Be careful with the RO membrane, the polymer that most of them is made of will stretch and change it's permeability under pressure and heat around 120F (well below most home water heater temps...) This will change the ability of the membrane to reject ions from the filtrate (in other words, it will ruin your membrane) My experience with many of these (we have a ton of them at the different locations at work) has been that they work well enough with winter water, although it will be a little slower, They will still work fast enough for you to flood the kitchen floor, even in the winter, TRUST ME on this :

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[ 05-27-2001: Message edited by: tdwyatt ]