The colour and design of a radiator can affect how well it conducts heat, so it is worth considering this with a choice of black towel rail. However, in terms of heating a bathroom or other small room, the difference between a chrome, white painted or matt black heated towel rail won’t be noticeable. Out of the three, a matt black towel radiator will provide the best heat conduction as polished surfaces are slightly less conductive, but the difference is minor when used in this context. Any choice of black heated towel rail electric radiator will provide ample heating for a room.