Boiler choice advice please

[greigwal]

Hi Folks, I'm looking for some boiler advice please...... I own a flat tenanted by students and the boiler's packed in, my mate who installs aga's & is gas safe is going to fit a new one for me & he's left the choice, ordering etc to me.
I'm after a 12kw heatonly & I've been looking about online and would like a compromise between £ & reliability! there's a baxi solo 12he, an Ideal logic 12kw & a worcester bosch within a £100 price of each other, thoughts/advice appreciated, would I be paying the extra for the name or are the more expensive really more reliable!?
Cheers in advance

 

[Halesowen1]

Out of those 3 you have gotta go with Worcester, yes they are dearer but yes they are more reliable.

 

[greigwal]

Cheers, Just looked at the technical sheet for the worcester Greenstar 12ri and the only problem I can see is that the gas supply into the existing boiler is 15mm(I presume the 22mm from the gas meter must be reduced somewhere under the floor in the flat) & the worcester manual says inlet is a 22mm. Will it invalidate the warranty or affect the operation if the 15mm was "steppedup" to 22 to connect to the boiler?