ᐅ Compliance with the 2016 Energy Saving Ordinance using the following heating system
Created on: 7 Jan 2016 09:40
D
D.Gerner
Hello everyone,
I also need to start dealing with the heating system soon. I keep reading in the forum that it’s becoming difficult for gas boilers to comply with the new Energy Saving Ordinance 2016.
I have come up with the following concept and would like to hear your opinion on it.
General information about the house:
170 m² (1830 ft²) over 2 full floors + hip roof
Exterior wall: 36.5 cm (14.4 inches) Ytong PP-2 0.35 with thermal conductivity λ=0.08, U-value = 0.21 W/(m²K)
No additional insulation
Insulated ground slab
Heating: (Estimated costs)
Gas connection = 2500 €
Gas boiler 20 kW = 3000 €
Mechanical ventilation with heat recovery = 8500 €
Solar thermal system 5 m² (54 ft²) = 6000 € (Possible/useful on a 22° hip roof?)
Underfloor heating = 4000 €
__________
Total cost: 24,000 € (Realistic price?)
Would this setup make sense in your opinion, or have I made a fundamental mistake?
Regards
D.Gerner
I also need to start dealing with the heating system soon. I keep reading in the forum that it’s becoming difficult for gas boilers to comply with the new Energy Saving Ordinance 2016.
I have come up with the following concept and would like to hear your opinion on it.
General information about the house:
170 m² (1830 ft²) over 2 full floors + hip roof
Exterior wall: 36.5 cm (14.4 inches) Ytong PP-2 0.35 with thermal conductivity λ=0.08, U-value = 0.21 W/(m²K)
No additional insulation
Insulated ground slab
Heating: (Estimated costs)
Gas connection = 2500 €
Gas boiler 20 kW = 3000 €
Mechanical ventilation with heat recovery = 8500 €
Solar thermal system 5 m² (54 ft²) = 6000 € (Possible/useful on a 22° hip roof?)
Underfloor heating = 4000 €
__________
Total cost: 24,000 € (Realistic price?)
Would this setup make sense in your opinion, or have I made a fundamental mistake?
Regards
D.Gerner
20 kW?! What do you want to heat – or is this one of those moments where I’m misunderstanding something? For our 190 m² (2,045 sq ft) house, the calculated heating demand was 6.3 kW. You do have a mechanical ventilation system with heat recovery, right?
I believe the boiler including installation will probably be more expensive.
Is the mechanical ventilation system decentralized or centralized? For a centralized system, I would also expect higher costs.
Which windows, roof insulation, floor insulation, and building shape are involved?
There was an example calculation done with solar thermal (ST): 10% solar share for heating and 64% for hot water. I’m not entirely sure if these are fixed estimates – but you can try to get closer using U-Wert.net, which offers a heat demand calculator.
Ultimately (without studying the energy saving regulations in depth), this can only really be clarified using software – at least that’s my understanding.
I believe the boiler including installation will probably be more expensive.
Is the mechanical ventilation system decentralized or centralized? For a centralized system, I would also expect higher costs.
Which windows, roof insulation, floor insulation, and building shape are involved?
There was an example calculation done with solar thermal (ST): 10% solar share for heating and 64% for hot water. I’m not entirely sure if these are fixed estimates – but you can try to get closer using U-Wert.net, which offers a heat demand calculator.
Ultimately (without studying the energy saving regulations in depth), this can only really be clarified using software – at least that’s my understanding.
N
nordanney7 Jan 2016 10:22Why Gas?
The 20KW output was shown to me by deine-gastherme. That seems a bit high.
A central ventilation system is planned.
The windows have a U-value of 0.9.
There seems to be a general discussion about gas plus solar versus heat pump. I decided on gas since, as I read in the forum, heat pumps have higher initial investment costs. Also, future electricity prices are unpredictable (except that they tend to rise). Gas prices have remained relatively stable over the years.
I haven’t yet looked into insulation for the foundation slab and roof. That will probably be my next step.
Thanks for the tip about u-wert.net. I’ll have to watch a crash course on YouTube.
A central ventilation system is planned.
The windows have a U-value of 0.9.
There seems to be a general discussion about gas plus solar versus heat pump. I decided on gas since, as I read in the forum, heat pumps have higher initial investment costs. Also, future electricity prices are unpredictable (except that they tend to rise). Gas prices have remained relatively stable over the years.
I haven’t yet looked into insulation for the foundation slab and roof. That will probably be my next step.
Thanks for the tip about u-wert.net. I’ll have to watch a crash course on YouTube.
You will probably end up working with some kind of planner anyway, right? Self-study only gets you so far – without the right tools, you can only estimate.
As I said... a gas condensing boiler for around 3,000 euros (about 3,000 USD) is rather unrealistic – an air-to-water heat pump is not that much more expensive than solar thermal plus a gas condensing boiler and connection.
Have a look at Heizungsvergleich.de; many systems are calculated there as examples (the prices are, of course, only estimates and will differ in real cases – some points can certainly be questioned).
As I said... a gas condensing boiler for around 3,000 euros (about 3,000 USD) is rather unrealistic – an air-to-water heat pump is not that much more expensive than solar thermal plus a gas condensing boiler and connection.
Have a look at Heizungsvergleich.de; many systems are calculated there as examples (the prices are, of course, only estimates and will differ in real cases – some points can certainly be questioned).
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