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Si Dale · Joined: 27 Apr 2007 Posts: 10 Location: Ascot

Hi There

I have just replaced an old bathroom rad for a towel rail. I am pretty sure it has its own branch as it comes on in the summer when the central heating is off.

Its all working well , however when I drained the upper level of the central heating, i.e header tank etc I expected it to drain all of the upper level rads as well (Note that i drained off from the bathroom itself), but it didnt, only seemed to empty the header tank. Why is this ?

Thanks
Simon

thescruff · Moderator Joined: 03 May 2003 Posts: 4164 Location: Bath

Its quite possible that there are two circuit an up and a down, if the up has risen into the motorized valve then it could be the answer.

Yellowman · Joined: 03 Jan 2008 Posts: 60 Location: Sussex

Plus if you didnt open the radiator vents on the upstairs rads they will still be full of water due the water being vacuumed.

Baxter · Joined: 13 Oct 2007 Posts: 18 Location: Bolton

Sounds like your bathroom radiator is taken directly from the primary circuit to your hot water cylinder. This was sometimes the case in older systems, and therefore runs independantly from the heating system.

Baxt.