Copper pipes outside wall , any idea?

[plugin12]

House has 2 clipped together copper pipes running on an outside ground floor wall top to bottom , about 3 inches above floor level going into where the roof starts (eaves , so it does have a first floor but roof extends all the way to ground floor at the sides) on the other side of the wall is a bathroom with the sink and toilet directly left and right of where the pipes are and the shower on the opposite side . The boiler is on the other side of the house.

I don't know much about the stuff but it can't be water pipes can it? Surely they would freeze,?

Any ideas ?

Possibly a gas pipe. My house has one that runs along the front of the house and into the living room for the gas fire. Copper pipe. I assume in our case its because the ground floor is all parquet and the gas fire was put in later.

My hot water tank overflow pipe is like that

We have a copper gas pipe along side of extension into the kitchen for the gas range