Underfloor heating is not getting warm - 20,000 kWh consumption

Water loss can come from the broken membrane expansion vessel. Water expands when heated. If the vessel is broken, it will simply be blown off. That way, water is missing in the system.

Sounds logical. I didn't know the exact spot, but something like that has to happen somewhere if water is missing every 5-6 weeks.

Obviously, the factory service seems to focus only on the system itself. Very unfortunate

Have plumbing service called,

I would focus on the question of why so little flow is being shown. Either the pump is delivering too little or the adjustment valves for the hydraulic balancing in the distribution box are throttled too much.

Hi,

maybe I overlooked it, but the first question is:

what supply temperature is being used? The tiles feeling cold is actually okay at low supply temperatures. With the current outdoor temperatures, we run just above 30 °C here, and the floors are not really warm, at most "not cold."

Secondly:

constantly having to refill water is definitely not okay, in my opinion you might need to refill once in the first year because there was still an air bubble from filling.

But after that, it should only be the case every few years at most. Even annually is definitely too much!

Thirdly:

you should follow through with the tip about the heating circuits, that sounds like a poorly adjusted heating system.

But:

20000 kWh sounds like a lot at first, but for a bungalow from 2005 with 130 sqm and a correspondingly unfavorable ratio of room volume to wall surfaces, it's not that absurd. If they shower/bathe a lot, heat somewhat excessively and possibly live in a cold area, that can add up.

We used about 10000 kWh in a semi-detached house with 130 sqm from 2011, with certainly better insulation and a much better room-to-wall ratio. But we are also "light heaters," in the living room we had 21 and in the bedrooms only 18-19 degrees.

I think nothing below 15000 kWh will be possible with that house.

Best regards,

Andreas

A feedback would be good.
And a reduction of 5000kwh is at least 25%