Build a gas heater today?

I am someone who no longer finds a gas heating system in new buildings up to date.

Let the heat pump and photovoltaic system be offered separately.
As already mentioned, photovoltaic should rather be larger and the storage only if you get a lot of it paid through good subsidies, otherwise it does not make sense yet.

Gas will become significantly more expensive (electricity maybe too) but with a photovoltaic system that is large enough, I can generate part of the electricity myself.

And of course insulate the house well, better than required, that will definitely pay off over the next 30 years and beyond. Especially now with the high [KFW-Förderung].

Gas will become significantly more expensive (electricity maybe too)

Why?

And of course insulate the house well, better than required, that will definitely pay off in the next 30 years and beyond

How do you calculate the break-even of the insulation measures? Do the costs for the grey energy of the insulation material also factor in here? The aforementioned period exceeds the service life of most heat pumps and gas heaters, and partly already exceeds the lifespan of solar cells, both crystalline and amorphous. Is the reinvestment considered? If you think of insulation as ETICS, are the costs for renovation cycles (depending on the manufacturer every 10 - 15 years) taken into account?

How large do you want to make the photovoltaic system to generate enough electricity for a heat pump in autumn/winter/spring?

The 5 KW planned here for photovoltaic is certainly not enough for that.

I do not dare to tell someone else that gas/electricity will become significantly more expensive or cheaper and that they then make a decision between gas and electricity.

Why?

Because it decreases, because higher taxes apply, etc.

How do you calculate the break-even point of the insulation measures?

It's actually quite simple. A house with insulation X requires a heat amount X and a house with insulation Y requires a heat amount Y. Now you can look at when the better insulated house with the more expensive insulation but less heat demand is financially better off. Of course, there are some uncertainty factors because no one can foresee the exact prices of the future. But in the end, it pays off. We are talking about a new building here; a few centimeters more insulation won’t make much difference. It’s different with renovations. There it might only be worthwhile if you have to do the facade anyway.

The above-mentioned period exceeds the service life of most heat pumps and gas boilers, and in some cases, it already exceeds the lifespan of solar cells, both crystalline and amorphous.

So what? When the service life of the heat generator is over, do you rebuild your house then? Sorry, I don’t understand that argument. And the PV system isn’t only for the heat pump. It also saves electricity costs otherwise and, according to the current legal regulations, even brings in a few euros.

If you’re thinking of insulation as ETICS, are the costs for renovation cycles (depending on manufacturer every 10-15 years) considered?

What needs to be done to ETICS after 10-15 years? You don’t even necessarily have to paint it. And that would have to happen with any other facade as well. Besides, it doesn’t necessarily have to be ETICS. It could also be a ventilated facade or simply thicker bricks etc. You just have to look at what makes ecological sense.

Are the costs for the grey energy of the insulation material also included here?

Here, too, you should of course choose the most ecological insulation material possible.

I know, this is a matter of belief. I think it’s worth it! Especially with the current subsidies! By the way, companies know the subsidies very well. I suspect the surcharge from a KFW70 to KFW55 to KFW40 house wouldn’t be that high if there were no subsidies. Of course, they take advantage of that.

It’s actually quite simple. House with insulation X requires a heat amount X and house with insulation Y requires a heat amount Y.

I did it like that with my new building 5 years ago. The surcharge from back then Kfw 70 to KFW 55 was €15,000, with a calculated annual energy cost saving of ~€100. You can calculate the payback period yourself now. I have naturally left out the repayment subsidy and interest advantages from back then, but your thesis was that insulation pays off after 30 years. And that simply is not the case, when you balance additional costs and possible savings, back then and currently (excluding repayment subsidy and interest advantage).

Because there is less,

Less supply or less occurrence? If in about 10 years no more fossil heating systems are installed, then from that point on something will certainly change on the demand side. In the medium to short term, the commissioning of NordStreamII will have a significant impact on the supply situation. Around the nuclear power plants that will soon be shut down, there are currently numerous combined cycle power plants in the approval phase. They will also influence demand. The Russian doesn’t yet give me the impression that he wants to restrict gas supply in the medium term; we are not yet addicted enough to it.

I am of the opinion that a heating system must fit the house and ultimately should not cost more than necessary. The fact is, however, that a gas heating system is still up to date nowadays and also significantly cheaper to install. Over a period of 30 years, it makes no difference which heating system you install. In the end, the numbers come out the same, only the gas heating system could last the 30 years, whereas this is basically excluded for the heat pump.

Here is a small graphic showing the current situation:

Because it decreases,

Phew...the supply before Corona and even before Nordstream II already far exceeded demand and that will remain the case for a while.

The gas price has been stable for a long time and is now slightly on the rise but still at the same level as 10 years ago, and as soon as Nordstream II is completed, at least no price increases are expected; someone has to take the gas. The storage facilities are full.



Cruise ship giants are being converted to CNG or new builds are being equipped with gas turbines. Experts also see neither a shortage nor rising prices here, and for decades to come.

Pessimists once created this infographic. This has not happened and costs have remained largely the same.


By contrast, the electricity price is steadily increasing.