Who installs heating systems from the network?

If a car mechanic wants to charge me 100€ per hour, I would feel more like being ripped off than when I pay 35€ for the oil...

That is also fine, but I simply cannot expect a craftsman to install my cheaply purchased stuff cheaply, or even for free. They need to make a living as well, and that is not possible by only charging for the labor. And it doesn’t matter whether it’s oil or heating.

You are right, that was not what I meant to imply with my post either.

Isn't it the case everywhere that things purchased through a wholesaler are more expensive? I have personal experience with this. Whether it's sanitary, heating, electrical materials, or car spare parts. Even though I don't know the wholesale prices of everything (but of some), I can't imagine that the plumber, car workshop owner, etc., pockets the difference compared to prices from the open market. Wholesalers probably argue that they keep the items in stock and can deliver them within a day. But shipping commerce doesn't take much longer either. However, when I see, for example, that a glow plug in the car workshop costs 4 times as much as on the internet, or a toilet seat at the plumber costs 210€, while it's 90€ online, it's pretty strange. I've seen the wholesale prices for electrical switchgear material, and they were already more expensive than in the open market. On top of that, the installer's margin was added.

I also procured and installed my heating system myself with the help of the HTD. I laid the entire underfloor heating myself as well. However, a well-known heating engineer supported me with the rest of the installation. You simply don't have all the tools and materials yourself. And you also don't have all the small stuff that the heating engineer has in the car. With the experience I have now, I would do it completely myself next time. But unfortunately, you only gain experience afterwards. There might be heating engineers who would connect it for you. Or can't you just buy "underfloor heating with piping but without a heat pump"? Then the heating engineer wouldn't have to provide warranty services for the device either. Installers are also listed in the Aquarea Club.

Yes, but why not? If a brand workshop charges an hourly rate of €100 and passes on all material costs with a small handling surcharge, why shouldn't it be able to make a living from that?

If that is really the case, then the hourly rate is simply too low. The total amount is the same in the end; one time I am satisfied, the other time I feel cheated.

This is also called mixed costing.

By mixed costing, however, I understand something different, namely between costs of the same type. For material costs, no mixed costing is necessary, since purchase prices/expenses are known exactly in advance.

Oh yes, the world is so evil, evil, full of evil craftsmen, the client the victim victim.... and everyone so smart that they know how to calculate.... At the end of the day a power question. and the one who knows how to install and can do it also has the power. Period. Karsten