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
Yes, the specialist planner has since responded. The larger pipe is better for higher efficiency. However, this does not change the overall design. To reduce the total flow rate, he had to increase the temperature difference to 5K. The supply temperature is then 33.5°C (92.3°F). Not ideal, but we haven’t seen -12.4°C (9.7°F) in Berlin for a very long time…
I have now definitively decided on the 75 model heat pump. The heating engineer reviewed my heat load calculation and had Vaillant put together and offer the proposal again. Unfortunately, he also mentioned that Vaillant approved the 55 model heat pump for my build. However, that model does not meet the required annual performance factor for BAFA. He will not provide any values for BAFA certification based on a floor heating system that is not designed for it—keyword "repayment" under point 55 of the information sheet.
The additional cost for the Vaillant package compared to the standard Daikin Altherma 3 R heat pump and ZEWO ventilation with rotary heat exchanger is expected to be just over 7,000€ (around 7,000 euros), and it won’t be significantly less for the smaller heat pump. Unfortunately, this means the BAFA subsidy then overcompensates beyond the heat pump’s optimal size.
With this setup, I hope to live reasonably efficiently for more than 15 years. The plan is to carry out the ideal replacement procurement after achieving an optimal thermal balance.
Thanks to everyone who helped me! I will definitely provide feedback on how it performs in practice. 🙂
The additional cost for the Vaillant package compared to the standard Daikin Altherma 3 R heat pump and ZEWO ventilation with rotary heat exchanger is expected to be just over 7,000€ (around 7,000 euros), and it won’t be significantly less for the smaller heat pump. Unfortunately, this means the BAFA subsidy then overcompensates beyond the heat pump’s optimal size.
With this setup, I hope to live reasonably efficiently for more than 15 years. The plan is to carry out the ideal replacement procurement after achieving an optimal thermal balance.
Thanks to everyone who helped me! I will definitely provide feedback on how it performs in practice. 🙂
Schimi17914 Dec 2020 14:54OWLer schrieb:
... As long as it stays with the aroTherm plus, it can only be the 75 because of eligibility for subsidies. My heating engineer also prefers not to install split units, as he wants to switch to R290 in the future.Without having to read everything here, I have the following question: We are planning to upgrade our heating system soon (currently oil). The aroTherm has caught my attention, also because of the seasonal performance factor of 4.5. We have underfloor heating and two radiators. Are there any experiences with this model so far? Is this model suitable for areas with longer frost periods?
Schimi17914 Dec 2020 15:08OWLer schrieb:
...
Edit: I just noticed that he didn’t install underfloor heating in the tiled shower floor in the guest bathroom. I need to bring this up again.
...We were advised not to install underfloor heating in the shower because otherwise the pipes can dry out and develop unpleasant odors.T
T_im_Norden4 Dec 2020 15:11Strange argument, because if the pipes of the underfloor heating dried out, that would happen even without direct installation. The screed under the shower will also get warm without pipes being installed there.
Nonsense, if you shower more or less regularly, nothing will dry out there. However, there is a big difference between stepping onto cold or warm tiles when entering the shower.
So, I would definitely have the pipes installed inside the shower.
In this case, the heating engineer places strong emphasis on "can," but it doesn't necessarily have to be that way.
So, I would definitely have the pipes installed inside the shower.
In this case, the heating engineer places strong emphasis on "can," but it doesn't necessarily have to be that way.
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