House construction 2016 + gas heating

But it doesn’t - as I said, it doesn’t contribute anything useful at all. Except cost money.

You can build things (also a photovoltaic system) that maybe cost more than they bring, but they still bring something.

This ST zero-negative-slider thing is slowly driving me crazy in my place here..........underground s****.

Half of my utility room is full of a hot water storage tank the size of half a swimming pool. It was expensive. Takes up space. High losses due to size (maintenance energy). The whole installation. The costs.

Honestly: I had to install it.

But when I see what the device brings, it’s the biggest bad investment I have ever made/had to make.

I also know other builders who have such nonsense on their roofs......all just as enthusiastic in "" as I am. They even have it facing pure south, I have it east. But one must not believe it works significantly better that way......

Well, at least in the height of summer at 40 degrees you can enjoy a free warm shower in the evening.

Why didn’t you consider Controlled residential ventilation, special electricity tariffs, more insulation, or photovoltaics? We also have an east/west gable roof -> but I never wanted to put a solar thermal system on the roof. I reserved the option for better insulation for emergencies.

I have controlled residential ventilation with heat recovery. Works great - very satisfied, very useful.

The insulation is also very good. The house (KFW-70 certified) is very close to KFW-55, 40 euros gas/month on average annually including hot water.

Next step insulation additional floor slab and more: 15-20K +, was too expensive for me to save another 5 euros per month.

I don’t need special electricity tariffs because I don’t operate a heat pump. My neighbor next door has one... and is so proud of his low costs of only 70/month for electricity that goes into the COP 2.7 box. The house is the same size in square meters... completely comparable.

I usually shower warm even in summer (then lukewarm). But then with good weather the huge amounts of hot water available just don’t get used. After about 5-6 days of Azores high pressure (so here in Velbert once in 5 years, lol) the storage tank is 74 degrees - saves me at least a thermal disinfection then. Luckily I installed a mixing valve so that we don’t burn ourselves with the then too hot water... so... I stick to it: solar thermal is pure nonsense here in this country.

Photovoltaics were retrofitted since 07.04.16... also very satisfied. Much better than solar thermal.

Best regards Thorsten

And who forced you to install solar thermal? Sounds basically very realistic for the Energy Saving Ordinance 2009... even without ST