Power Flushing

[topman]

Can I power flush my central heating system using mains water via hose. If so what is the best way.

 

[breezer]

no, best you could do is "rinse it"

 

[PEDANTICVINDICTIVEMAN]

Put in some Sentinel X400 for a week, then cap off vent and feed pipes, then connect mains onto pump inlet and hose to drain from pump outlet, close all radiators except one, flush each rad at a time by closing rads on and off individually, when done reverse connections and start again, uncap vent and feeds, refill adding sentinel X100, works for me every time.

 

[DP]

After such a flush is carried out, I suggest a water sample be taken from top of rad. You will be surprised to see cleansing chemicals in full strength in the sample while drainoff is crystal clear.

 

[Malc]

Back in my days at school in chemistry the rule was rinse 3 times. Based on that you'd want to drain (open bleed valves too), refill, bleed and circulate, 3 times to be sure it was all out. All valves open when circulating of course, or perhaps better still just one on at a time to make sure the water is pushed through each rad.

BTW. I found when draining my system for cleaning that the feed was faster than the drain so I could have the drain open and the pump on. That should have shifted a lot (still need to drain and refill to be sure thought).