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You can mount PTC elements horizontally but non-ptc should be mounted vertically because the safety cut out is at the tip, that way if the radiator runs dry the tip is exposed first. PTC types have distributed sensing and can be safely run dry.
You can get 500W and I think 750W elements but they won't fit new panel radiators.
All towel rail elements will limit to a set temperature. On ones with an external control you can adjust that but you pay a lot for that feature. So if you could fit elements to these radiators then then would run at max power while on. You have to manually switch then on/off as required or you'd need to wire them into a separate thermostat/controller which would turn them off when the room was warm. If you went for a controller+thermostat then you could also set them just to operate in the mornings.
We only have the heating element and no other water feed to the towel rail so in effect it's a sealed system.