Used heating in new construction

And why does nobody install a used system for you? Probably because they want to sell a new one!

If something is defective after installation, you confidently turn to the installer and tell him that he should assume liability since he performed the installation.

For exactly this reason, hardly anyone will be found to carry out the installation (maybe check MyH... or ebayKleinanzeigen).

So my last/current very expensive Brötje heating system never had a real defect in 18 years. Therefore, I would be willing to bear the cost of a repair for a Brötje myself.

I am surprised that the installation of used heating systems is such an exotic topic...

The reasons have now been mentioned... - Where should one get a used heating system from? - a good condensing boiler costs €1500, what is there to save? - for understandable reasons, no one installs a used device for you

So my parents also once had a used oil heating system installed in a house that was less than 10 years old. The situation was that they initially lived in the house as tenants, and a novel electric heating system had been installed as a test object, with a discount because it was not yet a mature system. When the house (previously basically a company apartment) was then sold and my parents therefore had to buy or move out, they decided on the former, but it was clear that the electric heating had to be removed because otherwise it would have become too expensive. At that time, my father was already considering a heat pump, but the system was still in its infancy and had some teething problems, so he preferred to wait a few more years. For the meantime, a used oil heating system was purchased and then replaced after a few years with an air-to-water heat pump.

I wouldn't know why anyone would replace a nearly new, smoothly running heating system and then sell it again for a fraction of the purchase price? I'm not saying it doesn't exist, of course you can probably get a bargain on something like that if renovations are being done somewhere and the old system was then undersized and therefore removed. However, you have to make sure that the documentation complies with the Energy Saving Ordinance, making the heating system approval-capable, and that there are no defects or other problems with the unit.

- a good condensing boiler costs €1500, what do you expect to save?

Ahem, but surely we are not talking about a heating system with which I can heat 140sqm, let alone also produce hot water?

With such a (gas) heating system, I rather have amounts above €4000 in mind...