Apologises as I'm sure this question is old hat but if you could help me from cocking things up and save me a few bob I would appreciate it. My hot and cold supplies are both low pressure and me being a complete muppet installed high pressure fittings to the WHB and shower. Okay, so it works reasonably well but it needs a kick up the backside to get anything like a decent flow. The H&C supplies are a mile apart which doesn't help but I would be happy to install a pump to assist the hot water only. The thing that's concerning me is circulation through the vent. Apart from adjusting the pump speed is there any thing I should consider before I balls things up again.