Leak from CHS mystery outdoor pipe

[Eyattwop]

This is the side of my circa 30s house. You can see:
A. CHS drain off valve
B. Mystery pipe
C. Mystery pipe terminating into concrete, causing D. Big puddle (not labelled as pretty apparent!)

This leak happens when CHS is called, boiler pressure ultimately drops to near zero after 5-7 days. It isn't a rerouted blow off pipe - that's plumbed from the boiler straight outside on the 1st floor.

What is this mystery pipe that leaves my house and leaches water into the concrete floor outside??? Anyone know or seen this before?

 

[Harvest Fields]

Is it lead? Cannot see the pipe properly?

 

[Eyattwop]

Is it lead? Cannot see the pipe properly?

It's a bit of a mess but yeah I think it could be lead

 

[Eyattwop]

It's a bit of a mess but yeah I think it could be lead

Is it lead? Cannot see the pipe properly?

Just tried scraping the crud off the surface and now I'm worried that it's rubber! That can't be right can it? Then again I have no idea why any sort of pipe/hose would be here in the first place!

 

[Harvest Fields]

Please do not scrape any more? Is the electric meter on that internal wall. Also is the Blow off pipe for the boiler directly above that pipe?

 

[Eyattwop]

Please do not scrape any more? Is the electric meter on that internal wall. Also is the Blow off pipe for the boiler directly above that pipe?

The meter is at the other side of the house but don't worry I won't be scraping any more! The blow off isn't directly above - it's easy over a meter to the right and this puddling is very localised to my mystery pipe

 

[ShaunCorbs]

are you on oil?

 

[Eyattwop]

are you on oil?

No it's a gas combi

 

[Harvest Fields]

If it is rubber it could be electrical. If not it could be water.

 

[Eyattwop]

Bear with me - got floor up (girlfriend gonna love me doing this now...)