Hello dear readers,
We are currently making concrete plans for our new build next year. Key details: single-family house, about 130sqm (1400 sq ft), with a basement.
Bien-Zenker has made it to our shortlist. The price-performance ratio seems reasonable, we like the floor plan, and it is also a well-established large home builder.
For heating, we were offered a brine-to-water heat pump with underfloor heating (which we wanted) and a controlled mechanical ventilation system with heat recovery.
Our budget is limited, and we would go for the so-called Efficiency House 55 thermal wall with a U-value of 0.142 W/(sqm·K).
Overall, the house would meet the Efficiency House 70 standard.
I’m no expert, but compared to other manufacturers, this value is average. The "standard wall" from Kampa, for example, would be better.
What do you think about this building services offer overall?
Is the heat pump cost-effective over the years compared to the standard gas condensing boiler?
Many thanks from a beginner for your support and answers.
We are currently making concrete plans for our new build next year. Key details: single-family house, about 130sqm (1400 sq ft), with a basement.
Bien-Zenker has made it to our shortlist. The price-performance ratio seems reasonable, we like the floor plan, and it is also a well-established large home builder.
For heating, we were offered a brine-to-water heat pump with underfloor heating (which we wanted) and a controlled mechanical ventilation system with heat recovery.
Our budget is limited, and we would go for the so-called Efficiency House 55 thermal wall with a U-value of 0.142 W/(sqm·K).
Overall, the house would meet the Efficiency House 70 standard.
I’m no expert, but compared to other manufacturers, this value is average. The "standard wall" from Kampa, for example, would be better.
What do you think about this building services offer overall?
Is the heat pump cost-effective over the years compared to the standard gas condensing boiler?
Many thanks from a beginner for your support and answers.
Cascada schrieb:
...Would you also lean towards the solution with the brine heat pump or still stick with a gas condensing boiler system (including underfloor heating and controlled ventilation/heat recovery)? The answer should be based exclusively on the results of the calculations! Only then can it be reliably assessed which solution is actually appropriate and sensible. Ideally, this should be carried out by an independent MEP planner.
Cascada schrieb:
...I keep thinking about those 60 degrees. There is an appropriate legionella prevention concept for this. Cascada schrieb:
...The consultant suggested planning underfloor heating for the designated basement rooms from the start. This is a sales advisor! 😉 If the basement is part of the heated living area, this must be properly considered in the calculations, including compliance with the energy saving regulations.
Cascada schrieb:
...So, should a corresponding calculation according to the energy saving regulation be part of the specification of services or the purchase contract? The proof of compliance with the energy saving regulation is not necessarily required, as the general contractor/subcontractor will not receive a building permit without it. However, it is worth taking a close look to ensure that the figures have not been “beautified.” While “beautifying” calculations might help with various subsidy applications, it often results in significantly higher operating costs for the homeowner later on. Then advice can be expensive. It is very sensible to include advertising claims in the contract (e.g. KfW 70, 55, 1-liter house, or similar), as the respective requirements are frequently violated (building regulations). Together with the specialist contractor’s declaration, the homeowner then has good chances of free remedial work later, which would otherwise hardly be possible! 😉
It is also advisable to agree on the technical parameters from the system design in the contract. For example, this sets contractual conditions for a good annual performance factor in heat pumps used as heat generators.
Best regards
@ €uro
Thank you very much for your detailed input. It was a great help to me. I will have the final offer along with the construction specification reviewed by an architect and/or an energy consultant.
In my opinion, this makes sense. Better to spend a few extra euros now that might pay off many times over later.
Do you have any specific information on what this might cost? I just hope we’re not talking about several thousand euros + here...
Regards...
Thank you very much for your detailed input. It was a great help to me. I will have the final offer along with the construction specification reviewed by an architect and/or an energy consultant.
In my opinion, this makes sense. Better to spend a few extra euros now that might pay off many times over later.
Do you have any specific information on what this might cost? I just hope we’re not talking about several thousand euros + here...
Regards...
Cascada schrieb:
...I will have the final offer including the construction service description reviewed by an architect and/or an energy expert. Architects and general energy consultants might be somewhat overwhelmed by building services engineering. It makes sense, for example, to hire an energy consultant who is also a building services engineer.Cascada schrieb:
...In my opinion, this would be sensible. Better to invest a few extra dollars that might pay off many times over later. Unfortunately, many homeowners realize this too late! When I inspect systems in practice, I often hear: "Oh, if only we had known that."Cascada schrieb:
...Do you have any specific information on what this might cost? I hope we’re not talking about a few thousand €uro + here... For me, it costs about less than 1,000 euros for a "typical" single-family house, of course depending on the scope of services and building specifications. Geometrically complex buildings tend to be a bit more expensive, while simple ones are cheaper.Best regards.
OK, we will seriously consider this.
We have now also been offered another alternative:
Gas boiler, underfloor heating, and ventilation/heat recovery.
If you exclude the ventilation, this option is about €14,000 cheaper than the ground-source heat pump.
In general, the key data is known. In my opinion, the ventilation should be included for ecological and comfort reasons (no mold, no incorrect ventilation during the heating season, etc.), even though the electricity bill will of course be somewhat higher. According to the seller, about €300.
Would the gas boiler instead of the ground-source heat pump be an adequate option?
Best regards...
We have now also been offered another alternative:
Gas boiler, underfloor heating, and ventilation/heat recovery.
If you exclude the ventilation, this option is about €14,000 cheaper than the ground-source heat pump.
In general, the key data is known. In my opinion, the ventilation should be included for ecological and comfort reasons (no mold, no incorrect ventilation during the heating season, etc.), even though the electricity bill will of course be somewhat higher. According to the seller, about €300.
Would the gas boiler instead of the ground-source heat pump be an adequate option?
Best regards...
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