701 512 3 for zone 2 says switchgear and accessories may not be installed in zone 2 there are some exceptions for selv and shavers but not a towel rail.
Bathroom electric towel rail regulations.
The minimum ingress protection rating here is ipx4.
This zone has the same requirements as zone 1.
Zone 2 stretches to a 0 6m outside your bath or shower and above your bath or shower if over 2 25m.
If you were to install a heated towel rail in this zone it would need a rating no lower than ipx4.
But if you do have an electric heater it must be fixed at a safe distance from the bath or shower.
Heaters and towel rails central heating is the safest way to keep a bathroom warm.
However the main part of the wiring has been done by a electrician and is up to regulations recently required.
This is the area above or either side of zone 1 extending up to a height of 3000mm and extending horizontally to 600mm.
Alternatively put the towel rail in zone 2 with a sw spur or isolator switch more than 600mm from the bath shower so that it is no longer in zone 2 but still near the towel rail.
I am not an electrician and want to wire in a electric heated towel rail.
Only separated extra low voltage selv devices are allowed in this zone but any transformer must be located beyond zone 2.
Electric and gas water heaters in a bathroom must be fixed and permanently wired unless they are powered by a socket fitted three metres from a bath or shower.
Zone 1 is the zone above your bath or shower to a height of 2 25m.