DIYbanter - View Single Post

wrote:
Is a 25' run of 15mm supply pipe acceptable for a new boiler? Thats gas
supply, not electric

Doubt it. My boiler's about 18 whatnots and the manufacturers specify
22mm pipe to within about 12 or 18" of the boiler. There might be
something similarly specified in the installation manual for your
boiler. You can't calculate the pressure drop (which is usually the
criteria) without details of all the other appliances, pipe lengths,
tees, etc..