Gas heating new building - Is solar thermal necessary for hot water?

...and all the mechanics I know, and I know two good ones, say that the pump is ultimately a reversed air conditioner. The weak point is the constantly running compressors, which last between five and ten years, then need to be replaced, and that costs significantly more than a thousand euros because at least they can do that themselves. You have to be well versed in mechanical engineering and refrigeration technology. A gas boiler, on the other hand, lasts 15 years with low maintenance effort. The parts inside are cheap mass-produced items. Karsten

Hello,

They can't ban existing ones.

Just ask the drivers of Euro 5 diesel cars, some of which are barely 2 years old, who soon won't be allowed to drive into city centers...

Sure, pretty much anything can be banned if some lobby pushes it through.

No matter how sensible or nonsensical it may be!

I would almost bet that in no more than 10 years gas heating systems for new buildings will no longer be approved. Whether you will still be allowed to replace a broken gas heater with a new one remains to be seen. At the very least, gas heaters will most likely become significantly more expensive; either because fewer are produced or because some environmentalist invents a nice penalty tax for them.

So designing the heating system so that you could connect a heat pump if necessary is certainly not a bad idea.

But that should be the normal state of the art anyway. Our gas heating system runs only at about 28-35 °C flow temperature, only in severe frost does it go up to about 40°C.

Best regards,

Andreas

In any case, the setting should be at a maximum flow temperature of 35 degrees, or even better, and actually this is completely standard with non-budget providers.

I don't believe that existing gas heating systems will be banned anytime soon, and it almost never makes sense to replace something that works. But as Nordlys wrote: such a gas boiler lasts 15 years. So if you build today, then until about 2032. There is already discussion about banning the installation of new gas and oil heating systems from 2030. Then you have a problem in 2032.

Of course, it could also turn out differently.

I really don’t build expensively, but the Junkers with 35 degrees flow temperature and underfloor heating is standard in the construction service description. Additionally, hot water via solar. The gas connection costs 1514,- at the supplier. Air-water heat pump 8 surcharge. KfW didn’t interest me. No desire for that fuss. So step on it. Karsten

Yes, a surcharge of 8 because he earns a lot with it. And in 15 years, when the boiler is broken, you are free to decide. Take a look at various forums. After 8 years, a well-known manufacturer discontinued an important spare part. Now the owners are left stranded.

They can’t forbid what already exists.

Of course they can. It’s just unpopular in this country. No matter how necessary and sensible it would be, because political suicide is to be feared. Unfortunately. That severely hampers this society.

And my life experience tells me: gas price fluctuates, electricity price only knows one direction: upstairs, Karsten

Then you’ve probably been closing your eyes for a while. It obviously depends on the period you want to consider, but for example since the beginning of the millennium, both electricity and gas prices have doubled. Electricity rose more linearly, gas sometimes abruptly. The former due to increased taxes, the latter because of speculation and international politics. So both have risen roughly equally. Gas is just more volatile.

...and all the mechanics I know, and I know two good ones, say that the pump is ultimately just a reversed air conditioner.

yes ...

The weak point is the compressors that run continuously

... and that’s where it stops. Complete nonsense.

Just yesterday there was an article on Spiegel Online that the German craft industry is the most outdated sector in the country regarding technological advancement and level of knowledge (plus digression on the topic of digitalization). After 40 years of gas installation, that’s unfortunately no longer enough for more than a silly analogy.