Which boiler ?

I am going to have my old combi boiler replaced, but I can't decide which new boiler to go for.

I have narrowed my choices to two boilers:

Vaillant Ecotec Plus 837

and

Worcester Bosch Greenstar 30 CDI

Can anyone please tell me which one is better and more importantly, more reliable ?

i.e. Which one will last longer before it breaks down ?

Also, would you be willing to install it and at what price ?

(Please leave your contact details)


Thank you