ᐅ New Gas Heating System for a New Build – Is Solar Thermal Needed for Domestic Hot Water?

Marchonisch schrieb:
Thank you. Finally getting down to business. But how do you know that? I searched online and couldn’t find anything….

And one of the two heating installers wants to sell me ONLY the thermal insulation including heating. He refers to the energy saving regulation.

If he is referring to the energy saving regulation, ask him where he got that information. He would need to have calculated the energy saving regulation certificate, which he definitely hasn’t done, because that requires knowing all the details about your house. This is nonsense and just a way to make money.

Alternatively, you can commission the creation of an energy saving regulation certificate yourself, so you have clear, written proof of what system components you need to comply with the requirements.

I also suspect it’s a sales pitch. Now, one has to understand that when I look at my energy saving regulation calculation, which I don’t fully comprehend, the building services are only one parameter. The most important factors are the windows—how many and how large? The fewer, the better, it seems to me. Our house, for example, barely meets the energy saving regulation. The solar system doesn’t provide much credit. It’s a kind of give-and-take calculation. Renewable energy adds a lot of points, gas subtracts. The whole thing makes no sense to me and is a reason why I would never support this energy policy. It’s just a subsidy program for heat pump specialists funded by electricity companies. Karsten

Marchonisch schrieb:
...
And one of the two heating installers only wants to sell me the load-bearing walls with heating. He refers to the energy saving ordinance

What is that supposed to mean? What does it mean? What exactly is meant by heating.?


Regards, Yvonne

Heating Support

To implement solar thermal (ST) with heating support, your supply temperature must be designed to be extremely low, and the ST system needs to be very large. Financially, using it for domestic hot water rarely makes sense.
The energy saving regulations focus on primary energy demand. This can be reduced through excellent insulation or, somewhat artificially, through the ST system.
I would recommend insulating the ground slab well since it cannot be accessed later, and increasing the insulation thickness in the roof or top floor ceiling. When done as self-installation, this almost does not increase the cost.
Otherwise, only insulating the walls is an option, but that is usually not desired.

matte1987 schrieb:
Alternatively, you can commission the preparation of an energy-saving ordinance certificate, which allows you to have a clear written record of the requirements needed to comply for system components.

Exactly, and please do this not with the heating contractor mentioned, but with the energy consultant. Anything else is just guesswork...