Efficient Water Heaters, Inc.

San Jose Water Heater Specialist

Water Heater Repair in San Jose, CA

Same-day diagnostics for leaks, no hot water, pilot and burner issues, thermostat failures, and tankless error codes — gas, electric, tank and tankless.

Call (408) 470-0191 for Same-Day Repair Get Phone Estimate
  • Licensed CSLB #1008381
  • Navien Service Specialist
  • Rinnai PRO
  • Noritz Certified
  • Same-Day Service
  • Gas, Electric & Tankless
Licensed San Jose water heater technician on a repair call

What this service covers

Most San Jose water-heater calls fall into a small set of failure modes. We diagnose by symptom, age, model number and install location — so we don't waste your time on guesswork.

  • No hot water or lukewarm water only
  • Water pooling under or beside the tank
  • Pilot light won't stay lit
  • Burner won't ignite or shuts down mid-cycle
  • Cold-water sandwich on tankless units
  • Popping, rumbling or sediment noise from the tank
  • Discolored or rusty hot water
  • Tankless error codes (Navien E110/E003/E012, Rinnai, Noritz)

Many tankless calls trace back to missed descaling — we cover that during the visit when it's the root cause.

How a San Jose Water Heater Repair Visit Works

1

Diagnose the symptom

We start with the issue: no hot water, leak location, error code, pilot failure, rumbling noise, or inconsistent temperature.

2

Check the unit and installation

We review the model number, age, venting, top connections, gas or electrical setup, expansion tank, and install location.

3

Give a clear repair path

If repair is safe and cost-effective, we explain the likely part, labor, and timing before work begins.

4

Repair, test, and document

After the repair, we test operation, check for safe performance, and explain what to watch for next.

What we do on the job

We do not guess. We check the model, symptom, installation, and safety requirements before recommending a repair.

  • On-site diagnosis with model-number lookup
  • Thermocouple, igniter, flame sensor replacement
  • Gas valve and control-board testing
  • Tankless flow sensor and ignition repair
  • Descaling for mineral buildup
  • T&P valve and expansion tank replacement
  • Anode rod inspection on tank units
  • Venting and combustion-air verification
Repair Review
“We texted EWH at 10pm and they called us right away! Our 10-year-old tankless water heater wasn't heating, and Marcus came out first thing the next morning. He had to order parts which came in the next day. He was back quickly to replace them and had our heater back to working. We are very impressed with this company — they are definitely very efficient and friendly too.”
Janet B. — San Jose, CA

San Jose Repair Factors We Check

San Jose water is moderately hard. On tankless units in particular, mineral scale is the single biggest cause of premature failure — restricting flow, triggering ignition errors and starving heat exchangers. On tank units in older homes across Willow Glen, Cambrian, Rose Garden, Almaden, Berryessa and Evergreen, we frequently see undersized expansion tanks, missing seismic strapping and outdated venting.

  • Hard water and mineral scale
  • Garage and closet install locations
  • Expansion tank issues
  • Seismic strapping
  • Venting and combustion air
  • Tankless descaling history
  • Older San Jose housing stock

We also serve Santa Clara, Sunnyvale, Cupertino, Mountain View, Campbell, Los Gatos, Saratoga, Milpitas, and the wider South Bay.

Repair vs Replacement: A Fast Framework

Use this matrix. If most rows point to "replace", call for a replacement estimate instead of paying for repairs.

Age

Repair: Under 8 years

Replace: 12+ years

Leak location

Repair: Fittings, T&P valve, or accessible connection

Replace: Tank shell leak

Repair frequency

Repair: First minor repair

Replace: Second major repair within 12 months

Efficiency

Repair: Unit is standard but serviceable

Replace: Unit is near end of life or inefficient

2027 BAAQMD planning

Repair: Minor repair and unit is otherwise stable

Replace: Already replacing in 2026 or later; plan for Bay Area zero-NOx rule

If you're already replacing in 2026 or later, talk to us about what the Bay Area's January 1, 2027 zero-NOx rule, BAAQMD Rule 9-6, may require.

Not sure which side your water heater falls on?

Call (408) 470-0191Get Phone Estimate

Brands We Repair and Service

Efficient Water Heaters repairs and services Navien, Rinnai, Noritz, Bradford White, A.O. Smith, Rheem and RUUD. We diagnose by model number, install location, venting, gas/electrical configuration, and service history. If repair is not cost-effective, we can also explain replacement options.

Related guides & services

Frequently asked questions

Repair pricing depends on the part, the brand and the install location. Common repairs like a thermocouple, igniter, flame sensor or thermostat are modest; full control-board or heat-exchanger work on tankless units is significantly more. We give phone estimates so you know the range before we roll a truck.

No Hot Water or a Leaking Tank? Call Now.

Call or request a phone estimate. A San Jose water-heater specialist will review your situation and help you decide whether repair, replacement, tankless, or heat-pump service makes sense.

Call (408) 470-0191 Get Phone Estimate
  • Licensed CSLB #1008381
  • Bonded & Insured
  • Open 24/7

Navien Service Specialist · Rinnai PRO · Noritz Certified