Conversion of gas boiler to heat pump

I already asked the questions. 1. Which heat pump would you recommend (ground source or air). 2. Where can I install the heat pump. A) in the house, where the gas boiler is now or B) in the garage, unfortunately the heat pump cannot then produce hot water because only a cold water line runs to the garage. Or are there options? Otherwise, I would prefer the garage.

You should ask around in your new development areas how these things have been running for the past 2-3 years, We have rather moderate temperatures and yet in 8 years the pump has broken down twice. And as the previous speakers already say. Feel free to recalculate! The heat pump also needs an energy source. By the way, that is called electricity! That will also catch up eventually.

Short calculation to think about.

9000kw x 0.15cent gas is 1350 euros per year.

The installation of an air-to-water heat pump costs roughly 20000 euros according to what I currently read. If there are any at all.

This will cost you approximately 800-1000 euros in electricity per year. There are currently no heat pump tariffs anymore, except for the old ones.

By the time you have saved the 20000 euros, the heat pump will have broken down beforehand.

So currently, it’s better to familiarize yourself with the topic of hydraulical balancing. Lower the flow temperatures and lower the hot water temperatures.

If you have exhausted all that, the electricity price will have surpassed the gas prices.

Currently, buying an air-to-water heat pump with a Kfw 40 house is neither ecologically nor economically nor otherwise sensible. And in case of gas failure, the heat pumps will also be remotely switched off, electricity grid overload.

In case of doubt, you take the air-to-water heat pump away from someone with an old building, who has twice the heating load as you and saves twice as much CO2 and gas as you.

Much more important and urgent: Your consumption sounds high for Kfw40. Is the thermal balancing done, room thermostats deactivated, heating curve lowered to the minimum?

Hot water temperature lowered, circulation hopefully not present or only active for a few hours?

Just as an addendum. I have a 25kWp photovoltaic system with a 10kW storage. Therefore, the air-water heat pump should be even more worthwhile. Why are the outdoor units from German manufacturers so huge while those from the Far East are significantly smaller?

Google your NAT at home. I assume that an air-to-water heat pump will easily be sufficient. But that has already been said.
I wouldn’t supply the garage, but rather install a split air conditioner there. Just frost-free is enough.
For the heat pump, a monoblock. For the design, you need a heating load calculation.
If I see the consumption including the garage, a 5 kW heat pump will easily suffice.
Then read up a bit on the topics of thermal balancing and setting the heating curve, and everything will be fine.
oh yes, with the monoblock, you don’t need an indoor unit.

I have googled my NAT. -12.4 degrees.
I have a district heating pipeline and radiators in the garage. My garage is somewhat larger, 3 rooms with 110 sqm.
How is domestic hot water generation managed with a monoblock?

I googled my NAT. -12.4 degrees.
There is a district heating line and radiators at the garage. My garage is somewhat larger, 3 rooms with 110 sqm.
How is the hot water production managed with a monoblock?

By a switching valve, controlled by the heat pump.
With radiators in the garage, this is an absolute efficiency killer for the heat pump.
To what extent is the garage insulated?