K
Knuschelpeter2 Nov 2020 07:37Hello 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.
D
Daniel-Sp2 Nov 2020 07:48What does the heat load calculation say then?
No, not what is stated in the energy certificate...
No, not what is stated in the energy certificate...
K
Knuschelpeter2 Nov 2020 08:07Neither offer includes it.
The supply temperature of the underfloor heating is 35°C (95°F) in both cases.
The supply temperature of the underfloor heating is 35°C (95°F) in both cases.
D
Daniel-Sp2 Nov 2020 08:26You need the heat load calculation to select the heat pump... Otherwise, have it prepared externally in advance!
Make sure there is no oversizing. Avoid combined storage/ mixing tank setups. Do not include solar thermal systems or hydronic stoves. No buffer tank in the heating circuit. Proper design of the underfloor heating system is essential for heat pumps; try to size it for temperatures below 35°C (95°F)!
Ensure the heat pump can modulate down to very low levels. You will rarely reach the nominal operating temperature (NAT), but temperatures around 0 to 5°C (32 to 41°F) occur regularly.
IDM manufactures reliable heat pumps; I am not sure about Stiebel. You can immediately exclude the 100-liter (26.4 gallon) heating circuit buffer offered by Stiebel.
Research the effectiveness of mechanical ventilation with heat recovery (MVHR) in new buildings and draw your own conclusions. If you absolutely do not want to do without it, consider using gas instead…
Make sure there is no oversizing. Avoid combined storage/ mixing tank setups. Do not include solar thermal systems or hydronic stoves. No buffer tank in the heating circuit. Proper design of the underfloor heating system is essential for heat pumps; try to size it for temperatures below 35°C (95°F)!
Ensure the heat pump can modulate down to very low levels. You will rarely reach the nominal operating temperature (NAT), but temperatures around 0 to 5°C (32 to 41°F) occur regularly.
IDM manufactures reliable heat pumps; I am not sure about Stiebel. You can immediately exclude the 100-liter (26.4 gallon) heating circuit buffer offered by Stiebel.
Research the effectiveness of mechanical ventilation with heat recovery (MVHR) in new buildings and draw your own conclusions. If you absolutely do not want to do without it, consider using gas instead…
T
T_im_Norden2 Nov 2020 08:26More important than the heat pump is the design of the underfloor heating system; the heat pump can be replaced, but the underfloor heating cannot.
A supply temperature of 35°C (95°F) is too high for me; I would design for 30°C (86°F).
Haha, Daniel was faster.
A supply temperature of 35°C (95°F) is too high for me; I would design for 30°C (86°F).
Haha, Daniel was faster.
Maintain a 7cm (3 inches) installation spacing in the bathroom.
Do not assume room temperatures of 20 degrees Celsius (68°F); rather, plan for around 22 degrees Celsius (72°F).
If you have a large bathtub and a rain shower, then please use a hot water storage tank of more than 200 liters (53 gallons), preferably a fresh water storage tank, but not exceeding 300 liters (79 gallons).
Do not assume room temperatures of 20 degrees Celsius (68°F); rather, plan for around 22 degrees Celsius (72°F).
If you have a large bathtub and a rain shower, then please use a hot water storage tank of more than 200 liters (53 gallons), preferably a fresh water storage tank, but not exceeding 300 liters (79 gallons).
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