Ideas for frost-resistant water supply cistern?

I have one more after all: leave it as it is and turn off the pump during frost (at least that should be possible?!), and leave the valve open, if necessary blow it out with compressed air. Hoping that this will help a bit if the pipe freezes.

Where is the pump? Is this the only use of the cistern water? Just to clarify: We are seeing the current situation as it is built now?

Where is the pump? Is this the only use of the cistern water? To clarify once more: We are looking at the ACTUAL situation, how it is built now?

Hello Bieber,

The pump is floating in the cistern. What is shown in the picture is the actual situation. It was built that way.

This is the only use of the cistern water

In my opinion, you are only on the safe side if the pipe is empty in winter. There must be an inspection access to the cistern, right? You should be able to drain the pipe there.

Have someone explain exactly which type of backflow preventer was used. The valves often used in cistern applications allow the water to drain slowly.

By the way, I have never heard of/seen a floating pump. I only know submersible pumps that stand on the bottom of the cistern, and suction pumps that are installed above ground and suck up the water. Only in the latter case is a backflow protection necessary so that the suction line remains filled with water (this eliminates the priming process and you can always draw water after opening the tap).

Both systems enable "floating withdrawal."

.......
You could also decommission the pipe that is permanently connected to the house and set up a new withdrawal point independent of the house. This should also be drained in winter, but the damage potential is then orders of magnitude smaller.

That is the only use of the cistern water

Hello,
Have you thought about frost protection, just like with the car radiator.