I too are in the same position although I have not yet been threatened with legal proceedings. I too was under the impression that after the 7 year lease came to an end, the boiler would be mine. ASG have received £40k or more in RHI payments from Ofgem and are now trying to bleed us dry with ridiculously expensive options and claiming the boiler is part owned by them one of the options is that I pay nearly £3000 to buy them out. This is s total disgrace and RIP OFF!!