Keston alternative

[thomas donovan]

customer has a 3 year old c55, an absolute heap! what would you guys fit as an alternative? bearing in mind that most customers don't want low loss headers in their utility room?
all input/advice much appreciated

 

[Chalked]

Vaillant ecotec 65?? And a plate hex? Would be better throgh a low loss header tho. Or 2 24kw sysem boilers.

 

[lame plumber]

anything apart from a keston