I am putting a heated towel radiator in the bathroom. Turned off water
and released central heating stop valve. Waited nearly 2 hours for
level to go below bathroom level. Attached pipes to radiator and am
now sitting here (another couple of hours) waiting for the system to
fill so can check for leaks.
Is there some way to speed things up?
When draining I opened air valves on the upstairs radiators but it all
seems so much slower since going for the thermal store arrangement.
Until last year we had gravity fed water supply from in the roof space
and the whole lot including central heating, was drained in 20
It's now over 6 hrs and still not enough water in the central heating
to test connections. the water flow into the cylinder is a trickle
even though the household water taps are delivering water at full
Eventually completed the check at 9.30pm. While waiting I put on a
couple of isolator valves just in case the radiator wasn't correctly
fitted. Couldn't cope with another wait like that.
There must be some valve next to the cylinder which would allow for a
better inflow of water but the instructions don't cover draining the
Could you give a little more detail on how your store is configured?
i.e. is it heated directly or indirectly? How is heat extracted from it?
(i.e. coil, PHE etc). How is it filled? Is it sealed, or vented? Is the
heating and hot water configured as Y plan, S plan etc? 
These will all have an effect on what mods are possible to fix the problem.
Thanks for your reply John.
Central Heating is Directly Heated by Coil in a Vented system. Its
non-zonal, temperature being controlled by one thermostat in the
Hallway. This covers the heating of 16 radiators which are turned off
if not required (although about half have thermostatic control
valves). The water is filled via an Albion Mainflow Cylinder.
Unfortunately I am no expert with Central Heating technicalities.
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