Hello!
I'll start.
Heated area 200m2 (2,153 sq ft)
KfW 55 standard
Mechanical ventilation with heat recovery
Current outdoor temperature 6°C (43°F)
Heating energy consumption including hot water 35 kWh
Electricity consumption 9 kWh
COP 3.88
I'll start.
Heated area 200m2 (2,153 sq ft)
KfW 55 standard
Mechanical ventilation with heat recovery
Current outdoor temperature 6°C (43°F)
Heating energy consumption including hot water 35 kWh
Electricity consumption 9 kWh
COP 3.88
Which calculation? There are just three numbers there 8-)
If you simplify by assuming that the energy price, considering the annual performance factor, is almost the same, then it’s about a direct comparison of the investment in a gas boiler versus a heat pump. Additional costs (chimney, etc.) are more likely with gas, while subsidies tend to apply to heat pumps. You really have to look at the individual case.
Another option would be gas with conventional radiators (i.e., no underfloor heating). This is probably by far the cheapest variant.
If you simplify by assuming that the energy price, considering the annual performance factor, is almost the same, then it’s about a direct comparison of the investment in a gas boiler versus a heat pump. Additional costs (chimney, etc.) are more likely with gas, while subsidies tend to apply to heat pumps. You really have to look at the individual case.
Another option would be gas with conventional radiators (i.e., no underfloor heating). This is probably by far the cheapest variant.
netuser schrieb:
Am I correct in assuming that the comparable calculation for a smaller area (let's say 120-150 sqm (1,290-1,615 sq ft)) would look different or shift in favor of the heat pump? After all, the fixed costs for gas (meter, chimney sweep/inspector...) would weigh more heavily here, wouldn't they? As my predecessor mentioned, this is not so easy to answer. The heat pump would be cheaper in terms of investment. A gas boiler is not particularly maintenance-intensive, and chimney inspections are not expensive.
However, there would certainly be a slight improvement.
Bookstar schrieb:
Out of curiosity, I did a calculation for my case to see whether a gas system, air-to-water heat pump, or ground-source heat pump would be more economical.
[...]
220 m² (2,370 sq ft) heated area, KfW55 standard (energy consumption 4,500 kWh heat output) Are the 4,500 kWh figures correct? With a seasonal performance factor of 4, that would mean 1,125 kWh at €0.23 per kWh (mine is €0.205), so about €260. Or is it four times that amount?
Here, gas heaters with smaller (but older) radiator heating systems run at around €700 per year, and I, with a newer semi-detached house built to KfW70 standard and an exhaust air heat pump (which was mandatory), pay about €600 per year.
Bookstar schrieb:
We are not talking about photovoltaics here, but about gains through the windows. Alright. I could look up the exact values sometime. It feels like very little heat passes through the triple-glazed window compared to the solar heat outside the glass.
4lpha0ne schrieb:
Is the 4500 kWh correct? With an annual performance factor of 4, that would be 1125 kWh at €0.23 (for me, by the way, €0.205), so €260. Or is it four times that amount?
Here, gas heaters with smaller (but older) radiators cost about €700 per year, and I, with a new semi-detached KfW70 house and an exhaust air heat pump (which was required), pay about €600 per year. Ah, mistake—the 4500 is electricity consumption; the amount of heat is naturally four times higher in reality with an air-to-water heat pump. But that doesn’t change the figures.
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