ChatterBank1 min ago
central heating
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For more on marking an answer as the "Best Answer", please visit our FAQ.This job could be carried out without draining-down the system - you would need to hire a "freezing kit". This could only be used on the proviso that there is enough exposed flow+return pipework to the radiator to fit the freezing clamps.
Should you decide to drain-down your system to carry out the re siting of the radiator, be prepaired to encounter problems - not necessarily with the piping up to the radiator, but eradicating any air-lock problems.This problem may not just involve the resited radiator, but other radiators on the system could become air-locked.
All the above will not apply if your system is "pressurised".
I would strongly advise you to have a heating engineer/plumber carry out the work unless you are a very competent diy'er.