It is not hard to remove a radiator and have done so many times in my own house where i know what is what. I don't get involved in other peoples houses however as i don't think it is worth the potential hassle of an air lock or messing about with filling loops etc.
I hav in the past been able to loosen the horizontal joints on either side then carefully lift the rad off its brackets rotate the rad downwards and rest in on a couple of buckets to support the weight and not strain the joints. Re-tighten the joints to stop any weeping tile behind then reverse above to put back...saves draining!
:47:Like your idea of saving time on the draining but this is not the way I would recommend anyone to do this! The radiators have to be lifted to get them of the brackets, you are putting pressure on the pipes to do this and increasing the chances of a leak. As for leaving the radiator on buckets, you must have really small buckets to allow the radiator to lay flat :yes:
If it's worked for you in the past, fair play mate, but I would have to agree with most, your insurance will most likely not cover you for this, and regardless of what the customer says about them allowing you to do this, if they have a leak when you're gone, I guarantee they will hunting you down for repair costs :84:
I know people want to keep the customer happy, but if you explain the issues, they will understand and honestly, they will think more of you in your professional approach in these matters .