I bought one from Wickes (made by Earlex) about three weeks ago & I
> wonder how I ever managed without it. Draining rads is now quick &
> clean, cisterns that dont flush are easy to empty completely. Changed a
> TRV on a system that would only partially drain down on Saturday - speed
> is of the essence !
Agreed, but if you misjudge it and the vac fills up and cuts off while you're still in mid-operation you're shafted :-)
Screwfix (used to?) to a vac that pumps water out as well as sucking it up which should be ideal for that sort of job, but it was quite pricey and I haven't got one :-(