How long if at all do manufacturers have to produce spare parts for boilers? Just asking as yesterday I found out potterton envoy's are now obsolete. They are condensing boilers about 10 years old. Where as potterton pumas g rated permanent pilots are still being produced. If I'd bought an envoy 10 years ago to be told now its obsolete buy a new boiler I'd be pretty ****ed off! It's clear they never sold that many so they don't produce the parts anymore, must sell loads of pumas so its worth there while.