Correct installation of hot water electric geyser Plumbing piping: The geyser may be fed with polycop (plastic) pipe – up to the shut-off valve, but the pipe into and out of the geyser must be copper or galvanised steel. The PCV and T&P vent pipes also have to be steel or copper, especially the T&P vent. Geyser plumbing diagrams | MyBroadband Forum The pipe that extends out of the roof is the pressure relief or overflow pipe. In the event that the geyser gets too hot, or there is a restriction in the piping this valve will open allowing the Geyser Wiring Diagram | Diagram Geyser Piping Diagram Wiring Diagrams Schematics. Two. Geyser Wiring Diagram Banksbanking Info. Water Heater Wiring Schematic Electric. Whirlpool Energy Smart Electric Water Heater. 11 Best Arduino Starter Kits For Beginners Water Geyser Circuits. New Hot Water Heater Wiring Diagram. Water Heater Piping Connections & Installation Guide to water heater or geyser installation: Water heater piping installation & connections: here we describe the plumbing connections and piping options for hot water system hook-ups. We explain the piping for a basic water heater installation compared with options for connecting hot water heaters in parallel, in series, or ganged.