ᐅ Heat pump: what are the experiences with different buffer tank sizes?

Created on: 24 Jun 2010 09:25
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svuja2804
S
svuja2804
24 Jun 2010 09:25
Hello,
we are currently building a detached house with 180m² (1,940 sq ft) of living space in Bavaria.
We are having an air-to-water heat pump installed, as well as a hydronic stove to additionally generate hot water.

Our construction company said that an 800-liter (210-gallon) tank is completely sufficient, and this has been planned accordingly.

However, another stove installer now says that this is far too small, and that if there are a few cold days, we will have problems and won’t get properly hot water. He also mentioned that a hydronic stove only causes unnecessary costs instead of providing any real benefits.

Does anyone have experience regarding the size of the tank or the hydronic stove?
H
hausmausi
10 Feb 2011 21:17
hm.,
we were told that (there are 3 of us) a minimum of 300 L up to about 500 L would be sufficient.
Usually, people don’t bathe immediately one after another.
However, after bathing (about 200 L), there should still be at least 100 L left for showering.

The water will already be heated to around 60°C (140°F), which should be sufficient according to guidelines (bacteria protection, etc.) (especially for showering).