Hello

I've never had a heated towel rail before so If these questions seem
daft I apologise now.

Anyway......My towel rail heats the room to 24 and that's way too warm.
The towel rail has two valves at the bottom each marked with a "-" and a
"+" symbol. These valves say "bar" on them so I take it that means
pressure. If I turn the valves towards the "-" sign the towel rail does
get less hot but makes a continuous hissing noise. There is no hissing
noise with the valves both fully open. Is this hissing noise normal?

Also, is it ok to turn both valves at once or doesn't it matter?

Finally, I take it I can turn the valves to my heart's content and it
will make no difference to the heating in the rest of the house.

Thank you.