I have no idea why cold water makes a rodi slower but it does for all of them.
I've heard that a way to combat this problem is to have anextra length if intake tubing coiled up inside a bucket of water with a heater in it. As the water travels through the tubing it gets warmed by the warmed water that its sitting in. This raises the water temp without actually filtering hot water.
Paul, for your situation, I'd highly recommend getting a pressure gauge.
I've heard that a way to combat this problem is to have anextra length if intake tubing coiled up inside a bucket of water with a heater in it. As the water travels through the tubing it gets warmed by the warmed water that its sitting in. This raises the water temp without actually filtering hot water.
Paul, for your situation, I'd highly recommend getting a pressure gauge.