-efficient solution for producing hot domestic water. Instead of gas or a conventional electric boiler, a heat pump boiler uses heat extracted from the air. As a result, it consumes significantly less electricity and can save up to 70% on energy consumption for hot water. How does a heat pump boiler work? The operation is based on a heat pump circuit with four steps: 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, causing its temperature to rise significantly. Releasing heat to the water – The heat from the hot refrigerant is transferred to the water in the boiler via a heat exchanger. Cycle repetition – The refrigerant cools down, flows back, and the process starts again when hot water is needed. Advantages of a heat pump boiler Energy-efficient – Up to 3 to 4 times more efficient than a standard electric boiler. Sustainable – No gas required and significantly less CO₂ emissions. Cost-saving – Lower energy bills and often attractive subsidies. Flexible – Can be combined with solar panels or solar collectors for even higher yield. User-friendly – Compact system that combines heat pump and boiler in one. Considerations The purchase price is higher than that of a traditional boiler, but the investment pays off through lower energy costs. The unit makes some noise, comparable to a refrigerator, and is therefore often placed in a storage room, garage, or technical room. Sufficient air intake and exhaust are required for proper operation. The unit takes up somewhat more space than a standard electric boiler.