ölschlamm
2015-12-21 13:49:56
- #1
I don’t know how you come up with minus 10 sqm, in my case a 6 cm difference results in 2.40 sqm/floor (in your example); so just under 5.00 sqm for the entire house
I had stated my assumptions before my calculation: 42cm monolithic vs. 17.5 bricks + 16 cm EPS
It "may" be that the increased insulation is necessary to comply with the Energy Saving Ordinance 2016 if you insist on gas as the heat source.
Man Bauexperte – it’s great that you help people here, but have you also read what I wrote: The insulation IS mandatory with gas and the Energy Saving Ordinance 2016. But how much it saves additionally – that was the question.
If I read your information again, you have already given the answer yourself as to which heating system you should choose.
First of all, thanks a lot for your long answer, but I haven’t given myself the answer. If I calculate with 10000 kWh, burning at least 2 cubic meters of wood in the wood stove (which is well below my long-term average), then I get to 7000 kWh. With an annual performance factor of 2.1 and an electricity price of 0.25 € per kWh, that is 840 euros. I would have estimated the gas costs significantly lower than you did. At the end of the day, I still come to additional costs of 500 euros per year with my calculation. Against that stand additional costs of 9500 euros for gas + solar + insulation + tank + etc.
Do you think an aluminum condensing boiler lasts 20 years?
And 9500 over 20 years with 1.5% interest amounts to over 12500 euros. I can pay a lot more electricity for quite a long time with that.
And two answers: Yes, it is the Energy Saving Ordinance 2016 – the building application will be submitted in spring. Therefore: gas only with additional insulation (wall + roof or floor slab). And I don’t want XPS beneath the floor slab. I also believe that will work well – but a residual risk remains. And my house stands on it.
Is there no alternative to the air-to-water heat pump apart from gas?
No, I want to keep the initial investment low. The house will probably be sold in 10+ years.
Greetings to you all
Michael