I doubt you have a 220 stat, but time to check it in a pan of water on the stove to see for sure when it opens, or just replace it [but check the new one before installing!!] - as Tim sez, 180 is the highest rating you want .... but your rad sure is working well thumbs_up

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics