For some reason, there is an exposed pipe in my kitchen that feeds
the cold water supply to the tank. Is it feasible to reroute this by
burying it in the plaster of the wall and if so, does it need to be
insulated (and if so - with what)? Or, as it is only an inch or two
from the wall in a corner, would it be better to just box it in?

TIA

Regards,

Nemo