Mains cold feed & positive feed hot

[Cuore155]

Hi,
Just installed a mixer shower which works with all hot water systems. Have installed a regulator valve on cold input into mixer to reduce flow, however hot water pressure is too low, so mains cold pressure over powers hot feed, so just a warm drizzle!!! Am looking at installing a 1.8bar single outlet pump for hot water. Would I need to put some inline regulator on the cold feed to balance the feed and bring the cold pressure down a bit, or will the pump be sufficient to boost pressure and solve the problem.
Any advice gratefully received.
Stewart

 

[sambotc]

presuming you have a cylinder fed hot water supply with mains cold?

The easiest + cheapest option would be to have a tank fed cold supplying the shower, which will balance out the pressure issues.

 

[chrishutt]

You can try what you suggest, but the pump will need its own dedicated supply from a special tapping on the hot water cylinder. You can't just plumb it into the existing hot supply to the shower.

An alternative would be to use a Venturi shower valve which uses the pressure of the mains cold water to boost the hot water flow. The brands currently available are Treviboost and New Team Jetstream.