I prefer to use the bulk of the distillers in the winter months as a method to "heat", example, I built a new building to put all herbs in, a central location so to say....in that building I used distillers for the heat source, the propane furnace never kicked on even when it was below zero outside. I actually opend the windows while working on some days.

I have always suggested people buy two 12 gallon capacity water distillers and seek to have a few dozen customers to buy your water. Sell your water at cost or a mild profit and have no expense in your winter heat.

Otherwise you are correct, you could preheat your incoming water above your distiller. I personally run the incoming water through the common hot water heater first.

MH