Constant trickle of hot water into F&E tank

[Neddy1984]

Hi guys,
there's a continuous trickle of hot water into the F&E tank in the loft which is worrying me. There's a 15-60 pump on the system which when turned down to speed 1 still only slightly affects the trickle of hot water. would fitting a 15-50 pump help to stop this? Obviously the vent pipe is higher than the cold feed and the continuous trickle suggests this is more than just expansion within the system, the pump is actually over pumping. Any suggestions would be greatly appreciated.............

 

[Neddy1984]

If the mi's ask for 22mm then that's what you'll need. I've only ever combined the f&e in 22mm, water expands quite rapidly when it reaches boiling point 🙂

Can you seal the system? That way you do away with all the pumping over.

by fitting an expansion vessel?

 

[fuzzy]

by fitting an expansion vessel?

bit more too it than that, easier to sort this issue out first

 

[Neddy1984]

thanks guys, been a lot of useful info here

 

[diamondgas]

by fitting an expansion vessel?

Yes, expansion vessel and pressure relief plus a means of filling... p16 fig 3.10 if I have the correct mi's ... you will be subjecting the system to greater pressure.... In theory you could use the header tank as the make-up if you fit an apropriate none return valve and do away with the open vent pipe 🙂