I’m having a new boiler (Baxi 800 combi) fitted tomorrow. Currently there’s a hot water tank in the airing cupboard and a cold water tank in the loft, all to come out obviously. Question is should I empty the cold and hot tanks tonight to give the boiler guy a head start in the morning (I know how to do it, I replaced the hot tank myself about 10 years ago). Or would he just find it annoying that some amateur had been fiddling around before he arrived?