Is 15mm pipe ok for the rising main supply to the combi?

[midknight]

My A30MFF1 boiler has a 15mm water supply pipe to it (there is 25mm blus poly to the house)

Is this big enough?

Behind the 15mm cold supply pipe valve to the boiler there is a copper elbow. On this elbow a 10 or 12mm stub has been soldered or brazed

Is that a standard fitting and will it be strong enough for cold water pressures?

The stub then has a valve and the filling loop on it.

Many thanks for any help

 

[powell30]

15mm is adequate. Most combi's would struggle to cope with higher flow rates in order to achieve the 35' rise for hot water.

I assume the 'stub' is the filling loop. As long as it's soldered correctly it should be fine but not ideal....15 to 22mm heating pipe (via reducing coupler) is more the norm but you should be fine