ᐅ Is a buffer tank useful for a heat pump?

Is a buffer tank generally a worthwhile investment for a heat pump? Or is it highly recommended or even essential?

Is a buffer tank in my case a worthwhile investment? Or is it highly recommended or even essential?

My configuration is:
170 sqm (1829 sq ft) heated area
Energy standard: nearly KfW-55
Ground source heat pump, 3-12 kW modulating
Optimal heat pump size according to calculation: 8 kW
5 household members
Mainz

jx7 schrieb:

Is a buffer tank in principle a sensible investment when using a heat pump? Or is it even strongly recommended or absolutely necessary?

Is a buffer tank in my case a sensible investment? Or is it even strongly recommended or absolutely necessary?

My configuration is:
170 sqm (1830 sq ft) heated area
Energy standard: nearly KfW-55
Ground source heat pump 3-12 kW modulating
Optimal heat pump size according to calculation: 8 kW
5 residents
Mainz

Hello,

to my knowledge, you can skip it. The screed in the house is a very large thermal storage medium and should be sufficient as a buffer.

bortel schrieb:

Hello,

to my knowledge, you should leave it out. The screed in the house is a very large storage medium and should be sufficient as a buffer.

As far as the underfloor heating is concerned, that may be true. But what about the domestic hot water preparation?

Before things get confusing here:

A buffer tank is part of the heating system. It has nothing to do with screed, but rather ensures that the heat pump can offload its output if needed (keyword: high-pressure fault).

Domestic hot water is stored in a potable water tank.

Now, let's get to it: how is the hot water produced? Through the heat pump, of course. Is it a separate tank, a combined tank, or a "combo module"?

Rübe1 schrieb:

Before this turns into a mess:

A buffer tank is part of the heating system. It has nothing to do with screed, but rather allows the heat pump to offload surplus power if needed (keyword: high-pressure fault).

Domestic hot water is stored in a separate domestic water tank.

And now to the point: how is the hot water generated? Via the heat pump, of course. Is there a separate tank for that, a combined tank, or a "combo module"?

We have a domestic hot water tank with a capacity of 165 liters (approximately 44 gallons). (Is this too small for 5 people?)

Would a buffer tank be installed only between the heat pump and the underfloor heating? And the domestic hot water would remain connected directly to the heat pump?

Or is the buffer tank installed between the heat pump on one side and both the underfloor heating and the domestic hot water on the other side?

OK, I have since learned that there are buffer tanks for the heating system and combined tanks ("with fresh water station") that serve both heating AND hot water.

What would be recommended for us?

Would a stratified tank be advisable?

The goal is for the heat pump to operate evenly and to prevent frequent start/stop cycles.