In hot water Page 2
I was advised by the Whale engineers to install a non-return valve directly downstream of the water tank. Sometimes water can leak back from a pump via a poorly sealed connection or failed seal, and, by maintaining pressure in the hose, the check valve prevents the pump from continually cycling on and off. They also suggested I run a separate cold-water line to the manual pumps in the head and galley, teed off upstream of the electric pump. This prevents the electric pump from forcing water through the manual pumps.