Xirtec CPVC is a system of dimensionally matched pipe, fittings and valves that are certified for use in noncombustible construction, high buildings and air-return plenums.
Some hydronic system designers cling to certain system piping configurations — even when existing projects using those configurations have produced problems.
When troubleshooting a hydronic system, the piping layout is often confusing. To understand the system, I sometimes sketch the piping to help me visualize the flow of water.