An indispensable device for equipping every boiler room with a heat pump is the hot water tank . A tank with a heat exchanger with an enlarged surface should be selected to ensure efficient heat absorption. This ensures the smooth operation of the heat pump both in summer and during the heating season.
Another key element is the heating water buffer tank. This is particularly necessary for radiator installations , as it protects the system from cooling down during the reversing operation of the heat pump in the defrosting process. The buffer tank also serves as a hydraulic switch with heat storage and thus ensures a constant supply of hot water, regardless of the external and internal conditions of the building. This is particularly important for underfloor heating systems with thermo-electric valves, where many heating circuits can be closed when there is no heat demand.
The heating water buffer tank
Since heat pumps work in a closed system , a membrane expansion vessel is required in each boiler room. A three-way zone valve with a drive is used to connect the hot water tank to the heating water buffer tank . This device controls the flow of heating water between the heating system and the heat exchanger in the hot water tank. As a rule, the heat pump control system has prioritized hot water preparation. Once the target temperature of the domestic water is reached, the flow is switched to the heating water buffer tank to continue heating the room.

pump groups
To complete the boiler room, pump groups are included that transport the heat from the heating water buffer tank to the radiators or the underfloor heating distributor. Pump groups consist of a circulation pump, ball/check valves with thermometers and, depending on the model, can be equipped with a mixing valve with drive. If there are several heating circuits, the pump groups are connected via a hydraulic distributor. As with boilers, the remaining control, safety, shut-off and measuring fittings are also necessary for heat pumps.
From an economic point of view, when comparing the cost of equipping a boiler room with a heat pump versus other heat sources, it should not be forgotten that no chimney is required. This can save considerable costs. In addition, when using a heat pump, compared to solid fuel boilers, the cost of storing fuel is eliminated, which can further reduce the cost of building the house.