Hello everyone,
we are planning a prefabricated house using timber frame construction. It will have 180 sqm (1,937 sq ft) of living space with underfloor heating, and about 230 sqm (2,475 sq ft) of usable area.
So far, the offer included an air-to-water heat pump from Daikin (Altherma 3R, formerly Rotex HPSU compact Ultra).
Now it seems that this unit might not have enough capacity (?) and as an alternative (additional cost around 4,000) we have been offered a "Wolf heat pump CHC Monoblock 10/300-35".
The Daikin is available in the 4-9 kW version—would that really be insufficient for this size? And what do you think about this offer?
I have the energy-saving regulation heat protection certification and a renewable energy heat law document available, if any information from those is needed.
Thank you very much!
Best regards
we are planning a prefabricated house using timber frame construction. It will have 180 sqm (1,937 sq ft) of living space with underfloor heating, and about 230 sqm (2,475 sq ft) of usable area.
So far, the offer included an air-to-water heat pump from Daikin (Altherma 3R, formerly Rotex HPSU compact Ultra).
Now it seems that this unit might not have enough capacity (?) and as an alternative (additional cost around 4,000) we have been offered a "Wolf heat pump CHC Monoblock 10/300-35".
The Daikin is available in the 4-9 kW version—would that really be insufficient for this size? And what do you think about this offer?
I have the energy-saving regulation heat protection certification and a renewable energy heat law document available, if any information from those is needed.
Thank you very much!
Best regards
Tolentino schrieb:
with the size (50l?) The hydraulic diagram was still lying on the buffer tank during my site visit. My plumber really seems to want to be on the safe side, or maybe he just had it lying around and needed to get rid of it.
We are getting the 75 model, and the smaller buffer tank with 45l (12 gallons) would definitely be sufficient. He probably thought, "This guy is coming with his odd calculations, that will never work. I'll just install a proper buffer tank so I don’t have problems later"...
I’m already hearing all the harsh words about me, like "buffer tank," "zone valve," and "bypass valve" 😉
D
Daniel-Sp25 Aug 2021 19:43A buffer tank in the return line is not a disaster, and the overflow valve can be closed with the ERR function disabled. It'll be fine!
D
Deliverer25 Aug 2021 20:07It’s just a bit unfortunate. I would have to work for four months to afford that...
Deliverer schrieb:
It’s just a bit of a shame. I would have to work for four months for that...But in all cases, that is still below minimum wage... The buffer tank costs around €600 (about $650) online?D
Deliverer25 Aug 2021 20:25Do 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 pull themselves? And the actuators are available on eBay?
Guys, this is a huge, expensive mess that gets installed in houses millions of times every year. And once again, only the industry benefits. It costs us money upfront AND over many years. And it harms the environment.
You can get exempted, and you should definitely do so. If the heating system was properly calculated in advance, nobody needs this. I have a new build and an uninsulated old building – in both I have stable temperatures and no ERR.
Guys, this is a huge, expensive mess that gets installed in houses millions of times every year. And once again, only the industry benefits. It costs us money upfront AND over many years. And it harms the environment.
You can get exempted, and you should definitely do so. If the heating system was properly calculated in advance, nobody needs this. I have a new build and an uninsulated old building – in both I have stable temperatures and no ERR.
Deliverer schrieb:
huge, expensive pile of crap Well, my pile of crap is about 1m (3.3 ft) high and includes a total of 1m (3.3 ft) of piping including wiring and accessories. The estimated cost is around 800€.
That’s not the end of the world for me because 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 installer who installs the system without a buffer tank, I only have the option to take it out of the contract and hire someone myself. At least that costs me more stress and complications.
Arguing about buffer tanks and energy recovery systems only helps to a limited extent, as I already had all these discussions a year ago. I have invested my efforts into fights that I can actually win.
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