I would imagine the best way would be to totally box in the water plant , all sides top and base if possible , if me i would use studwork timber frame 2 inch celotex boards and then faced with OSB , then put the oil rad in with it all , just remember to have one of the sides on hinges so yo can get in !
What's this got to do with window cleaning???
Apologies - I flicked through this. I actually thought we were talking about some sort of growing plant in his unit lol.I need a day off lol. Feel free to take the P