Grim Reaper
Active Member
I live in a 10 story condominium which has serious plumbling problems due to the lining of the hot water plumbing with epoxy 10 years ago to fix and prevent pinhole leaks in the 1/2 inch copper hot water plumbing pipe risers. The epoxy has deteriorated and is breaking off and plugging the plumbing, valves, taps, fixtures, appliances, etc. The plumbers are replacing sections, sometimes the whole length of the 1/2 inch hot water risers with 3/4 inch. When this plumbing replacement first began, I raised the issue about decreased water pressure because the water pump(s) is/are not sized for 3/4 inch risers. Sure enough, the hot water pressure is lower now than it was before. Should the pump(s) be changed to more powerful ones to increase the water pressure back to what it was before? If that is the lower water pressure remedy, how should the pump capacity be calculated, and, if that isn't enough what else should be done?