>.. get some more insulation on the tank.
My hot water tank has the dipped foam insulation. Besides keeping the airing cupboard warm it also seems to be used for stopping the cold water tanks directly above it in the loft from freezing. The water tanks are covered with an insulation blanket but there is no insulation underneath them. The rest of the loft has about 300mm of insulation so I guess it might get a bit cold up there in winter.
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