Combi boiler | Safety discharge pipe | Pushfit?

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Some idiot (;)) was painting the outside of the house. There were lots of old copper pipes protruding from the wall that were part of an old water cylinder installation.

These were all cut off and removed. The holes were filled with sand and cement and the wall was painted.

Unfortunately, it appears that one of these pipes was actually still in use - it was the 'drain pipe' from the boiler (not the plastic condensate pipe).

1673024860132.png


Is it safe to:

1) Replace the 'through the wall' section of copper pipe with new 15mm copper.
2) Connect the new horizontal pipe, to the vertical from the boiler, using plastic speedfit/pushfit pipe connectors?
3) Would compression be better?

Do the normal rules regarding only copper connections within x distance from the boiler still apply to this drain pipe?
 
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You can use compression afaik, wouldn’t recommend pushfit on it.
 

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