Tankless Repair · Rinnai · Navien · Noritz · Takagi

Tankless Water Heater Repair in San Francisco

Error code on the display, water that goes cold mid-shower, or a unit that won’t ignite? Tankless heaters are reliable, but they need the right technician. We diagnose and repair all major brands — and we descale them, which solves more tankless problems than any other single fix.

Licensed & Insured

Fully licensed, bonded and insured. Every plumber is background-checked and drug-tested.

24/7 Emergency Service

Burst pipe at 2am? We answer the phone and we show up — typically within 45 minutes.

40+ Years Experience

Family-owned and serving the Bay Area since 1985. We've seen it all and fixed it all.

Upfront Pricing

Free estimates, no hidden fees, no upcharges. And we'll beat any written bid*.

Common tankless symptoms

An error code on the unit's display
Water temperature swings hot and cold (the 'cold water sandwich')
Reduced hot water flow or pressure
The unit won't ignite, or ignites and shuts off
A burning smell or unusual noise from the unit
It's been more than a year since the last descaling

Most tankless problems are scale

Hard water is a tankless heater's worst enemy.

Bay Area water carries minerals that build up inside the heat exchanger. As scale accumulates, the unit works harder, flow drops, temperatures swing and eventually error codes appear. Annual descaling prevents most of it and restores performance when it’s already happened.

Beyond scale, we repair igniters, flame sensors, flow sensors, gas valves, venting issues and control boards — with the diagnostic tools each manufacturer requires.

How it works

Tankless Water Heater Repair, step by step

No surprises: you know what’s wrong, what it costs and what we’re doing before we start.

Read the codes

Every brand’s error codes point to a system; we start with the diagnostic history the unit already stores.

Test the system

Gas pressure, water flow, venting, ignition and sensors are checked against the manufacturer’s specs.

Repair or descale

Most visits end with a descaling and a replaced sensor or igniter; we quote anything larger before we do it.

Verify performance

We confirm flow rate and temperature stability at your fixtures before we leave.

Your options

Tankless services

We recommend the least invasive fix that will actually last — and we explain why.

Descaling & Flush

Circulated descaling solution removes mineral buildup from the heat exchanger and restores flow and temperature.

Ignition & Sensors

Igniters, flame rods, flow and temperature sensors replaced for the most common error codes.

Control Boards & Gas Valves

Component-level repairs on units worth saving, quoted honestly against replacement.

Venting & Combustion Air

Vent and intake problems that cause shutdowns and safety lockouts corrected to code.

Need Tankless Water Heater Repair today? We're 45 minutes away.

24/7 emergency service across San Francisco and the north Peninsula. Free camera-verified quotes, upfront pricing, and we’ll beat any written bid*.

Why Economy Plumbing

Why homeowners call us for tankless water heater repair

Brand-trained

We service Rinnai, Navien, Noritz, Takagi, Rheem and Bosch with the manufacturer's diagnostic procedures.

Annual maintenance

Put your unit on a yearly descaling schedule and you'll rarely need us for anything else.

Repair vs. replace, honestly

A 15-year-old unit with a failed heat exchanger isn't worth repairing; a 6-year-old one with a bad sensor is. We'll tell you which you have.

FAQ

Tankless Water Heater Repair questions, answered

What does the error code on my tankless heater mean?

Codes vary by brand, but most point to ignition, flow, venting or temperature faults. Tell us the brand and code when you call and we’ll usually know what to bring.

How often should a tankless heater be descaled?

Annually in the Bay Area. Units in hard-water areas or with heavy use may need it twice a year.

Why does my shower go hot and cold?

Usually scale reducing flow through the heat exchanger, or a failing flow sensor. Both are repairable in one visit.

Can you repair my brand?

Yes — Rinnai, Navien, Noritz, Takagi, Rheem, Bosch and others.

Is it worth repairing an older tankless unit?

Tankless units last 15–20 years with maintenance. If the heat exchanger is sound, a repair is almost always worth it. If it’s failed on an older unit, replacement is the better money.

5-Star Reviews

Don't Just Take Our Word For It

Here’s what Bay Area homeowners and businesses say about working with Economy Plumbing.

Chris was prompt, friendly, helpful, and cleaned up after himself. He did a fine job on the repairs and I was still smiling after I wrote the check. Pretty rare for me! I had called a number of places on Yelp and Economy Plumbing was the first to get back to me. Kudos all around!

H.G.Verified Customer

I called in for a Kitchen Clog and I wanted to get this issue FIXED ASAP so I can watch my Giants! I spoke with the representative there. I believe her name was Michelle. She was really nice, and helpful and was able to get someone out to my office in less than an hour. When the technician came — Albert was so prompt and really accommodating. Since I work in the servicing industry, I appreciated the fact that he was courteous and willing to explain things to me. I have no experience in plumbing so he was able give me some pointers to prevent this issue from happening again in the future. I definitely recommend Economy plumbing!

Aaron G.Verified Customer

Joe came out at 10pm for an urgent dishwasher leak, I had airbnb’d my unit and a quick response was crucial. He’s very polite and friendly and got the job done right. I called one other place and they told me they could do it tomorrow and after I told them I needed somebody tonight they said they would charge me an “emergency” fee just for coming out since it was late. Economy plumbing was the first one listed on google’s preferred vendors and rightfully so thanks to Joe!

Omid K.Verified Customer

Highest ratings to Economy plumbing. Spencer was exacting, proactive, factual and comforting. He and Emanual took care with every aspect on assessing multiple issues causing drain backup and leakage in my kitchen and bath. They worked efficiently to get everything repaired including replacement of my entire kitchen sink pipes that were busted and the main drain to the basement: It wasn’t cheap, But after comparing it to the estimated of 2 other companies -it was very fair. I’m super happy with the work and their professionalism. Would definitely use again- these guys are my new plumbers!

Finny BVerified Customer

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Free Estimates

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