shower pump

[doblo7]

Hi,
Am i right in buying a twin impeller pump but just connecting the hot supply only as this is the one that has poor pressure to my gravity fed shower. do i have to cap the cold inlet and out let, or just leave them disconnected? I also dont understand why single impeller pumps cost more than twin ones? Many thanks for all replies.

 

[Fluffster]

Twin impeller pumps must be attached to hot and cold feeds to operate, if you cap one side off the unit will beome defective.
You need to go for the single impeller pump last one I bought was about £150 inc vat.
Pete

 

[doblo7]

many thanks for your reply, you've saved me an expensive mistake!