GAS / SOLAR or GAS / Ventilation + Heat Recovery

Strange, it should actually be possible. We achieve KFW70 with gas and controlled residential ventilation + heat recovery. We did without solar, but had to improve the insulation instead.

It is also possible with additional insulation. I estimate about 20cm more thickness. But in the attic, we also wanted to be able to stand.

It is also possible with additional insulation. I estimate about 20cm more thickness.

Well, if you are not insulating with metal or glass, it is rather a few centimeters.

But in the attic, we also wanted to be able to stand

Is it that tight for you?!? And why?

Is it that tight for you?!? And why?

Kniestock of 130cm (shell dimension), roof pitch of 26 degrees... but it doesn't matter now, we can live with solar (for us, only gas was an option!)

It is also possible with additional insulation. I estimate about 20 cm more thickness. But in the attic we also wanted to be able to stand

Hello ypg,

for me it was 4 cm more roof insulation (previously 20 - now 24 cm).
Nothing changed on the walls - only on the roof.
And I would always do the exchange - solar thermal system against 4 cm insulation - again.
So: having it checked and calculated is worth it!

Regards
Micha

Strange, it should actually be possible. We achieve KFW70 with gas and controlled residential ventilation + heat recovery. We gave up on solar, but the insulation had to be improved for that.

@Brian73
Regarding the ventilation. We were also offered the Lunos units. They are certainly not bad, but you should consider whether you want to go for a centralized controlled residential ventilation system. You should find plenty of discussions about the pros and cons...

That's exactly how I would also like to build and/or heat; gas condensing boiler without solar but controlled residential ventilation with heat recovery. What insulation level do I need to approximately achieve for compensation? For us, it should be a timber frame house, which has a standard U-value of the outer walls of 0.13. Triple glazing of course with a U-value under 0.9. The building is square, south-facing slope location. Does anyone have an experience value if this has (of course must be calculated) a chance of implementation? P.S.: Does the enter key / line break not work for you either?

So walls are worse in our case. I think it was 0.15. The roof has 24 cm insulation between the rafters and 4 cm below the rafters. How much was under the floor slab I unfortunately don't have in mind at the moment. Windows are triple glazing with 0.6 glass and overall with white frames, I also don't know right now. But they were 90 profiles with 6 chambers. How the ventilation system was factored in I can't say right now either, but it is a Wolf cwl 300. I don't know if the Wolf is cheap. Single-family house with a kind of front gable in solid construction