I currently have a solar heating system that has a controller with about a 10 degree variance. If your house thermostat worked like this thing, you would take a sledgehammer to it. The setting that turns on the heat at 79 wont turn off until its over 90. I'm looking for a digital controller with a much finer (2 or 3 degree) variance.
The pentair solar touch seems like an affordable option. I'm wondering if any forum members have any experience with this unit.