Before buying one make sure you have checked out eco boiler replacements schemes. Loads to choose from on google, dont buy if you can get one for free
No such thing as free.
Either they will have an interest in your house(if they are recieving the rhi payments) making it hard to sell as many mortgage cos dont like this.
Or youll be tied into nice expensive fuel like the calor lpg offer , nice free tank and boiler , nice expensive fuel.
No experiance of ideal but ime of worcester , they are worth the extra – how ever i have been oil for the last 5 years. On various boilers but my parents put a worchester 35 in when they moved into current house 14 years ago… Still marching on no issues.