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.
N
neo-sciliar9 Nov 2020 15:39tomtom79 schrieb:
I believe @Ötzi Ötztaler also runs 24.5 with a 1 degree hysteresis, from what I’ve read.
I myself operate my on-off heat pump at 27/22.And what are the flow temperatures of the underfloor heating in that case? At what outdoor temperature?Ötzi Ötztaler9 Nov 2020 17:24
tomtom79 schrieb:
I believe @Ötzi Ötztaler also runs 24.5 with a hysteresis of 1, as far as I have read.
I myself run my on-off heat pump at 27/22.Well, 24.5 / 22.5 / 0 is the setting in Alpha Innotec format. This means a target *supply* temperature of 22.5°C (72.5°F) at an outside temperature of 22.5°C (72.5°F), and about 27°C (81°F) (= 24.5 + 2.5 parallel shift) target supply temperature at -20°C (-4°F) outside temperature. The notation of the heating curve is somewhat specific in this case.
I keep relatively warm indoor temperatures of 22 to 24°C (72 to 75°F) and have a comparatively poor U-value of the wall at 0.21 W/(m²·K) in my KfW55 house, with pipe spacing of 10 to 15mm (0.4 to 0.6 inches) per axis of heating load. Unfortunately, some heating circuits are a bit too long, and certain rooms have poorly heat-conductive parquet flooring. So I’m probably not an ideal example. :-)
Nevertheless, the modulating heat pump runs pleasantly long and evenly at a reasonable supply temperature.
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