ᐅ Opinions on the offer...

Knee wall.
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I hope this isn’t too much for you!

ypg schrieb:

- 150L hot water storage tank (or 171L)... a few years ago, the standard was still 300L...

That’s fine, since with a heat pump the water temperatures are lower, a smaller tank is better for hygiene. Only if you really need a lot of hot water in one go every day would 300L be useful (for example, a large bathtub plus showers afterward). I would rather try to get rid of the buffer tank because it continuously increases electricity consumption and serves no purpose if individual room temperature control is not used (which is recommended).

This is too much for me... I think only a building professional who charges a fee will notice the latent errors anyway.

boxandroof schrieb:

That's fine, with a heat pump the water temperatures are lower, so a small storage tank is better for hygiene.

Then it's 171 liters (45 gallons). All good.

150 liters (40 gallons) are too little for gas plus solar, but the general contractor offers it.
And that shows that you really need to check everything carefully.

No problem, I don’t expect the walls to be taken apart here either! But maybe there are a few small obvious things that a layperson wouldn’t notice! This is just the first offer, and it’s nice to hear other experiences or opinions as well. I don’t expect anyone to check the plans thoroughly! We also understand that we would have a professional review such a building specification later on.