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I've been converting our old electric heaters to newer ones.
The old 650w oil filled radiator/towel rail could be roasting hot in half an hour, so good for warming a towel but took forever to heat the bathroom.
The 700w new one is a great heater taking the bathroom from 17deg overnight temperature to 21deg in about 30 minutes.
The bottom half has less power so warms the towels a bit, without compromising the heating too much.https://www.herschel-infrared.co.uk/product/select-xls-infrared-towel-heater/
My only thought.... Where are your towels going? I know with that layout if I put a towel rail by the shower I would always get in the bath then realise they were out of reach and vice versa...