probably a worcester 37 cdi but expensive ... value for money opt for a main eco 30

In my opinion, it's a vaillant. It's the boiler I recommend every time, I've fitted loads and never get called back with and boiler related issues! Mid/high price range but you get what you pay for.

gotta agree.......anything in the Worcester Greenstar range.

the viessmann 100 30kw , comes with a 5 year guarantee

hi the best condensing boiler on the market is the worcester bosch cdi but different fitters prefer different boilers and depends if you want a combi or heat only and the size of your property. talk to a few plumbers for the best advice.
thanks adrian

Worcester are crap nowa days. Viessmann 200w with a HO1A controller or alternatively the 100w with weather compensation as PK has suggested

check out the new ariston range with a 5 year guarantee

Worcester are best value. Viessman are pricy but very quiet. You really do get what you pay for but I always use Worcester if budget allows.

Probably the one with the biggest guarantee & best after sales ,boilers usually last 10 /15 years if installed correctly and maintained ,be cautious of in my opinion stupid offers like fitted £999 boilers generally go for couple of years then breakdown and parts for some reason tend to be expensive. My Selection would be Vaillant ,Baxi