How to fit/change Electric Element on Towel Radiator

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Hi

I have a delonghi electric towel rail. It has a basic on/off setting with no thermostatic or timer control
I want to fit a thermostatic element so I can control the temperature and timing.

I have bought a TERMA KTX-4 with the electric element that comes with it. This was recommended by the shop where I bought the towel rail. The supplier told me to fit the element I should
1. Disconnect the towel rail from the electrics
2. Unscrew the current electric element
3. Screw in the new electric element, which the thermostatic control connects to

But
When I got to step 2, I couldn’t unscrew the current thermostatic control. When I bought the towel rail the electric element was ready fitted (factory fitted).

My question is
a. Should I continue and unscrew the current element. (pic A). Its not a perfect hexagonal shape. It is curved with 2 flat edges (pic A). Is there a specific tool I should be using. I've tried spanner and pliers as a last resort.
Thanks

OR
b. Can I fit the element to the other side (pic B) and leave the current element in.

OR
c. Is it not possible to fit this at all

Appreciate any advice
 
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you need to be unscrewing the hexagonal part, a spanner is ideal, pliers however are not.
 
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you need to be unscrewing the hexagonal part, a spanner is ideal, pliers however are not.

Thanks for replying John
Does that mean i leave the other element in, including wire for the electrics?
 
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You could do as b) but I don't know if they leave any air in the radiator for expansion (????) which you may just push all out with a second element.
 
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