On 28 Mar 2007 11:19:20 -0700, "Daljit"
mused:

Hi

A couple of dumb questions...

1. would there be any problem with reducing the condesate outlet pipe
from 22 mm to 15mm a couple of feet from the boiler, running it under
floorboards for approx 30 ft and then feeding into 40 mm kitchen waste
pipe? (trap in boiler)

If you want to reduce the condensate pipe size then AFAIAA your only
option is a condensate pump which will pump away in some small bore
pipe (10mm or so I believe).

2. how would i connect the 15mm pipe to the 40mm one?

You don't.
--
Regards,
Stuart.