DIY Doctor UK DIY Forums

Hi     I have two problems with my central heating system.1. water seems to be running into the expansion tank from the vent pipe.    I think this is when the system is on "hot water" only?2. The on/off tap on the cold feed to the expansion tank was left closed     at some point and I noticed this when the system became noisy.    However this alerted me to the fact that the header tank seems to    need topping-up on a regular basis is this normal?    and should I now just leave the feed tap on and forget about it?Thanks

The tank should be fed via a ballvalve therefore there should be a constant cold supply and any isolation valves should be left open, the tank will refill itself when the water level drops.

https://www.diydoctor.org.uk/forums/view ... hp?t=12601


htg

[quote="htg engineer"]The tank should be fed via a ballvalve therefore there should be a constant cold supply and any isolation valves should be left open, the tank will refill itself when the water level drops.

https://www.diydoctor.org.uk/forums/view ... hp?t=12601


htg[/quote]


Thanks htg engineer!

I will now leave the feed tap open.

One last point however!
The system seems to lose a small amount of water on an ongoing basis.
Is this normal?

Thanks