Follow-up to Heated(electric)Towel Rail

One possible snag with your plan is that there is no provision to cope with expansion of the fluid, unless you leave a deliberate air space, which would mean that the top of the radiator would be cold. Not sure how it would be for corrosion either.

Chris

How much expansion do you expect from a two hundred watt heater in a towel radiator? The pressure in a combi central heating system may rise up to 3 bar when hot and most rads will take much more before leaking. I have seen plumbers presure test up to 5 bar when they commissioning systems. As for corrosion then use central heating inhibitor in the radiator as I pointed out on the OPs first post asking the same question.

Adam

Thanks, I was thinking of leaving approx 2cm gap inside for any expansion, plus what about adding a mixture of 25% of anti-freeze to 75% of distilled water? Comments please. T

You could just leave the bleed nipple open, like a tiny vented system, although you'll have to change the inhibitor every few years (just like a vented system too).

Central heating inhibitor with antifreeze is available, if you think there's a risk of freezing, e.g. Sentinel X500