Macallan
2015-09-29 08:31:51
- #1
Hello everyone,
I need an analysis of the offer from our heating installer. I’m not quite sure that the configuration makes 100% sense.
Key data:
- 211 sqm living area (2 semi-detached houses, one larger with utility room, one smaller as a rented part, no basement)
- completely underfloor heating, 35°C flow temperature
- standard outdoor temperature -14°C, bivalence point -15°C, annual full load hours 1859
- heat demand (based on specific heat demand): 4.8 kW (specific heat demand 21.82 W/m2)
- annual energy demand: 8920 kWh
- water preparation for 7 people (max! currently 4, foreseeable 6), 30l per person
- no rain shower, normal bathtubs (which are hardly used)
Two different air-to-water heat pumps are offered. (For info: drilling is not possible/economical --> water protection area, trench collector also not possible).
- Hautec HWL-AS-52-AL (9.9 kW), combined storage tank 300/80 l
--> optionally with a hot water heat pump, which would cost an additional 3k. Does that even make sense?
- Dimplex HPL 9 S-TUW with Hydrotower (300/100 l) 7.0 kW HE heat pump
--> alternatively the HPL12 S-TUW, because we are "on the borderline with the demand," 1k extra cost
My questions would be:
- does the sizing make sense
- does the domestic hot water sizing make sense?
- how expensive should the offers be on average in the market?
- what could still be optimized, or which air-to-water heat pump would be the better solution? Regarding the annual performance factor, the smaller Dimplex seems really good
Cheers & thanks!
I need an analysis of the offer from our heating installer. I’m not quite sure that the configuration makes 100% sense.
Key data:
- 211 sqm living area (2 semi-detached houses, one larger with utility room, one smaller as a rented part, no basement)
- completely underfloor heating, 35°C flow temperature
- standard outdoor temperature -14°C, bivalence point -15°C, annual full load hours 1859
- heat demand (based on specific heat demand): 4.8 kW (specific heat demand 21.82 W/m2)
- annual energy demand: 8920 kWh
- water preparation for 7 people (max! currently 4, foreseeable 6), 30l per person
- no rain shower, normal bathtubs (which are hardly used)
Two different air-to-water heat pumps are offered. (For info: drilling is not possible/economical --> water protection area, trench collector also not possible).
- Hautec HWL-AS-52-AL (9.9 kW), combined storage tank 300/80 l
--> optionally with a hot water heat pump, which would cost an additional 3k. Does that even make sense?
- Dimplex HPL 9 S-TUW with Hydrotower (300/100 l) 7.0 kW HE heat pump
--> alternatively the HPL12 S-TUW, because we are "on the borderline with the demand," 1k extra cost
My questions would be:
- does the sizing make sense
- does the domestic hot water sizing make sense?
- how expensive should the offers be on average in the market?
- what could still be optimized, or which air-to-water heat pump would be the better solution? Regarding the annual performance factor, the smaller Dimplex seems really good
Cheers & thanks!