House construction 2016 + gas heating

Unfortunately, I have the normal ones – they might be stable, but almost never anything comes through. The vacuum tube, however, works even under cloudy skies and at lower temperatures. There are also ones that are stable (e.g. Buderus). They also withstand hail. Of course, you can break anything... but I have those things (photovoltaic system, thermal solar) insured with me anyway...

One of the providers we still have in the selection just replaced ST with a ventilation system as standard this year. Together with a gas condensing boiler. That was apparently easier.

solar is a great thing in summer and saves gas. in the end, the solar system costs as much as the additional gas consumption over 20 years. but the ventilation system has a real tangible advantage. you can somehow always conjure up KFW 55/70 with the technology you want. in the end, it’s just a numbers game.

in the end the solar system costs as much as the additional gas consumption over 20 years

If that were the case, I would be glad.

But it is not so.

Depending on how much one deceives oneself, it is 35-50 years......doesn’t matter anyway. Because by the time it *could* have paid off, it will already have broken down twice, been written off, ...... the first time it breaks - I dismantle the nonsense / shut it down and install 3 photovoltaic cells in its place.

ST WW production in these latitudes is complete nonsense and money thrown away. With conventional collectors it’s even such nonsense that you don’t know where to bang your head. Until the thing works - the sun has to shine so strongly - then I don’t even need to bathe or shower hot. Autumn, winter, spring it only takes up space on the roof or protects the roof tiles underneath from rain.

Therefore I recommend vacuum collectors - if you want/need to do it at all. At least they work even when the sky is cloudy.

I only have this nonsense because it was required. It simply doesn’t bring anything at all - just costs money and is a nice little toy. The cost-saving contribution this thing delivers is just laughable, already negative due to capital costs alone. Every wind turbine. Every photovoltaic system, everything is better than this technology, which works great in Italy, Spain, Turkey, the Canaries and Balearics and the Caribbean. Here it simply DOES NOT work.

I have also heard from someone who invested over 20,000 euros in such a system for a single-family house with a granny flat, and the technology simply brought him joy. Maybe it just has to be fun.

PS: For 3 weeks now, the device has delivered 0.0 of usable energy. Occasionally it heated the hot water with supposed 1.1 to 3.3 kWh. Of course, in the lower part of the stratified storage tank. Almost useless - except that the tank cools down a bit slower. With losses of somewhere around 2.5-2.9 kWh / day, almost completely irrelevant.

Such a thing works in sunshine, without a single cloud. We might have about 20 such days here per year.....

So - first defect: off the roof with that crap. Space for 3 more photovoltaic modules. More useful, they even work in rain.... As long as it’s bright.

Maybe it just has to be fun.

But it isn’t – as I said, it doesn’t contribute anything meaningful at all. Except cost money.

You can build things (including photovoltaic systems) that might 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..........absolutely crap.

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

Honestly: I had to install it.

But when I see what the device delivers, 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” as I am. They even have it facing pure south, I have east. But you must not think it works significantly better then......