hi. I need to increase the hot water pressure on my vented gravity fed system. All the cold taps, including my bath mixer taps are fed from the mains (not the header tank). If I put a 3bar pump (with a Surrey flange) on my hot water side could I have issues on my mixer taps? I have been told pressurising only the hot water could force hot water in the cold pipe on my mixer taps. Thanks for any advice. Ps, has anyone used the Salamander CT Force pump range?