ᐅ Gas boiler combined with solar panels or would pellets be a better option?

Hello everyone,

We are planning to build a house with a secondary apartment this year. In total, about 235 m² (2,530 sq ft) need to be heated. From the beginning, we decided to heat our house with gas. However, according to our architect, a gas boiler alone is not possible because, according to the Renewable Energy Heat Act, at least 15% of the heating energy demand must be covered by renewable energy sources. Is this correct?

If so, we would consider a combination of gas + solar or gas + pellet stove (hydronic) in the living room.

Which combination would you recommend?

Which gas boiler/gas condensing wall boiler with hot water storage would heating specialists recommend to us?

Thank you very much!

So, can I also meet the 15% requirement with a gas boiler and a wood-burning stove (continuous operation stove)?

I would prefer not to use a heat pump, and with solar alone, I cannot heat 220 m2 (2,370 sq ft).

Hello,

Lexus schrieb:
But according to our architect, a gas boiler alone isn’t possible because, according to the Renewable Energy Heat Act, we must demonstrate that at least 15% of the heating energy demand comes from renewable sources. Is that correct?

No! There are exceptions. I would advise changing the architect.

Lexus schrieb:
...Which gas boiler/gas condensing wall-mounted boiler with a hot water storage tank would the heating specialists recommend?

This question cannot be reliably answered at all. For this, the standard heating load, the room heating loads, and the hydraulic requirements of the heating surfaces must be known.

Best regards

Lexus schrieb:
So, can I also prove the 15% with a gas boiler and a wood-burning stove (continuous operation)?

No. Furthermore, the proof must be provided by a professional with the appropriate qualifications. You should consult a real expert (HVAC planner). Otherwise, the project could become a money pit.

Best regards

Hello Mr. Koch,

NorbertKoch schrieb:
Hello, yes the 15% is correct.

But only if you are not familiar with § 9 EEWG!

NorbertKoch schrieb:
...Why use gas and not just pellets combined with a solar thermal system for hot water and heating support? In my opinion – move away from fossil fuels.

Have you ever actually looked into the real yield of solar thermal systems in single-family homes? Measurements of actual energy output in practice compared with the “optimistic” simulations? Probably not!

Best regards.

I don’t understand this now...?!

Euro??

"
Quote: Quote from Lexus
However, according to our architect, a gas boiler alone is not possible because, according to the Renewable Energy Heat Act, at least 15% of the heat energy demand must be covered by renewable energies. Is that correct?

No! There are exceptions. I would consider changing the architect."

Do I now have to prove the 15% and also have it from the heating system or not?

I originally just wanted a gas boiler, but now I have to additionally integrate either solar or a stove (pellet or wood) into the system.