Bengas which current and in production boiler puts the condensate outlet into the flue.
Dunno, and don't care either to be honest. I would opt for a little pump any day of the week if push came to shove.
Its not that long ago, I think it isn't, that I read about it in g.i.
It turns out the op knows better anyway, so was a waste of time to advise him to get a proper installer who can solve his problem correctly and legally.
Oddly enough, nobody seems to have noticed that he has had a steamer for 2 years; must be a fair puddle under it by now. Methinks it was a complete cowboy job that is now going to be changed to another illegal setup.
As they say these days: whatevah.