We are currently building a single-family house (Pinneberg, construction company Kage, 119 sqm (1280 sq ft), 40-degree gable roof, no basement) and I am considering a ground source heat pump. The building consultant advised against it because it is too expensive: 13,000 euros more than a conventional gas heating system.
At the moment, we live in a rented semi-detached house (3 people, built in 2008, 130 sqm (1400 sq ft), gas heating) and our gas consumption costs about 60 euros/month = 720 euros/year.
If the heating cost with a ground source heat pump is only half as much (according to the advisor’s rough estimate), then you calculate 13,000 / (0.5 * 720) = 36 years performance factor!!!
Is that correct?
What do you think about the economic efficiency of a ground source heat pump?
PS
Sorry, German is not my best language, please be patient... :-{
At the moment, we live in a rented semi-detached house (3 people, built in 2008, 130 sqm (1400 sq ft), gas heating) and our gas consumption costs about 60 euros/month = 720 euros/year.
If the heating cost with a ground source heat pump is only half as much (according to the advisor’s rough estimate), then you calculate 13,000 / (0.5 * 720) = 36 years performance factor!!!
Is that correct?
What do you think about the economic efficiency of a ground source heat pump?
PS
Sorry, German is not my best language, please be patient... :-{
N
nordanney9 Jul 2018 21:34I can only share from our new build about four years ago – back then it was Kfw 70 standard.
We heated 300 sqm (around 3,230 sq ft) for just under 400€ per year. Comfortable temperature was just below 22°C (72°F). We had a mechanical ventilation system with heat recovery installed. I can’t say how much gas it would have cost. But when we sold the house two years ago, the low energy costs definitely paid off...
We heated 300 sqm (around 3,230 sq ft) for just under 400€ per year. Comfortable temperature was just below 22°C (72°F). We had a mechanical ventilation system with heat recovery installed. I can’t say how much gas it would have cost. But when we sold the house two years ago, the low energy costs definitely paid off...
OK, thanks.
But 300 m² (3,229 ft²) and 119 m² (1,281 ft²) are quite different. Of course, a 300 m² (3,229 ft²) house requires a larger heating system, whether gas or heat pump, but I don’t expect it to be much more expensive. However, the operating costs for 300 m² (3,229 ft²) are much higher than for 119 m² (1,281 ft²).
The larger the house, the more cost-effective the heat pump becomes.
But 300 m² (3,229 ft²) and 119 m² (1,281 ft²) are quite different. Of course, a 300 m² (3,229 ft²) house requires a larger heating system, whether gas or heat pump, but I don’t expect it to be much more expensive. However, the operating costs for 300 m² (3,229 ft²) are much higher than for 119 m² (1,281 ft²).
The larger the house, the more cost-effective the heat pump becomes.
Let’s say, just theoretically, the heat pump uses NO gas or electricity.
Then 13,000 EUR / 720 EUR/year = 18 years.
Of course, we don’t know future gas prices; gas will likely become more expensive, but with a heat pump, we also have to pay higher interest rates for the larger loan.
Not economical.
Then 13,000 EUR / 720 EUR/year = 18 years.
Of course, we don’t know future gas prices; gas will likely become more expensive, but with a heat pump, we also have to pay higher interest rates for the larger loan.
Not economical.
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