Johnson & Starley Reno heat only boiler's , come with stainless steel heat exc's , decent company to deal with !!
Who stocks these transam, they look good. What sort of poppy are you paying??
we get them direct from J&S , there not bad people to deal with , same heat exc as Vaillant use , done about 50 I would say , just started useing the combi's done 4 so far , I will find out what we are paying & let you know !!