I’m installing an electric tank water heater (Rheem Marathon) in a conditioned space. The hot pipe will be insulated all the way.
But how many feet of the cold (supply) line should I insulate? The pipe for it goes up 6in, sideways 8in, then down 6 ft through a floor.
CA requires insulating the first 5’ (p. 25 here), but couldn’t find anything in IPC. I’m looking for best practices more than a code citation though. I’m guessing the need for this has to do with insulating the part of the pipe that may become heated by thermosiphoning… and with my pipe route, that’d probably only be a couple feet, right? Let me know what you think, and thanks!