Adam Topp wrote:

Hi,

I have just acquired a heated towel rail, which, when looking at the
spec. is designed apparently for use on a closed system only. Our
system is open vented. What is the difference between a radiator
designed for use on a closed system as opposed to an open one. I
cannot see much difference but I'm now loathe to put it on the system
for fear of what it may do or damage may be done.

The instructions may be not so much about open or vented but rather
meaning it has to be used on a circuit rather than in the supply to the
HW taps.

On flats in North London built between the wars you will often find that
the towel rail is in series with the supply to the HW taps. The
radiators are made of brass throughout. This is for flat swith
_central_ heating in the true sense of the word. I.e. Industrial
boiler(s) supplying heating and HW through out the building.

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html