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A bit early to be drawing that conclusion @Gilly.Another well thought out product from grippatank.
I know of a windie who does that although his r/o is indoors.also consider the thick walls of the 40/40 it would take some considerable heat to make a difference to the membrane,also the heat lost during the water passing through the ro and the need to replenish that lost heat.i can't see the logic either
heat tracing would be more efficient