Heat storage tank only?

[dilligaf]

Is it okay to use the boiler to heat the storage tank only whilst the central heating radiators are drained on with a conventional system?

 

[fowlerboi]

If you're on S plan (2x 2 port valves) you need to keep the pipework filled but rads can be removed. Y plan (3 way valve) you would need to remove the rads and put in at least one link between 2 fully open rad valves.

You may struggle with tons of air in the system as there won't be rads to catch it, you would be better doing 1 rad at a time if decorating or if you're replacing them do it in a couple of days and drain the lot. Use the immersion heater in the mean time. Don't leave it drained for more than a few days

 

[ShaunCorbs]

No you can’t would need to refill

 

[dilligaf]

If you're on S plan (2x 2 port valves) you need to keep the pipework filled but rads can be removed. Y plan (3 way valve) you would need to remove the rads and put in at least one link between 2 fully open rad valves.

You may struggle with tons of air in the system as there won't be rads to catch it, you would be better doing 1 rad at a time if decorating or if you're replacing them do it in a couple of days and drain the lot. Use the immersion heater in the mean time. Don't leave it drained for more than a few days

I have got a 3 port valve and the hot water cylinder is fed by the cold storage tank so I would have thought if the setting for the boiler is on heat water only with the central heating switched of it would be okay?

 

[fowlerboi]

No

When the hot water achieves temperature the valve will shut but pump overrun will have no where to go because 3 port valve systems don't have a bypass. Again air issues will be your biggest concern