Cold Gravity

[flipit]

Hi,

I have a combi fitted in my flat which supplies the hot water to the shower mixer, however the cold is on a gravity feed from the old gravity heating system. Since I'm on the top floor and the header tank is just a few feet above, I don't get much pressure on the cold. (Thought it may have been residual pressure from the hot flowing back up the cold, so I fitted a no-return value to the cold but it's not much of an improvement.) Can I fit a single pump to the gravity cold pipe to improve the pressure to the shower? I read that you can't use pumps with combi's but this isn't strictly on the same system as the combi.

Thanks

 

[doitall]

yes you could put a pump on the tank cold provided the pressures are equalised and a non return valve was also fitted to the shower hot, although the better quality showers have them built in.