"Mike Barnard" wrote in message
...
Hi.

I'm looking at ordering a new combi on monday, but the maker offers
two flue pack options, a four inch and a five inch. Can anyone tell
me why there is a difference and which would be the better option to
choose? And maybe why?

The boiler is a Worcter Bosch Greenstar, combi condensing...

URL:http://www.worcester-bosch.co.uk/Ran...?ProductType=5

... and I'm thinking of going for the 35 model for the 14l/min DHW
flow. (Don't need a big boiler for the heating, just DHW.)

RTFM :-)
I think you'll find the 125mm flue is necessary for longer runs.