Chimney inside or outside?

And the pumps of the gas condensing boiler consume exactly which electricity ...?

Rhenish regards

Are you now referring to the circulation pump of a gas condensing boiler? It hardly consumes anything.

Are you now talking about the circulation pump of a gas condensing boiler? It hardly uses any power at all.

I'm not concerned about much or little; what bothers me is merely the reported remark by about "dirty" electricity. Even a gas heating system doesn't run without electricity ;) Rhineland greetings

Whereas with the latter, the calculation per gas is often somewhat shortened. Because the burner may be cheaper, but the connection is not for free (one-time fee), the chimney is also not free, and maintenance and the chimney sweep must also be paid continuously.

A regenerative share is mandatory. The primary energy calculation is set up in such a way that it no longer works with gas without a regenerative share. Controlled residential ventilation or ST you mentioned as a possible solution

For us, the conditions for gas were favorable. 595 EUR gross for the house connection including free network expansion in the public area. That is certainly not so cheap everywhere. The boiler is located in the attic, so you only have to go "through the roof," meaning you don’t need a proper chimney.

In terms of the regenerative share, we just barely got around it (submitted documents December 2014). We insulated 15% better, which counted as a substitute measure for solar thermal energy. We could also have listed controlled residential ventilation/heat recovery as a substitute measure, which we also have.

As a hobby, we also have a wood stove with 5-6 kW. We integrated the two-flue chimney for it into the living room in such a way that the wall there is "flush." On the roof, the chimney comes out right next to the ridge. The stove is room-air independent/external combustion air supply/Dibt-certified – so it can be combined with controlled residential ventilation/heat recovery without having to install a pressure differential monitor.

Hi building expert...

And the pumps of the gas condensing boiler consume exactly which electricity ...?

Aha, so a heat pump doesn't have a circulation pump? So the water flows through the underfloor heating by just placing your hand on it, or what?

By the way: these things use between 10 and 50 watts during operation, which really is negligible.

Best regards,

Andreas

Hi,

It’s not about much or little; what bothers me is merely the rumored remark by about "dirty" electricity. Even a gas heating system doesn’t run without electricity

I never claimed the latter either. But the electricity consumption required for flame control is really marginal. Everything else should also be present with a heat pump.

Yes, heat pumps run on dirty electricity in winter, very dirty even. And just because you don’t want to hear it, or because some politicians without any scientific education decide some nonsense, doesn’t change physics.

You cannot change the laws of physics at the green table!

Even if many lobbyists and politicians in Berlin throw themselves on the ground and scream loudly: “I want, I want…” the mouse will not suddenly eat the cat, nor will water flow uphill.

Best regards,

Andreas

The share of renewable energies in the German electricity mix is approximately 35%. Photovoltaics account for 10% and solar thermal energy for 2% of these 35%, respectively 3.5% and 0.7% in the electricity mix. The share of electricity from solar (thermal) energy and thus seasonally dependent sources is therefore very low. What would change so radically in the electricity mix in winter does not become clear to me. To understand this, facts would be preferable; so far, I only see loud ranting.