ᐅ New single-family house construction with a gas heating system, but without solar panels

Created on: 29 Jun 2015 17:49

Hello everyone,

I have already searched on Google, but I couldn’t find a suitable answer for our specific project.

In short: We want to build a single-family house. It will have a gas heating system, but I want to avoid solar panels, heat pumps, or other alternatives (please don’t question the reasoning behind this).

Here are some key details:
- Single-family house, about 153m² (1646 sq ft) of living space on 2 full floors plus a full basement
- 365 mm (14.4 inch) exterior wall, T10 bricks, possibly T9 bricks
- No KfW funding!
- decentralized ventilation system with heat recovery
- wood stove on the ground floor

Of course, I know that the Energy Act (EEnG) requires a certain percentage of energy consumption to come from renewable sources.

My question is: Under the above conditions, is it sufficient to simply choose an eco-friendly gas tariff from the energy supplier, allowing me to avoid installing solar panels, additional insulation, heat pumps, or similar measures? Or is it mandatory to install solar panels on the roof?

ypg29 Jun 2015 22:50

#13

merlin83 schrieb:
I have not yet seen a calculation where solar thermal proved to be cost-effective.

I thought the topic was about bypassing the energy saving ordinance / regulations?

Hirsl29 Jun 2015 22:56

#14

This is often the case with our lawmakers: the additional costs are always passed on to the end customer. And when it comes to building a house, expenses can quickly add up.

I guess I have to accept it: 36cm (14 inch) T9 bricks, triple glazing, underfloor heating everywhere, a wood stove, and a modern gas condensing boiler are not enough – solar panels or a heat pump are also required… of course, without any subsidies. If I wanted those as well, I would have to invest even more (external insulation, roof insulation, etc.).

What other cost-effective options are there?

ypg29 Jun 2015 22:59

#15

There it is: Solar is an option that raises doubts about its payback period, but at least it is the most cost-effective choice. It is no coincidence that the building units have gas with solar as the standard in the (lock) program.

Bieber081529 Jun 2015 23:30

#16

ypg schrieb:
Is the topic about bypassing the energy saving regulations?

I’m interested as well! However, only academically, since we’re investing a lot of money in an air-to-water heat pump ...

Hirsl30 Jun 2015 06:31

#17

Bieber0815 schrieb:
I would be interested as well! However, only academically, since we are spending the money on an air-to-water heat pump...

Then that is also fine.

Basti270930 Jun 2015 09:43

#18

Hirsl schrieb:
This is often the case with our lawmakers: the extra costs are always paid by the end customer. And everything around the house gets really expensive.
I guess I have to accept it: 36 cm (14 inches) T9 bricks, triple glazing, underfloor heating everywhere, wood stove, and a modern gas condensing boiler are not enough – there has to be solar panels or a heat pump as well... of course, without subsidies. If I also wanted those, I’d have to invest much more (external insulation, roof insulation, etc.).

What cost-effective options are still available?

We are currently building:

- Single-family house, approx. 130 m² (1400 sq ft) living space over 1.5 floors / without basement
- 17.5 cm (7 inches) exterior wall made of sand-lime brick + 14 cm (6 inches) external thermal insulation composite system (ETICS)
- no KFW!
- no decentralized ventilation system with heat recovery
- no wood stove on the ground floor

and we also decided against solar panels because they are not cost-effective... especially since our roof can only be oriented east/west... so we have received our building permit / energy certificate.

ᐅ New single-family house construction with a gas heating system, but without solar panels

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