Shower Pump

[rabch23]

Hi all,

I have a gravity fed hot from the tank in my loft for my Hot water and high pressure mains feed for my cold. My question in if I was to get a shower pump for boost my hot water when using my shower, should u buy a single feed pump or can I get the normal double but just not connect the cold. I can get my hands on the double for cheep money but want to if its a wast of time.

Thanks for all your help :-)