Air-to-water heat pump sizing in new construction

with the size (50l?)

The hydraulic diagram was still lying on the buffer tank during the site visit just now. My paramedic really seems to want to play it safe, or he still had the thing lying around and it had to go.



We are getting the 75s and the smaller buffer tank with 45l would definitely be sufficient. He probably thought, "he comes here with his strange calculations, that will never work. I'll install a proper buffer tank so I don't have any problems later"...

I read all the harsh words aimed at me, like "buffer tank", "individual room control valve", and "bypass valve" ;)

Buffer storage in the return flow is not a disaster and the overcurrent valve can be closed and ERR deactivated. It will be fine!

It's just a bit of a shame. I would have to work for four months for that...

It's just always a bit of a shame. I would have to work for four months for that...

But that's below minimum wage in all cases..... The buffer tank costs around 600€ on the internet?

Do you have a plumber who will install it for you? For free? And the additional piping costs nothing? And the temperature sensors are just lying around? And the cables to them pull themselves? And the actuators are available on ebay? People, this is a huge, expensive pile of crap that is installed millions of times every year in houses. And once again, only the industry benefits. It costs us money at the beginning AND then over many years. And it harms the environment.

You can get exempted and you should urgently do so. If the heating was (truly) calculated beforehand, no one needs this. I have a new building and an uninsulated old building – in both I have constant temperatures and no ERR.

huge, expensive pile of shit

Well, my pile of shit is about 1m high and has a total of 1m of hose including wiring and accessories. Estimated costs around €800.

My world does not collapse because of that, as I tried to prevent it and failed. Now my focus is on using my energy much more productively, for example when choosing the landscaping contractor. If the general contractor assigns me a heating engineer and this engineer installs a heating system without a buffer, I only have the alternative to take it out of the construction scope and contract it myself. That costs me at least more stress and complications.

Riding on the buffers and ERR only helps to a limited extent, since I already had all these discussions a year ago. I have devoted myself intensively to the battles I can also win.