Re: Fridge sharing wall with airing cupboard
Hi
The water tank will be lagged I assume? If so 90{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} of the heat will be retained within. On the Fridge side 9cm is more than enough for door opening and for ensuring an air flow around it.
You then have the wall in between which should keep the two zones separate temperature wise. If the tank wall did become warm you could always fit a reflector layer on the wall.
HTH 🙂
Don