ᐅ Heat loss per meter in district heating pipelines—can it also be expressed as a percentage?

Oh, a heat pump. You initially mentioned something about a "district heating pipeline"?

So roughly calculate about 1% loss. That would be around 100 kWh (107.6 kWh) of heat, and if your heat pump has a coefficient of performance (COP) of 3.5, we are talking about 25 to 30 kWh (26.9 to 32.3 kWh) of electricity per year.

Or 3 watts of continuous electric power consumption throughout the year (our fiber optic modem, for example, has a standby consumption of about 4 watts).

The 2 m² (22 ft²) space for installation and movement area in the utility room will cost you about 5,000 euros for construction, while the garage should be about three times cheaper.

The 2 sqm (22 sq ft) parking and maneuvering space in the utility room will cost you about 5,000 euros to build, whereas the garage should be approximately three times cheaper.

How should your last sentence be understood?
I thought that all heat pipes installed 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 through this heat pipe.
Now I’m considering relocating the heat pump to the garage and using the heat pipe to the house. However, I still need to install the hot water tank in the utility room. With a 1% loss, this setup should be manageable.

Vwgolfcabrio schrieb:

I thought all heat pipes installed outside were called district heating pipes.

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

Usually, there are 2 pipes, but versions with one, three, or four pipes also exist.

You can also put your supply and return pipes inside insulation and, for example, in a PVC drainage pipe. This would allow for better insulation.

Vwgolfcabrio schrieb:

Now I thought I could move the heat pump into the garage and use the heat line to the house. However, I would still need to install the hot water tank in the utility room. With about 1% loss, this setup should be acceptable.

Does the heat pump have enough ventilation in the garage?
What pipe diameter are you using for your heat line? A small pipe won’t be sufficient. If you are using aluminum composite pipes, it should be 32/3 mm (32 millimeters / 3 mm wall thickness) pipe. Copper works with a 28 mm pipe. Installing the heat pump “just like that” in the garage isn’t that straightforward.

Axolotl-neu schrieb:

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

Usually, there are 2 pipes, but there can also be one, or three or four.

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

Does the heat pump have enough air circulation in the garage?
What pipe diameter do you have for your heating line? A small pipe is not sufficient. If you use aluminum composite pipes, it should be 32/3 mm (1¼ inches) pipe. Copper works with a 28 mm (1⅛ inch) pipe. It's not quite that simple to just place the heat pump "quickly" in the garage.

I have exactly this kind of pipe underground. I marked mine in red. It will be an air-to-water heat pump. For this, I don’t need an indoor unit. Only the hot water preparation needs to be inside the house, along with all the pipes, valves, etc. I intended to put those in the garage.

Vwgolfcabrio schrieb:

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

Then a monoblock unit should fit perfectly. Simply connect your district heating pipe to the heat pump. Everything else is installed inside the house (three-way valve for switching between heating and domestic hot water, filter, etc.). Of course, you will still need power and control cables for the heat pump (230V wiring is often sufficient—most monoblocks do not require more, except for high-capacity units).

What size air-to-water heat pump would you choose? The heating demand for the house is 5.7 kW. I want to keep the garage frost-free. Would a 5 kW unit be sufficient, or should I rather go for a 7 kW system? The Panasonic Aquarea models are said to be quite good.