Thanks for the help all, in the end I plumped for the vaillant ecotec plus 837 as I can get hold of it by wednesday and installed by friday.
Once again thanks for the help and advice.
Regards
The combi boiler in my elderly parents house ( Saunier Duval) packed up over the weekend. It was around 12 years old. They reside in a 3 bedroom mid terrace house with a bathroom/shower and a separate electric shower. There are 9 radiators.
My mother is partially sighted and old man is...