Gas heating new building - Is solar thermal necessary for hot water?

  • Erstellt am 2017-05-22 22:55:44

Nordlys

2017-05-24 09:54:15
  • #1


Someone is planning the house after all. An architect. Or a construction company. They do know that they have to submit the energy calculation with the building application. They also know, roughly: If the house is like this and that, the heating must be like this and that, otherwise it won't work out.
It was like this here: When our house floor plan was final, the head of the general contractor said: This house needs this heating system for the energy saving ordinance, for KFW 55 it would have to be like this and that. Choose, Mr. Builder. (No one even asked the heating engineer)
Karsten
 

chaqrou

2017-05-25 13:57:51
  • #2


We have received an offer and design drawings from our general contractor. In the first offer, he described the heating system and central ventilation system only as such without mentioning details. In the second offer, at least on my insistence, he added the central controlled residential ventilation with heat recovery (Helios). When I asked why the heating system was not specified in more detail, he said that the calculation and design are only done with the building application. We are planning a solid single-family house according to the Energy Saving Ordinance.

Overall, we are satisfied with him even though he is not the cheapest (+ approx. €130/m² with the same floor plan and comparable construction service description).

Is such an approach normal? At least I would like to know what is planned before signing.
 

Nordlys

2017-05-25 21:17:21
  • #3
I think he knows more than he admits and wants to keep his options open. Whether Buderus, Junkers, or Brötje? Whether Brötje or whoever. But whether gas or pump, he definitely has to specify that in advance. Whether underfloor or radiators, that too.
 

chaqrou

2017-05-25 21:28:10
  • #4
I think he wants to leave himself some "leeway". I specified gas condensing boiler, underfloor heating throughout the entire house. As the manufacturer of the gas system, I favor Viessmann or Junkers. Nevertheless, the performance and equipment of the system are not described in the offer, nor is the size of the hot water tank.
 

Nordlys

2017-05-25 21:58:58
  • #5
But that was only determined by the energy calculator for us. How many sqm of solar, how much water storage, what heating output. Only solar, gas condensing boiler, Junkers, underfloor heating were fixed. Karsten
 

chaqrou

2017-05-25 22:14:25
  • #6
When was this decided by you? It sounds like it happened after signing the [Werkvertrag]. It could be that the [GU] calculated at the lowest limit. I cannot estimate how high the surcharges will be later for, for example, better gas systems/equipment or a larger hot water tank and, for example, in stainless steel. From my point of view, [Solarthermie] is not planned.
 

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