Construction costs are currently skyrocketing

what says is not entirely wrong, from around April to early October you have more than enough hot water (we with our 300l storage tank). Our solar thermal system was put into operation at the end of 07/2016, as of today the meter shows 37,610 kWh, which would be about 2250€ at around 6ct gas, which we did not have to spend on gas. Has the system paid off? No, I don't think so, because I didn't know the extra cost of the solar thermal system, it was just included. But I think the extra cost was definitely more than this 2250€. Well, this year it will probably have to give way to the 28.xx kWp photovoltaic system because in my opinion I can easily make up the approximately 30€ (or rather 60-100) more that I would then have to pay as a gas advance. Because after about 5.5 - 6 years (if my current electricity costs per kWh remained the same for that long) the photovoltaic system would have paid for itself. But I wouldn't throw away or give up the solar thermal system, because what I have, I have and what I still need, I don't know :cool: These are my experiences with it

Aha. Someone who doesn’t know that screw connections are loaded in tension is explaining solar thermal to me. So I paid just under 1,000 EUR for my 5m² solar thermal panels. That gets me through May to October without a gas burner... good deal, I think. The neighbor paid 15,000 for his 10kWp system and feeds into the grid in summer for 6 cents/kWh. Do you want to calculate the rule of three or should I do it? It’s quite complex, did you ever practice that in secondary school? In the meantime, you can stick some screws into the wall and hang heavy cabinets on them without loading the screws in tension ;)

All your numbers are once again complete nonsense from start to finish and not really worth commenting on. You’re just a troll. Now the cost price for solar thermal panels from the hardware store, which of course has nothing to do with a complete, turnkey system, is being compared to an equivalent photovoltaic system. Heating support, which was the topic before, is of course not achieved with that either. 2000kWh energy savings for hot water in summer is huge nonsense. Oh, and the gas costs 12 cents at your place? Suddenly you’re calculating completely differently... Sorry, your posts are and remain embarrassing, I don’t even know how a proper screw connection works or how one could research that.

I also don't know why we are now talking about the amortization of an obviously price-conscious self-installed 1000€ ST, when the system from costs ten times as much. That is a completely different scale. Sure, for 1000-2000€ (if that figure is correct ...) it can be done once, but with an investment of 10k€ one should reconsider whether to save one’s money first.

What do you actually need a 300 liter hot water tank for.. That is pure energy waste. I have a 500 liter tank for 10 apartments! And that is more than enough. Normally, 120 L in a single-family house is totally sufficient, and less heating is needed accordingly.

Solar thermal energy is just as pointless. With the self-generated solar power, you can easily heat hot water. Without much technical effort. At least it works perfectly for me. From the end of February to the end of October, I have no costs for WW generation.

I believe this is a bit of modern luxury. As children, we were bathed once a week and otherwise used a washcloth, just as the adults did not shower daily. Today, many adults probably shower daily, sometimes even several times, and children bathe much more often. In this case, a large hot water tank is already sensible.

This heat pump+photovoltaic cladding here in the forum is really annoying sometimes.

Do "heat pump+photovoltaic" systems work without feeding electricity back into the utility grid? I read today from the "Hamburg nobility" ;-) that as of 01.01.24, utility providers will be allowed to throttle electricity supply for charging e-cars and heat pumps if their consumption is too high. Then heat pumps would only work with photovoltaics, or does that not help the end consumer in this situation either? (If the question is stupid, I apologize; I have not yet fully grasped the entire topic.)