Hello everyone,
For our planned new build, we have received two offers regarding a heating system.
The prices are almost identical. I do not want to post the complete technical descriptions yet.
Both are air-to-water heat pumps.
Offer A:
iPump A 2-7 heat pump, split system with inverter-controlled rolling piston compressor
The iPump A 2-7 includes a domestic hot water tank with a 200-liter (53-gallon) capacity
Heating performance at A2°/W35°C: Performance range (min/max): 2.06–7.55 kW
Nominal power / CoP: 3.90 kW / 4.42
Offer B:
Stiebel air-to-water heat pump WPL 17 ACS
Classic Flex Set
Heating capacity at A-7/W35 (EN 14511) 7.8 kW
Heating capacity at A2/W35 (EN 14511) 5.73 kW
Inverter-controlled air-to-water heat pump for outdoor installation
Stiebel buffer tank SBP 100, 100 liters (26 gallons)
Can anyone share any information about these two products? Any experience? The manufacturer iDM is completely unknown to me so far.
What surprises me a bit is the size comparison of the outdoor units. The iPump is almost twice as large as the Stiebel.
I would be very grateful for any feedback.
For our planned new build, we have received two offers regarding a heating system.
The prices are almost identical. I do not want to post the complete technical descriptions yet.
Both are air-to-water heat pumps.
Offer A:
iPump A 2-7 heat pump, split system with inverter-controlled rolling piston compressor
The iPump A 2-7 includes a domestic hot water tank with a 200-liter (53-gallon) capacity
Heating performance at A2°/W35°C: Performance range (min/max): 2.06–7.55 kW
Nominal power / CoP: 3.90 kW / 4.42
Offer B:
Stiebel air-to-water heat pump WPL 17 ACS
Classic Flex Set
Heating capacity at A-7/W35 (EN 14511) 7.8 kW
Heating capacity at A2/W35 (EN 14511) 5.73 kW
Inverter-controlled air-to-water heat pump for outdoor installation
Stiebel buffer tank SBP 100, 100 liters (26 gallons)
Can anyone share any information about these two products? Any experience? The manufacturer iDM is completely unknown to me so far.
What surprises me a bit is the size comparison of the outdoor units. The iPump is almost twice as large as the Stiebel.
I would be very grateful for any feedback.
A
Alessandro2 Nov 2020 14:38Is the supply temperature similarly high as in my system?
D
Daniel-Sp4 Nov 2020 18:27At what room temperature? 16°C (61°F) or 24°C (75°F)
:-)
:-)
Daniel-Sp schrieb:
At what room temperature? 16°C (61°F) or 24°C (75°F)
🙂 Currently 22.5°C (72.5°F)
N
neo-sciliar9 Nov 2020 12:25Here, there is always talk about lowering the supply temperature below 35° Celsius (95°F). I understand that. Are you referring to the standard supply temperature, or the supply temperature during the NAT (night setback)?
I had a discussion with the heating engineer from the construction company regarding this. I asked about lowering the supply/return temperature from 35/28°C (95/82°F), and he explained that these are the assumed values used in the thermal insulation calculations. In reality, the supply temperatures are around 28-30°C (82-86°F).
We are also in a new build situation, and it is really challenging. The general contractor specifies the heating system, and they have their preferred manufacturers. In our case, it’s currently Viessmann. He mentioned installing a Vitocal 200-S D09. Admittedly, according to the seasonal performance factor calculator, it has good figures for an air-to-water heat pump. Underfloor heating is being installed "according to the latest standards" – about 10cm (4 inches) spacing, all radiator circuit lengths equal, etc.
Nevertheless, the uncertainty remains.
Regards, sci
I had a discussion with the heating engineer from the construction company regarding this. I asked about lowering the supply/return temperature from 35/28°C (95/82°F), and he explained that these are the assumed values used in the thermal insulation calculations. In reality, the supply temperatures are around 28-30°C (82-86°F).
We are also in a new build situation, and it is really challenging. The general contractor specifies the heating system, and they have their preferred manufacturers. In our case, it’s currently Viessmann. He mentioned installing a Vitocal 200-S D09. Admittedly, according to the seasonal performance factor calculator, it has good figures for an air-to-water heat pump. Underfloor heating is being installed "according to the latest standards" – about 10cm (4 inches) spacing, all radiator circuit lengths equal, etc.
Nevertheless, the uncertainty remains.
Regards, sci
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