Hello, we are currently planning our new build. We are choosing a gas heating system with solar support for domestic hot water. Would you also consider solar support for space heating?
Would you also connect a hydronic fireplace?
Would you also connect a hydronic fireplace?
B
Bauexperte21 Nov 2015 13:57@ Oelschlamm
All discussions I have had so far with professionals regarding the requirements of the 2016 Energy Saving Ordinance indicate that gas and the upcoming energy regulations will no longer be easy to implement. A higher insulation standard must be applied, as well as controlled residential ventilation with heat recovery and additional renewable energy sources; solar energy for domestic water heating alone will likely not be sufficient. This makes the financial effort so high that gas will no longer be cost-effective if building a KFW energy-efficient house.
Best regards, Bauexperte
Bauexperte
All discussions I have had so far with professionals regarding the requirements of the 2016 Energy Saving Ordinance indicate that gas and the upcoming energy regulations will no longer be easy to implement. A higher insulation standard must be applied, as well as controlled residential ventilation with heat recovery and additional renewable energy sources; solar energy for domestic water heating alone will likely not be sufficient. This makes the financial effort so high that gas will no longer be cost-effective if building a KFW energy-efficient house.
Best regards, Bauexperte
Bauexperte
@Bauexperte
...... I know that. It matches my knowledge as well. Nevertheless, two different Town & Country licensees have independently assured me that their houses would be approved under the 2016 Energy Saving Ordinance (24cm (9.5 inches) Ytong blocks, ventilation with heat recovery, and 4m² (43 sqft) solar thermal). Again my question: What advantage would this claim from the general contractor have if it does not reflect the facts? Ok, he might initially attract the client, but won’t the whole thing eventually be exposed?
Bauexperte schrieb:
All the discussions I've had so far with professionals regarding the requirements of the 2016 Energy Saving Ordinance show that implementing gas and the upcoming Energy Saving Ordinance will not be as easy anymore.
...... I know that. It matches my knowledge as well. Nevertheless, two different Town & Country licensees have independently assured me that their houses would be approved under the 2016 Energy Saving Ordinance (24cm (9.5 inches) Ytong blocks, ventilation with heat recovery, and 4m² (43 sqft) solar thermal). Again my question: What advantage would this claim from the general contractor have if it does not reflect the facts? Ok, he might initially attract the client, but won’t the whole thing eventually be exposed?
Both offers are provided in writing, no construction contract yet, but in the form of a 6-page performance specification. There is no mention of enthalpy anywhere, just regular heat exchangers based on the principle of reversible airflows. The entire controlled residential ventilation system costs something under 1000...
I also reviewed this again this afternoon. The new Energy Saving Ordinance 2014 and gas boilers...
You get overwhelmed by studies, etc. But you won’t find anything 100% definitive.
The trend seems to be:
Gas boilers are still allowed under the new Energy Saving Ordinance if you:
- Improve insulation even further
- Use controlled ventilation with heat recovery
- Add solar support for domestic hot water
- Probably also add solar support for heating
(from my point of view, to make these points worthwhile: vacuum flat-tube collectors, which are not cheap, and underfloor heating then becomes almost a must-have)
- Possibly add further renewable energy sources
In other words: everything is possible – but “it will realistically become expensive.”
The upcoming primary energy factor for electricity of 1.8 is simply a deal-breaker in the calculations and makes the use of a heat pump almost the only realistic option if you want to keep costs under control.
Some of these studies are only expected to be published in early 2016. So I have my doubts... I really think that the gas boiler in a KfW-subsidized new single-family home will have a visibly limited lifespan going forward.
Controlled ventilation with heat recovery for under 1000 euros? Honestly – I can’t imagine that. Replacement parts for just the two fan motors of my Pluggit system would be more expensive. I imagine the total cost to be between 6,000 and 10,000 euros (6-10k Euro)...
You get overwhelmed by studies, etc. But you won’t find anything 100% definitive.
The trend seems to be:
Gas boilers are still allowed under the new Energy Saving Ordinance if you:
- Improve insulation even further
- Use controlled ventilation with heat recovery
- Add solar support for domestic hot water
- Probably also add solar support for heating
(from my point of view, to make these points worthwhile: vacuum flat-tube collectors, which are not cheap, and underfloor heating then becomes almost a must-have)
- Possibly add further renewable energy sources
In other words: everything is possible – but “it will realistically become expensive.”
The upcoming primary energy factor for electricity of 1.8 is simply a deal-breaker in the calculations and makes the use of a heat pump almost the only realistic option if you want to keep costs under control.
Some of these studies are only expected to be published in early 2016. So I have my doubts... I really think that the gas boiler in a KfW-subsidized new single-family home will have a visibly limited lifespan going forward.
Controlled ventilation with heat recovery for under 1000 euros? Honestly – I can’t imagine that. Replacement parts for just the two fan motors of my Pluggit system would be more expensive. I imagine the total cost to be between 6,000 and 10,000 euros (6-10k Euro)...
B
Bauexperte22 Nov 2015 09:35Hello,
I know a licensee around here; until recently, he was the managing director of a subsidiary of a British mobile phone company. His knowledge of house building is about the same as most building novices here.
Crystal ball mode on: As long as the details of the offer are included in a legally binding construction contract, the "if/then" clauses will be found in the fine print. Crystal ball mode off.
Regards, Bauexperte
ölschlamm schrieb:
@Bauexperte
Once again my question: What advantages would this claim by the general contractor have if it does not reflect reality? Ok, he initially "hooks" the client, but the whole thing will eventually come to light, right?
I know a licensee around here; until recently, he was the managing director of a subsidiary of a British mobile phone company. His knowledge of house building is about the same as most building novices here.
Crystal ball mode on: As long as the details of the offer are included in a legally binding construction contract, the "if/then" clauses will be found in the fine print. Crystal ball mode off.
Regards, Bauexperte
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