Expert Tankless Water Heater Repair in Sunnyvale, CA
Jet Pipe Plumbing provides tankless water heater repair in Sunnyvale, CA for error codes, scaling, and ignition issues, serving Campbell, Santa Clara, and the South Bay.
Experienced & Certified Team
Same-Day Service
Clean & Tidy Work
400+ Five-Star Reviews
Jet Pipe Plumbing provides tankless water heater repair in Sunnyvale, CA, serving homeowners throughout Campbell, Santa Clara, and the South Bay. Tankless units fail differently than a standard tank, and our licensed technicians are experienced diagnosing the specific error codes and components Navien, Rinnai, Noritz, and Rheem units rely on.
Common Tankless Repair Issues
The most common tankless repairs we handle include error codes displayed on the unit’s control panel, reduced hot water flow or temperature fluctuation, scaling buildup on the heat exchanger, ignition failures, and venting or air supply issues that trigger a safety shutoff.
Same-Day Repair Service
Call before 2 PM and we can arrive the same day.
Free Diagnostic
We read error codes, inspect the unit, and explain what failed before any work begins.
All Major Gas Tankless Brands
Navien, Rinnai, Noritz, Rheem, A.O. Smith, and others.
Flat-Rate Pricing
You approve the price before we start. No surprises on the invoice.
1-Year Labor Warranty
Every repair is backed by our workmanship guarantee.
Manufacturer Warranty Preserved
We document repairs properly so your manufacturer warranty stays intact.
Reading Error Codes
Tankless units display specific error codes when something goes wrong, which helps narrow down the issue before a technician even arrives. We’re familiar with the common codes across Navien, Rinnai, Noritz, and Rheem systems and use them as a starting point for diagnosis, not the final word.
Symptom / Error
Likely Cause
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Scaling and Hard Water Damage
Hard water is one of the leading causes of tankless performance issues in the South Bay, since mineral scale builds up inside the heat exchanger over time. Regular tankless maintenance and descaling helps prevent the kind of scaling that eventually requires a repair call.
Free Diagnostic Before Any Repair
Every repair call starts with a free diagnostic, so you know what’s actually wrong with your tankless unit and what the repair will cost before we begin any work.
Certified & Licensed Technicians
CA Plumbing License #1139033. No subcontractors — just experts.
Same-Day Availability
Call us before 2 PM and get same-day water heater service.
Transparent, Flat-Rate Pricing
No hidden fees. No upselling. Know the cost upfront.
Clean, Respectful Service
Shoe covers, clean workspaces, and full cleanup after the job.
Free Diagnostic with Any Service
We’ll inspect your system and explain your options — free of charge.
Over 200 5-Star Reviews
Real homeowners. Real results. See what others are saying!
Ignition and Gas Supply Issues
A tankless unit that won’t ignite or that shuts off unexpectedly may point to a gas supply, venting, or ignition component issue. Our licensed technicians test each of these systematically rather than guessing at a fix.
Repair vs. Replacement for Tankless Units
Tankless units generally last longer than a standard tank, but a unit with repeated scaling damage or an aging heat exchanger may reach a point where installing a new tankless unit makes more sense than continuing to repair the old one. We’ll give you an honest recommendation either way.
Flat-Rate Repair Pricing
Every tankless repair includes a flat-rate quote agreed before work begins, backed by a workmanship warranty on the repair itself.
Locally owned & operated
Focused on quality & relationships
Always clear, honest communication
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Licensed South Bay plumbers.
Honest pricing, no surprises.
Preventing Repeat Repairs
If a tankless unit keeps triggering the same error code or needing the same fix every few months, that’s usually a sign of an underlying issue rather than bad luck. Recurring scaling problems, a gas supply that’s marginally undersized, or venting that doesn’t meet the manufacturer’s spec can all cause a repair to hold for a while and then fail again. When we see a pattern like this, we look past the immediate symptom to the root cause, and we’ll tell you plainly if a component needs replacing, if the installation itself needs adjusting, or if switching to a more frequent maintenance schedule would prevent the issue from coming back rather than just treating it repair after repair.
1-Year Workmanship Warranty
C-36 Licensed & Insured
In-House Certified Plumbers Only
Satisfaction Guarantee
Fast Callback Response
Free On-Site Diagnostic
What Our Customers Say
Service Areas
Serving the Entire South Bay Area
We proudly serve homeowners in:
Serving Sunnyvale and the South Bay
We repair tankless water heaters throughout Sunnyvale and nearby Campbell, Santa Clara, San Jose, and Cupertino. Contact us for a free diagnostic, or ask about tankless maintenance to help prevent future issues.
GALLERY
Recent Water Heater Projects
Take a look at some of our recent installs across the Bay Area
CONTACTS
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Frequently Asked Questions
Do you repair electric tankless water heaters?
No. We repair gas tankless units only.
Which brands can you repair?
We repair Navien, Rinnai, Noritz, Rheem, A.O. Smith, and other gas tankless brands. We carry common parts for Navien, Rinnai, and Noritz — most repairs are completed in one visit.
Can you read and diagnose error codes?
Yes. We diagnose error codes for all major gas tankless brands on-site. The code tells us where to start — the diagnosis tells us what actually failed.
My unit is under manufacturer warranty — can you still repair it?
We can diagnose the issue. For units under manufacturer warranty, repairs may need to go through the manufacturer’s service network to preserve coverage. We will advise you on the best path when we assess the unit.
Is the repair guaranteed?
Yes. All labor is covered by our 1-year workmanship warranty.
What if the heat exchanger failed?
Heat exchanger failure is the most expensive tankless repair. Depending on unit age and warranty status, replacement may be more cost-effective. We give you both options with pricing before you decide.