I know the difference between them, I've owned both before. 1583 has a wafer thermostat and 1588 has the electronic. When I owned the 1588 I had to return it for a replacement as something went wonky with the thermostat within a week of using it. I can get either of these for the same price however I'm wondering what I should buy? I'm leaning towards the 1583 just because the wafer thermostat is easier to replace. Thoughts?