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
H
Hausbau 553 Nov 2021 18:37Right, so should I identify the weakest point, meaning the room, in the heating load calculation? How do I find it?
R
RotorMotor3 Nov 2021 18:40Hausbau 55 schrieb:
Right, so in the heating load calculation, should I identify the weakest point, meaning the room? How do I find it? What kind of calculation did you receive?
Are there any under- or over-dimensions specified?
Before we chose wall heating, for example, the bathroom showed a deficit [W]: 353
In the widely used Excel version, it then showed: surplus [W]: -353
H
Hausbau 553 Nov 2021 19:19RotorMotor schrieb:
What kind of calculation did you receive?
This is how it looks for us. Which room would be problematic?
R
RotorMotor3 Nov 2021 19:33Hausbau 55 schrieb:
This is how it looks for us. Which room would be problematic? Overall, it looks quite balanced.
The hallway is clearly overheated but that can be regulated by throttling.
The only room that is actually underheated is the guest room, so you could improve the supply by adjusting the floor covering there. 😉
Next is the bedroom, where being one degree lower wouldn’t bother me either.
After that, living/kitchen area, and then we already reach the bathroom, which has been somewhat “softened” here by setting it to 22°C (72°F) instead of the usual 24°C (75°F).
H
Hausbau 553 Nov 2021 19:44Thank you for your assessment.
The bedroom will also be throttled down; 21°C (70°F) is too much for us.
The bedroom will also be throttled down; 21°C (70°F) is too much for us.
A
Alessandro4 Nov 2021 08:08Is the room’s location taken into account in the heating load calculation (percentage of exterior walls)?
What is the nominal output of your heat generator?
What is the nominal output of your heat generator?