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
T
T_im_Norden13 Nov 2020 13:28Searching for vwl75/6 A returns 6 results, all leading to the Vaillant website from Austria with the technical datasheets.
T
T_im_Norden13 Nov 2020 13:31I did not check the annual performance factor.
T_im_Norden schrieb:
Searching for vwl75/6 A yields 6 results, all from Vaillant Austria’s website with the technical datasheets OWLer schrieb:
Normally, I’m not that bad at googling I officially take back what I said. 😀
But at least now I have a datasheet. Thanks for the hint. I also found the maximum flow rate you mentioned.
Unfortunately, that doesn’t help me much. A minimum power of 5.4 kW sounds quite high when I actually only need a maximum of 6 kW... I need to figure out where the optimum is between flow rate and low power output.
The installer will either install Vaillant or Daikin/Rotex. Unfortunately, Daikin outdoor units were rejected by my wife for aesthetic reasons. So somehow I have to find a suitable Vaillant unit for myself. 🙄
So, I received feedback from the engineering office regarding the smaller Vaillant unit. They increased the flow temperature from 33 to 33.5°C (91.4 to 92.3°F) and decreased the return temperature from 29 to 28.5°C (84.2 to 83.3°F), raising the temperature difference from 4 to 5 K.
Now the flow rates are lower, and the small Vaillant 75/6 A can deliver the required flow rate.
Let’s see how I can optimize this in the long run. It almost feels like an older building with a 34°C (93.2°F) flow temperature when I compare the benchmarks here with you. Our building structure with gables and bay windows, plus the many floor-to-ceiling windows, really seems to have an impact. However, I am hoping for significant solar gains in practice, which should allow me to lower the flow temperature over the years.
It’s just a shame that I can’t get the small 55/6, which would be perfect for our heating load, to reach an annual performance factor of 4.5…
Now the flow rates are lower, and the small Vaillant 75/6 A can deliver the required flow rate.
Let’s see how I can optimize this in the long run. It almost feels like an older building with a 34°C (93.2°F) flow temperature when I compare the benchmarks here with you. Our building structure with gables and bay windows, plus the many floor-to-ceiling windows, really seems to have an impact. However, I am hoping for significant solar gains in practice, which should allow me to lower the flow temperature over the years.
It’s just a shame that I can’t get the small 55/6, which would be perfect for our heating load, to reach an annual performance factor of 4.5…
T
T_im_Norden14 Nov 2020 11:38The 55 model is included in the list of eligible subsidies.
Arotherm plus VWL 55/6 A 230V S2
Arotherm plus VWL 55/6 A 230V S2
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