Trying to keep a 50‑gal HPWH swap under 3 hours — anyone else pre-stage unions and a 3/4 in condensate trap to speed it up? I set mixed outlet to 125 F, add a 5‑micron sediment filter ahead of the unit, and only add an expansion tank when static pressure is over 65 psi; curious what you’re seeing for callbacks or what you’d tweak.
I keep it under 3 hrs by dropping in a prebuilt valve block — 3/4 full‑port iso valves with a center drain and union stubs — so I can pressurize and flush before the tank touches the pad. > an expansion tank when static pressure is over 65 psi; curious what you’re seeing for callbacks I’ve had fewer nuisance T&P weeps setting the threshold at 60 psi and pre‑charging the tank to street pressure — are you seeing any issues at 125 F with recirc?
Piggybacking on @sarah62, I use press adapters on the tank nipples and a pre-cut copper U so I can set and test both lines in one go; usually shaves 20–30 minutes on a 50‑gal. I’d still add an expansion tank whenever there’s a PRV/backflow, not only when static is over 65 psi, since that’s where I see T&P weeps — do you see traps drying out, and if so are you adding a cleanout tee to prime fast?
Fastest gain for me is forced-draining the old tank with a small transfer pump and cracking the hot side — saves 15–20 minutes vs waiting on a lazy drain. I add a condensate tee and cleanout ahead of the 3/4 trap so I can blast slime without tearing anything apart, which killed most callbacks. I leave the mix at “125 F” but tighten the lock ring and tag it; too many “water’s cooler” calls when folks bump it — are you using a lockable head on your mixer, @ella4657?
While the old tank’s draining, I pre-hang the seismic straps with a quick cardboard template so the HPWH drops in and straps snap on — saves a few minutes and fewer wall scuffs. I also prefab the condensate with a unioned trap and a capped tee so I can “prime the trap” at startup and clear crud later; cut my nuisance float trips a lot — are you seeing any condensate callbacks?
I set it to “Hybrid” for the first day so they’ve got hot water fast, then switch back to HP-only — cuts day‑one “no hot water” calls. I’d trade the 5‑micron cartridge for a flushable wye strainer with a boiler drain so you can purge grit without the flow hit. If there’s a PRV on the line I add the expansion tank no matter what; still under 3 hours.