Fireplace with heat recovery

Forget about it with a heat pump - that only leads to problems and cycling. With gas it works... I would rather go for a water-bearing fireplace?

What exactly for problems?

You need a buffer tank, which a heat pump generally has difficulty handling - it usually starts to short cycle, reacts sensitively to stratified loading in the tank.

The efficiency and thus the seasonal performance factor decrease, and basically you are only causing costs.

In short...

You need a buffer tank, which is generally difficult for a heat pump to handle - it usually starts short-cycling, reacts sensitively to layered charging in the tank.

The efficiency and consequently the annual performance factor decrease, and in principle you only incur costs with it.

In short...

Good morning

can you please explain that in more detail?

Olli

Why large volumes of water in buffers lead to short run times (cycling) of the heat pump and therefore a reduction in efficiency must be feared.

You have to set the flow temperature higher to charge the storage. As a result, the heat pump has to cycle repeatedly to fill the surplus storage. The storage also has losses and is not cheap.

There was also a study by the Fraunhofer Institute that nicely showed that efficiency decreases with a buffer.