Gas condensing boiler with solar, which system?

Hello,

we are planning a new build and have decided on a gas condensing boiler technology with solar support for water and heating as well as a water-bearing fireplace.

Now there are different systems and companies for heating with solar, and we would like to know about your experiences: Viessmann, Vaillant, Buderus? I have already been able to find out something about [B]Vaillant.[/B]

Then there is the question: boiler or furnace? Is there a difference? If yes, what kind and what would be better for a detached house of about 150 m2?

Now someone has recommended a gas condensing boiler with a solar system from ROTEX. It is said that the solar panels should only be filled with water and empty themselves into the tank in the basement when the sun does not shine. The whole thing can be refilled with water yourself; otherwise, everything is maintenance-free.

That would save the replacement of the fluid in "normal" solar systems, which allegedly is necessary after a few years. Is that correct?

Does anyone know such a system and can say something about it?

Also, there is the question of what amount of solar panels and what tank size is recommended for a 1150 m2 detached house.

Many thanks in advance for your answers!!!

Maya

Hello,

...we are planning a new building and have decided on a gas condensing boiler technology with solar support for water and heating as well as a water-bearing fireplace.

Why this combination?
Solar thermal systems have rarely proven to be actually economical in single-family homes. Furthermore: I would invest the additional effort for the water-bearing stove elsewhere. Presumably KFW 55 is planned? ;-)
In many cases, it is hardly possible in practice to optimally manage a system. If various other components (heat generators) are added, it usually ends up being a money pit. In the advertising brochure, of course, it looked quite different. ;)

Best regards

Sorry, but I didn’t quite follow that.

What problems can occur with the chimney?

We definitely want a chimney. That’s why we also want to use it for heating right away.

We probably won’t reach Kfw 55 since there is no pellet heating. But that doesn’t matter.