"harry" wrote in message
...

Insulate the pipe.

Waste of time, it will still freeze.
The best insulating a pipe will do is delay freezing.
If the average temp around the pipe stays below freezing the pipe will still
freeze even with a foot of insulation unless you input some heat from
somewhere.

My parents used a paraffin lamp for years but as they got older it became a
chore and they did get pipes freezing in the outside loo because the oil ran
out.
In the end I persuaded them to fit a B&Q electric heater with frost stat
£10. Only 300W and only on when its cold so it cost less than the paraffin.