This is the thermostat I use on my oil-filled radiator, also. It's fantastic! Never more that a degree of variation, and I have a large window in that room that plays hell with heating in the winter. OP, I strongly suggest that you invest in a Johnson thermostat, rather than trusting the cheap crap they build into those heaters. I have my heater set at ~88deg with the built-in (back-up), and the Johnson set to 79deg as the primary. Obviously, I use belly heat as well during the winter, but in the summer that room hits a steady 86deg without any supplemental heating at all.