Hi, just had my old boiler replaced with a Vaillant eco tec 28, the boiler is in the bedroom, I don't have a drain outside to take the condensate away, the heating eng has run a pipe down the wall, dug a hole put some lime chipping in and Buried the pipe in the ground, I told him wasn't there a cylinder to go in the ground, but said it would be ok the way it was, can you please advise.