Flushing a closed central heating system

[aris]

I've got a closed central heating system with a combi boiler. I added some fernox restorer last week and would like to make sure it is all flushed out.

There are two valves which I used to drain the system down with - but gravity doesn't always do its job fully when draining it down by opening the valves on their own.

I thought that if I open both of the draining valves, and then opened up the tap which I use to top up the closed system with water, would that effectively flush out the whole closed system.

Am I being naiive? :-)

If not, what would you all suggest as the best method of fully draining the system?

Thanks,

Aris

[Ed Sirett]

This method can work very well if the mains is up to the job. Make sure the water goes the long way round through the rads (open just one at a time) and not the short cut straight to the drain!