I am installing an EcoSmart 18 tankless water heater. I have experience with plumbing cpvc and wiring, and am also a mechanic. I already have to replace my outdoor service panel because it doesn't have enough room for the two double-pole 40 amp breakers required, and don't want any more problems.
I have purchased a BrassCraft 3/4" IPS service valve kit complete with a pressure-relief valve, and am wondering if I need to use flexible braided hose from these valves to the 3/4" CPVC, or can I connect the CPVC directly to the service valves? I am inclined to think the hoses will be needed because of heat.
The only other question I have is if a water purifier, like an Aqua Pure AP430SS, is needed. We are on city water.
We haved a tankless unit (gas, not electric). Installed it myself when we built the house. The CPVC lines are connected directly to the service valves. Been that way for seven years now with nary a problem.
Whether or not you're on city water is irrelevant. What matters is the quality of the water (some city water around here is very hard). So is my well water, which is why I have a Culligan softener. You should have your water tested. If it's hard, you'll definitely need some sort of treatment system or your expensive tankless won't last very long. Plus, you'll be flushing and descaling it often.