Water Heater Repair in San Jose, CA
Cold shower surprise? We respond fast to restore hot water for your family — tank and tankless systems.
Water Heater Repair in San Jose & the Bay Area
No hot water is a today problem, not a next-week problem. Promax repairs tank and tankless water heaters throughout San Jose — relighting and replacing pilot assemblies, swapping heating elements and thermostats, fixing gas valves, descaling tankless heat exchangers, and stopping leaks at fittings and valves before they become floor damage.
As Navien Service Specialists we're factory-trained on the tankless systems most plumbers struggle with, and we service Rheem, Bradford White, A.O. Smith, Rinnai, Noritz, and every other common brand. If the unit is too far gone, you'll get a straight answer and a same-visit replacement quote — often with next-day installation.
Water Heater Repair, Done Right
Every water heater repair visit is built around three things: finding the real cause, fixing it with parts already on the truck, and getting a licensed technician to your door fast. Same-day service for no-cool, no-heat and no-hot-water calls, 7 days a week. Diagnostic fee waived with any repair.
- Fully stocked trucks carry parts for most repairs on the first visit
- We repair Rheem, Bradford White, A.O. Smith and every other major brand
- Licensed, EPA-certified technicians on every call
- We stand behind our work — service and spare parts are both covered
What's Included With Water Heater Repair
Every water heater repair visit covers the items below, and the scope and price are confirmed in writing before any work starts. When it's finished the technician walks you through what was done and what to watch for. We call back within one business hour, 7 AM – 10 PM.
- Diagnosis of tank, tankless, and heat pump water heaters
- Pilot, thermocouple, heating element, and thermostat repairs
- Tankless descaling and error-code troubleshooting
- Leak repair at fittings and valves before it becomes water damage
- Same-day service for no-hot-water calls, 7 days a week
Signs You Need Water Heater Repair
Each symptom below means a part is wearing out or already failing, and these problems rarely fix themselves. Waiting usually lets a small fault damage other components, which turns a modest repair into a larger one and raises the odds of a breakdown at the worst possible time. Call (669) 777-1997 or book online, and a technician will pinpoint the cause.
- No hot water, or it runs out much faster than it used to
- Lukewarm water no matter how you adjust the setting
- Popping, rumbling, or banging sounds from the tank
- Water pooling around the base of the unit
- A tankless unit displaying an error code
Brands We Repair
Promax is a Navien Service Specialist, so Navien equipment is repaired by technicians with factory-backed training. We repair every other major brand as well, whatever name is on your equipment. Our fully stocked trucks carry common parts for these brands, so most repairs are finished in a single visit.
Need water heater repair help in San Jose?
Related Services
Most water heater repair jobs touch one of these, and the same licensed Promax team handles all of them. Each page lists what's included, typical costs and the questions San Jose homeowners ask most. Not sure which you need? Call (669) 777-1997 and we'll point you to the right one.
Where We Work
Promax Service Group serves homes and businesses in San Jose, across Santa Clara County, and in nearby Peninsula and East Bay cities. Same-day service for no-cool, no-heat and no-hot-water calls, 7 days a week. Choose your city for local details, or call (669) 777-1997 to confirm we cover your address.
Frequently Asked Questions
Why is my water heater not producing hot water?
Gas tanks: usually a failed thermocouple, pilot, or gas control valve. Electric tanks: a tripped high-limit switch or burned-out element. Tankless: scale buildup or an ignition/flow-sensor fault showing an error code. Tell us the symptoms and model and we'll arrive with likely parts on the truck.
Is a leaking water heater repairable?
Leaks from valves and fittings — yes, usually inexpensive. Leaks from the tank body itself — no; the internal liner has failed and replacement is the only safe fix. We'll tell you which one you have within minutes of arriving.
My tankless water heater shows an error code — what does it mean?
Error codes usually point to scale buildup, gas supply, venting, or sensor faults. Navien, Rinnai, and Noritz each use different codes — snap a photo of the display when you call and our dispatcher can often quote the likely fix before we roll a truck.
Should I repair or replace my water heater?
If the tank itself is leaking (not just a fitting) or it's past 10–12 years old, replacement is almost always the right call — the internal liner has failed and can't be repaired. Element, thermostat, valve, and most tankless component failures are usually worth repairing on a unit under 8–10 years old.
How fast can you fix a no-hot-water emergency?
We offer same-day service for no-hot-water calls, 7 days a week — call in the morning and we'll typically have a technician out that day with common parts already on the truck.