In message , "Roger Mills (aka Set
Square)" writes
Assuming your CH is pumped, an anti-gravity valve would certainly stop the
upstairs rads from getting hot by convection when the pump was off.
Ah ha! This might solve my problems too, since a mod to the pipe
routing in our house the upstairs radiators suck all the heat out of the
oil fired combi with the pump off with a detrimental effect on the time
to deliver hot water - is there an 'official' name for an anti-gravity
valve or is it simply a non-return valve. What would I call it if I
were to search, say, Screwfix.
Cheers,
Andy
--
Andrew Sinclair
http://www.smellycat.org