The higher the wattage the more heat they can put out and more they can dry. I think the 1000 watt Nesco (American Harvest models 10xx) says that you can stack up to 30 trays, but it only comes with 4-8 (you get screwed by having to buy more shelves to reach the theoretical limit of the heater). Their smaller model (Snackmaster?) is only a 4 or 6 shelf at 600? watts, expandable to ??? The 9 shelf Excaliber, which many people think of very highly (i.e. "burned out my 3rd Nesco shoulda got Excaliber") has a 600-700 watt heater but is not expandable..but the overall capacity is large).
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