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So all hot water installations are notifiable...
unless testing and adjustment is not possible, or would not affect the energy efficiency of the fixed building service
Surely, then, that would apply to a normal, old fashioned, DHW cylinder? What can I adjust and test except the thermostat? The main energy efficiency (seeing as the cylinder always comes pre-insulated) would be in the proper horizontal run before the vent and the pipe lagging; the safety lies in the design of pipework. Both of which would be 'tested' by visual inspection, certainly not 'adjusted' in any way.
If I'm wrong, of course, then this makes a mockery of the C&G level 2 assessment in which you must design, install, and remove a hot water cylinder and header tank?
 

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