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
Certainly much more than the 2-3 meters (6-10 feet) length of the pipe from the pump to the return line.
The issue is mainly to prevent incorrect operation, such as closing all ERR valves despite a heating demand (heating curve), from causing a short-term failure of the compressor.
Frequent cycling of the heat pump itself is not that harmful to the heat pump, but the problem occurs when a cycle is too short and the compressor does not get properly lubricated.
The issue is mainly to prevent incorrect operation, such as closing all ERR valves despite a heating demand (heating curve), from causing a short-term failure of the compressor.
Frequent cycling of the heat pump itself is not that harmful to the heat pump, but the problem occurs when a cycle is too short and the compressor does not get properly lubricated.
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RotorMotor25 Aug 2021 12:05As I understand it, the 50 liters (13 gallons) are mainly for defrosting in case all the valves are closed.
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Deliverer25 Aug 2021 12:26Both are correct.
If only there were a way to effectively prevent all room heating valves from closing... ;-)
If only there were a way to effectively prevent all room heating valves from closing... ;-)
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Daniel-Sp25 Aug 2021 14:14Simply remove the actuators in the heating manifold. This also saves electricity.
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Deliverer25 Aug 2021 14:25If only there were a way to effectively prevent all room heating valves from being closed while saving a lot of money at the same time… ;-)
No question, this is how I will do it, and I already told HSL that. However, the law requires ERR, Vaillant insists on it, and eventually I will be able to sell my house without having to explain why my heating system is not legally compliant or why the heat pump breaks down during the first winter after the sale.
Most people want to use the ERR anyway, so for now it will be installed for the average user. How I use it personally doesn’t really matter. As mentioned, the efficiency loss should be limited to the 50 liters (13 gallons) flowing through the return line.
Most people want to use the ERR anyway, so for now it will be installed for the average user. How I use it personally doesn’t really matter. As mentioned, the efficiency loss should be limited to the 50 liters (13 gallons) flowing through the return line.
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