Financing construction of a single-family house in Southern Germany, 180m²

Now purely my personal opinion: the local heating network is the KO criterion. Leaving aside the 24 weeks (that is 6 months!) until you have a functioning heating system. The costs get even more exciting: connection fees, they don’t install the heat pump for free either, basic fees and so on and so forth. The municipal utilities are making a killing. But further: with Eff 55 (minimum standard) you have a heating load of about 4.5 kW due to the size. Now look at the units available out there. Hopelessly oversized, so they will never run efficiently, despite the inverter. That’s a point people will never understand with the municipal utilities. We need small machines, no longer the 18 kW gas boiler. Then there’s the photovoltaic requirement, you feed in at 8.06 and pay back 38 cents, now that’s what I call a business model...

The situation becomes even more dramatic if you speculate on kfw funds, so your heating load decreases even further because Eff 40.

Then of course the interfaces: You - municipal utilities - heat pump guy - your pipe layer - your electrician. If something goes wrong, one can blame the other. Well, congratulations.

As I said, my opinion.

Too bad, was too late: Edtit: and then take a look at the refrigerant in the cans: R 410 a ....

Now purely my personal opinion: local heating is the deal breaker. Apart from the 24 weeks (that is 6 months!) until you have a functioning heating system. The costs get even more interesting: connection fees, they don’t install the heat pump for free either, basic fees, etc. The municipal utilities make a killing. But further: at Eff 55 (i.e. minimum standard) you have a heating load of about 4.5 kW for that size. Now look at the units available. Hopelessly oversized, so they will never run efficiently, despite the inverter. That’s a point people never understand with the municipal utilities. We need small machines, not the 18 kW gas boiler anymore. Plus the photovoltaic obligation, you feed in at 8.06 and pay 38 cents back, I call that a business model...

The situation becomes even more dramatic if you speculate on KfW funds, so your heating load decreases further because of Eff 40.

Then of course the interfaces: You - municipal utilities - heat pump guy - your pipe fitter - your electrician. If something goes wrong, everyone can blame someone else. Well, congratulations.

As I said, my opinion.

You are absolutely right and that is exactly my opinion. I installed a Jeisha Monoblock 5kW in our current house with radiators for 180 m2 of living and usable space. My neighbor is a heating technician and said it wouldn’t work. Half a cold winter has passed and it works as intended. I was actually already looking forward to installing the Keisha. And yes, you’re right, they will never understand that. I once tried to find the minimum input power of the Waterkotte. That is crucial, how low it can go. I also hope the Waterkotte can be controlled via ioBroker or an API. Then I have to start programming AT-dependent timers again to heat the mass and then consciously switch off the WO. Another question is: what will the municipal utilities do if it doesn’t work? Then you’re stuck.

. Another question is: what do the municipal utilities do if it doesn't work. Then you're left standing there.

Exactly that. You have a gag contract with the municipal utilities. They smile at you and say it's your plumber's fault. The plumber says, no, it's the heat pump. The heat pump tells you, what do I have to do with you, municipal utilities.

Exactly that. You have a gag contract with the municipal utilities. They smile at you and say, your plumber is to blame. The plumber says, no, it’s the heat pump. The heat pump tells you, what do I have to do with you, municipal utilities.

I called the municipal utilities today. It seems that I can indeed determine the size of the heat pump, depending on the heating load. The series starts at 6KW. It doesn’t make it good overall but a bit better. But well.

[*]Obligation to connect to cold local heating (obligation to purchase Waterkotte brine-water heat pump with maintenance contract and electricity contract for the heat pump)
[*]

Hmm, either the municipal utilities are stupid, or they want to rip you off.

This is a water-water heat pump, not brine!! And on top of that, not an inverter machine, which makes it even worse.

Cut it off, have someone build it who will still feel the friction heat weeks later because they got ripped off so slowly...