S
spudulike
A 30CDi requires 3.4 cubic metres of gas per hour to operate correctly. A 6m length of 15mm pipe (which is what you will have when adding in fittings) can only pass 1.9 cubic meters of gas so your boiler is working at just over half capacity at around 18kw.
The situation is made even worse as you have a fire and cooker and could lead to a situation as Kirk said where the other appliances are starved of gas.
Get him to do a gas rate of the boiler whereby you turn the boiler on to high rate (hold the chimney sweep button for about 10 secs) and time it at the meter.
Eg. A rough (but near enough) guide is
Metric meter (m3) time it for 2 minutes then multiply by 321 = kw
Imperial (ft3) 1092 divided by the time for 1 revolution of needle = kw.
You will need a 22mm pipe from meter to the boiler (22mm is stated in the manufactures instructions).
Tamz - Thanks for this and to other posters' replies. I'm now convinced he needs to upgrade the pipe. Are there any pipe sizing regulations I can quote to block any objections he might have ? Sure I've seen these in a previous thread but can't remember where.
The other thing I was thinking of doing, if he refuses to change the pipe, was to get an independent inspection done. Any ideas on how to do this ?
Thanks again