innie or outie ? (actually; uppie or downie?)

[slowlybutsurely]

I'm about to fit an outside tap (to catch the last few weeks of summer).

Water source is an interior 15mm pipe; then will have a 3m, surface-mounted run inside heated room to an exterior block wall; then tap outside. I'm going to use plastic 15mm pipe; appearance doesn't matter; frost protection does.

I can slope the 3m run up, slope down or curve upward or curve downwards. Assume stop valve at the source end. Vent or drain valve anywhere.

I figure if I curve the run upwards and have a vent valve at the peak, I can drain the cold side out though the tap.

Or

If I curve the run downward and have a drain valve a the lowest point, I can drain the cold side through valve.

Which is better? Any other options? Your opinions and thoughts please..

TIA.

 

[ScottishGasMan]

If its mains fed which it should be and the 3m is internal it makes zero difference, its the external part thats the issue, keep external pipe as short as possible and fit an Isolating valve just inside the property where the pipe goes through extertior wall, that way in really bad weather you can simply turn the supply to outside off.

 

[Madrab]

Use one of these, provides the lowest chance of freezing I've found.

All the rest is inside, recess the wall covering inside a little to allow a push fit elbow to connect to it. Won't be the prettiest no matter what fitting is used to take it through the wall if it's push fit plastic.