plumbing in basin mixer tap

[chris3085uk]

i have recently tried to install a new basin and mixer tap in my bedroom, i have placed isolater valves on the hot/cold pipes and used flexi-pipes from the valves to the mixer tap but the problem is the hot tap has a very poor flow but the cold tap is fine with no issues, the water flow coming out of the isolator valve is no problem and the same with just the flexi-pipe but as soon as i connect it to the mixer tap the water flow just slows right down (on the hot). any advice???

 

[seco services]

Is your hot gravity fed and your cold mains fed ?

 

[chris3085uk]

Both pipes are coming from the lift area, so I think they are both gravity, but to be honest not too sure.

 

[chris3085uk]

*loft

 

[seco services]

Sounds like you have gravity hot mains cold.
Shut your main stopcock see if the cold stops, if it does your on mains cold.

Your mixer is more likely for mains pressure not low pressure ie gravity fed.
You'll need a low pressure mixer tap.

 

[Dan Robinson]

Sounds to me like you are twisting the hose when you tighten it onto the tap.

 

[chris3085uk]

Thanks for the replies, yes when I turn the stopcock off the cold does go off, I think I will probably have to change the tap, the flexi-pipe needs to be turned/twisted to get it onto the mixer tap, unless there's another way?

 

[chris3085uk]

I'm just looking at new taps whats the best low pressure type, I.e 0.2 or 0.5 etc?

 

[seco services]

The lower the number the better flow you'll have. ie 0.1 is better than 0.2 on gravity.

Screw the flexis in the base of mixer, fit mixer then join to iso valves then you won't twist and damage the flexi hose.