CH drain into waste pipe ?



Hello group,

Is it practical/advisable to have central heating drain pipe going
into house waste system? I have an access to plastic waste pipe (bath)
on quite a low level and CH pipe is nearby.

If it is - do I need to install U-trap and/or provide an airlock? Also
how do you connect copper (15mm) to a waste (40mm) pipe ?

your help is appreciated,


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