I noticed in Screwfix they have normal radiator towel rails used in a CH system. But they have electric immersion insertion heaters which go in the bottom rad valve tapping to use in summer as well.
I have a few questions.
Do these towel rail immersion heaters have a tee piece for the rad valves?
If I want the towel rail to be electric only and not connect to the CH, I assume I fill the towel rail with water. What happens if the towel rail immersion thermostat fails? Will the water boil and the rail blow up?