Boiler gas inlet 22mm vs 15mm - why?

[LankyPaddy]

Chatting to our plumber today and he said he'd noticed how "European" boilers (ATAG, Viessmann, Vailant) all have 15mm gas inlets, but Worchester Bosch has 22mm.

Why?

Could it be that on the continent mains gas is supplied at a higher pressure, so 15mm is sufficient?

 

[adlplumbing]

no as they are designed for uk market and thus needs to be set for our market reason is their cheaper boiler so some cost are cut and having small restriction next to boiler will not make much problem as long as the rest is done correctly

 

[Agile]

So the manufacturer can make more profit.

 

[commercialman]

WB 18 RI has a 22mm/3/4" gas inlet connection wherby the ecotec 831 uses a 15mm gas inlet , further restricted by the service valve supplied , all very strange.

 

[Gasman77]

All of the Viessmann 100 combi/systems are now 22mm - no sure about the OV

 

[boilerdoktor]

So the manufacturer can make more profit.

how do the manu's make a profit from sales of 22/28mm copper???

thats rubbish and ill thought out!

 

[Agile]

Dont you think that a 15mm inlet connection will be cheaper for the manufacturers than a 22 mm?

More brass equals more cash!

Well in London anyway!

 

[hansthebear]

my answer would be "to promote appropriate gas pipe sizing"

 

[adlplumbing]

So the manufacturer can make more profit.

how do the manu's make a profit from sales of 22/28mm copper???

thats rubbish and ill thought out!

one the question is 22mm or 15mm not 28mm
and 15mm is cheaper
and that the answer

 

[mickyg]

my answer would be "to promote appropriate gas pipe sizing"

thats a polite way of saying that manufacturers think installers are idiots and cant size a pipe, so they have to "suggest" one for them Don't blame them tbh, the amount of undersize pipes you see about

 

[bengasman]

Viessmann has 22 mm gas connection.
WB is European too.
There are virtually no boilers made in this country any more; a few obscure makes, and the rest is imported or "at best" assembled here.