ᐅ Which type of storage tank is suitable for an air-to-water heat pump?
Created on: 11 Apr 2016 22:52
T
tabtab
Hi,
how large should a domestic hot water tank be for an air-to-water heat pump? Is a separate buffer tank for the heating system necessary? I think I once read that ideally you should avoid using a tank at all, because only then does the air-to-water heat pump operate at maximum efficiency. Is that true or nonsense? What do you recommend? And does coupling it with a thermal storage tank connected to a wood stove make sense to support heating during winter?
how large should a domestic hot water tank be for an air-to-water heat pump? Is a separate buffer tank for the heating system necessary? I think I once read that ideally you should avoid using a tank at all, because only then does the air-to-water heat pump operate at maximum efficiency. Is that true or nonsense? What do you recommend? And does coupling it with a thermal storage tank connected to a wood stove make sense to support heating during winter?
tabtab schrieb:
Our heating engineer recommends a 200-liter (53 gallons) buffer tank for the 300-liter (79 gallons) domestic hot water tank, arguing that the heat pump will run more efficiently and cycle less frequently.Yes, it IS more challenging to design and configure a heat pump system to run reliably without a buffer tank. Not every heating professional can do this, which is why he wants to sell you a buffer tank. "I can’t do it any other way and we’ve always done it like this."
Of course – if the system runs unreliably, he faces a warranty claim. If the system runs inefficiently, he doesn’t care because you pay the electricity bill.
S
Sebastian7924 Jun 2016 08:34We had to install a return buffer tank – there was quite a fuss about it in the pink forum.
Sebastian79 schrieb:
We had to install a return buffer tank – it caused quite a stir in the pink forum. That makes me curious, why was it necessary? What was the technical reason?
S
Sebastian7924 Jun 2016 09:07Specification in Vaillant’s system diagram – without this, no warranty.
The technical reason is that there must be a buffer tank if all the valves in the house are closed and the heat pump is still supplying heat.
I also found it unnecessary, as did my heating engineer, but Vaillant insisted on it. However, it doesn’t really cause any issues since it’s not a traditional upstream buffer tank. It just adds to material costs (the small unit costs just under 400 euros).
The technical reason is that there must be a buffer tank if all the valves in the house are closed and the heat pump is still supplying heat.
I also found it unnecessary, as did my heating engineer, but Vaillant insisted on it. However, it doesn’t really cause any issues since it’s not a traditional upstream buffer tank. It just adds to material costs (the small unit costs just under 400 euros).
S
Sebastian7924 Jun 2016 09:20We also don’t have any thermostats, and whether you actually receive anything in case of a warranty claim remains to be seen.
We asked explicitly several times...
We asked explicitly several times...
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