drain points

[crompton]

There are two white drain taps outside my house for the CH. Why two? What's the diff between one and the other? Can I use these to refill the system when I'm done cleaning it out?

ta

 

[dextrous]

One's for the flow pipe and the other for the return pipe. Quite handy - you can use this to flush fresh water through the system without having to undo anything indoors.

Yes, you can use this to refill the system up to a point. If it's a conventional system then make sure you don't overfill the expansion tanks, and if a pressurised system, use the filling loop to get the final pressure just right.

Remember you'll need to add inhibitor, so it's best to isolate one radiator completely before refilling - you can use this to add the chemical to.

 

[crompton]

when I open both the drain points water flows out of both, so hard to know which is which. Flow is better, steadier from the RH point so I was planning to flush and fill through that one. Any suggestions?

ta

 

[neds]

What kind of system have you got? sealed or open vented. If the former just use the filing loop and put the inhibitor in one of your rads upstairs. if the latter you can fill most through a hose from either your Flow or Return then tip the inhibitor into your F&E tank.