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Depends how much warranty you want and how much hot water.
Main is 5 years, 600 is 7 and 8 is 10 years and all are the same boiler. We've fitted maybe 200 at this point between them and are really haven't had many problems.
A combi will always have a reduced rate and have to throttle it back to get hotter 12l/m at the above which is plenty. If you want to let it rip and want tons of HW stick in a Platinum 40 for 4 odd litres extra a min but you'll pay extra for it.
konastab01
ectoplasmosis
Thanks; any specific ~30KW model to look out for? Would like to be able to comfortably have the heating on (3-bed, 8 rads, single bathroom) and do the washing up whilst someone showers.