"Nis" wrote in message
oups.com...
Hi all,

Currently when i set my back boiler controls to 'Hot water only', the
radiators in the top half of the house (apart from the bathroom where
the water cylinder is) come on. The radiators get warm very quickly -
in a little over 20 minutes. However, the hot water takes 2 to 3
hours!!! and i reckon this is probably because the hot water is being
diverted to the upstairs radiators.

I've read that an 'anti gravity valve' might prevent this problem (my
system is gravity based). Would that be the best way to go, and do you
reckon the hot water will then be available faster since the radiators
won't be drawing it off?

Fit TRV to the radiators so they shut off (if not fitted already). In the
summer the valves will be closed to no heat will be lost.

In my last house I fitted a 22mm flow valve (from Jayhard) in the in the
back boiler space (you fit it in the CH circuit to prevent the CH
circulating if the pump is off, I think, a long time ago it was....). I
ended up removing it (compression fittings so quite easy) as the house was a
lot colder until the heating switched on, as I missed the gentle background
heat it provided upstairs.

Put the HW on earlier if worried.