Navien Tankless Flush & Descaling Service in San Jose

Signs your Navien is overdue for a flush

Scale rarely announces itself. It shows up as small annoyances first, then as an error code on a cold morning.

• Flow rate has dropped — the shower can't keep up like it used to
• Temperature swings mid-shower, or the burner cycles on and off
• A rumbling or kettling sound while the unit fires
• E016, E030, or E110 overheat and exhaust-temperature faults
• The unit takes longer than it used to before hot water arrives
• It's been more than a year — or you've never had it done

What our descaling service includes

A real flush is more than pumping vinegar for ten minutes. Here's the full scope.

• Isolate the unit at the service valves and connect a circulation pump and hoses
• Circulate descaling solution through the heat exchanger for 45–60 minutes
• Remove and clean the cold-water inlet filter screen
• Rinse thoroughly and verify flow rate against the unit's rating
• Inspect burner, flame rod, igniter, condensate trap, and venting
• Check the stored fault history and combustion performance, then log the service

No isolation valves? We add them

Plenty of San Jose tankless units were installed without service valves, which makes flushing impossible without cutting pipe. We install a proper isolation valve kit — and, where it makes sense, a scale-reduction filter — so every future flush is quick and inexpensive.

DIY flush vs. professional descaling

A homeowner with a pump, hoses, and valves can circulate vinegar and get some benefit. What a DIY flush doesn't do is clean the inlet screen properly, verify flow against spec, read the fault history, inspect the flame rod and condensate trap, or check combustion. Those are the steps that catch a problem while it's still a $0 conversation instead of a failed heat exchanger.