Losses in district heating pipeline per meter, also possible in percentage?

Oh, a heat pump. You first wrote something about a "district heating pipeline"?

So roughly calculate with 1% loss. That would be around 100 kWh of heat and if your heat pump achieves a coefficient of performance of 3.5, we're talking about 25 or 30 kWh of electricity per year.

Or 3 watts electric continuous power throughout the year (our fiber optic modem has a standby of about 4 watts).
The 2 sqm parking and movement area in the utility room will cost you about 5000 euros to build, the garage should be about three times cheaper.

The 2 sqm parking space and movement area in the utility room will cost you about 5000 euros to build, the garage should be about three times cheaper.

How can your last sentence be understood? I thought that all heat pipes laid outside are called district heating pipes. Currently, I still have a gas boiler in the utility room. It heats the house (underfloor heating) and keeps the garage frost-free (via this heat pipe). Now I thought that I could also move the heat pump into the garage and use the heat pipe to the house. However, I still have to install the hot water tank in the utility room. With 1% loss, this setup should be bearable.

I thought that all heat pipes laid outside are called district heating pipes.

No, there are special district heating pipes. They look like this: Usually 2 pipes. But there are also versions with one or three or four. You can also put your supply/return pipes in insulation and, for example, a KG pipe. Better insulation would also be possible there.

Now I thought that I could also move the heat pump to the garage and use the heat pipe to the house. But I still have to install the hot water tank in the utility room. With 1% loss, this constellation should be manageable.

Does the heat pump have enough air to breathe in the garage? What pipe cross-section do you have in your heat pipe? A small tube is not enough. If you use aluminum composite pipe, it should be a 32/3 pipe. Copper fits with a 28 pipe. It’s not really trivial to just "quickly" put the heat pump in the garage.

No, there are special district heating pipes. They look like this:

Usually 2 pipes. But there are also versions with one or three or four.

You can also put your supply/return pipes in insulation and, for example, a KG pipe. That would also allow better insulation.

Does the heat pump have enough air to breathe in the garage?
What pipe diameter do you have in your heating pipe? A small tube is not enough. If you use aluminum composite pipe, it should be 32/3 pipe. Copper fits with a 28 pipe. It's not quite trivial to just "pop" the heat pump into the garage.

I have exactly such a pipe in the ground. I have marked mine red. It is supposed to be an air-water heat pump. For that, I don't need an indoor unit. It's only the hot water preparation that, of course, has to go into the house, along with all the pipes, valves, etc. I wanted to put those in the garage.

I have exactly such a pipe in the ground. I marked mine in red. It is supposed to become an air-water heat pump. For this, I do not need an indoor unit.

Then a monoblock fits very well. Simply connect your district heating pipe to the heat pump. Everything else inside the house (three-way valve for switching heating/hot water preparation, filters, etc.). Of course, you still need power and control cables for the heat pump (230V cables are often sufficient – most monoblocks do not need more (of course, high power ones do)).

What size air-to-water heat pump would you choose? The heating demand in the house is 5.7 kW. I want to keep the garage frost-free. Is a 5 kW unit sufficient here, or should I rather take a 7 kW device? The Panasonic Aquarea are supposed to be quite good.