Water Heater Repair in San Francisco, Palo Alto & San Mateo
JK Plumbing repairs, replaces, and flushes tank, tankless, and commercial water heaters across San Francisco, Palo Alto, San Mateo, and the SF Peninsula. Same-day service on most jobs, every major brand serviced, written quotes before any work starts. Licensed master plumbers since 2007. CA License #1080266.
By Alik, Owner & Master Plumber · Last updated June 2026
Rated 5 stars on Google · 19+ Years in Business
A licensed plumber answers, not a call center.
Signs You Need Water Heater Repair
Most water heater calls start with one of these symptoms. Two or more at once usually means the unit is at end-of-life and replacement is cheaper than repair:
- Water heater not warm enough. Lukewarm water that used to be hot — usually a failing heating element (electric), pilot/thermocouple issue (gas), or a thermostat that’s drifted.
- Hot water runs out mid-shower. Sediment buildup in the tank is reducing usable capacity. Often fixable with a flush; sometimes the dip tube has broken.
- Popping, rumbling, or banging sounds. That’s calcium deposits cooking against the tank wall. Untreated, the tank fails years early.
- Rusty or discolored hot water. The anode rod has dissolved and the tank is corroding from inside. Anode replacement may save the unit if caught early.
- Water pooling around the base. Tank itself is leaking — at this point, replacement is the only fix. Tanks cannot be repaired once the inner liner ruptures.
- Pilot light won’t stay lit (gas units). Thermocouple, gas valve, or venting issue. We diagnose on-site.
If you’re seeing one of these, call (415) 359-4588 — we’ll talk you through whether it’s a tonight problem or a this-week problem before we send a truck.
Our Water Heater Services
From a quick thermocouple fix to a full tankless conversion, here’s everything we handle. Click any service below for full details, pricing, and how it works.
Water Heater Repair
Same-day repair for tank, tankless, and hybrid units. Pilot lights, heating elements, anode rods, T&P valves, gas control valves, and thermostat replacements. Every major brand serviced, written quote before any work starts.
Water Heater Flush Service
Annual flush service to remove sediment, replace your T&P safety valve, and run a full gas leak and venting inspection. Required to keep most manufacturer warranties valid. $49 off through November 2026.
Water Heater Replacement
When repair stops making financial sense — typically year 10-12 for tanks — we install a new unit with full permit pull, seismic strapping, and expansion tank where required. Old unit hauled away.
Water Heater Installation
First-time water heater installation for new construction, ADU builds, and remodels across the Peninsula. Tank, tankless, or heat pump — gas line sizing, venting, and condensate drainage included. Code-compliant with permit pulled.
Tankless Water Heater Repair
Factory-certified repair and descaling for Navien, Rinnai, Bradford White Infiniti, and Rheem RTGH tankless units. Error code diagnosis, flow sensor cleaning, scale buildup removal, ignition repair, and venting troubleshooting.
Commercial Water Heater Repair
Commercial tank, tankless rack systems, and high-capacity units for restaurants, hotels, multi-tenant buildings, and offices. Same-day response, recirculation pump service, ASSE 1017 mixing valves, and commercial permit pulls.
How a Water Heater Repair Call Works
You call, a real plumber answers
Call (415) 359-4588. A licensed plumber asks enough questions over the phone to know whether it’s a no-hot-water emergency, a slow degradation, or a flush-and-it’ll-be-fine situation. Most calls get scheduled the same day.
On-site diagnosis, written quote.
We arrive in your 2-hour window with a text when we’re on the way. We diagnose the unit, walk you through what’s failing and why, and write the price down before any work starts. If we find that replacement is cheaper than repair given the unit’s age, we tell you that — even though we’d make more on a repair.
Repair or replacement, permits pulled, warranty on file.
Most repairs finish the same visit. Replacements take 4–6 hours for tanks, 6–10 hours for tankless. We pull permits where required (most SF and Peninsula jurisdictions require permits for water heater replacement), submit warranty registration for you, and haul the old unit away.
Popular Plumbing Brands We Sell and Service
How Our Water Heater Repair Pricing Works
Most homeowners want a number before they call. We get it — but giving you a flat “water heater repair costs $X” without seeing your unit would be dishonest. Two units with the same symptoms can need completely different repairs. Here’s how we actually price the job.
Diagnostic visit first. A licensed plumber comes out, examines your unit, runs a full diagnostic, and tells you exactly what’s wrong and what it takes to fix it.
Written quote before any work starts. Whether it’s a $200 repair or a $5,000 replacement, you see the price in writing and approve it before we open a single fitting. No verbal commitments, no surprise add-ons.
Three things drive the price on any water heater job:
- What’s actually failing — a thermocouple is a different conversation than a leaking tank
- Your unit type and brand — tankless parts cost more than tank parts; commercial units cost more than residential
- Permit and code requirements — most SF and Peninsula jurisdictions require a permit on full replacements, and code-required expansion tanks, seismic strapping, or venting upgrades add cost
What you won’t pay for:
- Diagnostic fees that mysteriously “become the deposit” if you don’t proceed
- Hourly clocks running while we figure out what’s wrong
- Upsells for things you don’t need
If you want a number before we visit, call (415) 359-4588. Describe the symptoms and the unit’s age and brand, and a licensed plumber can usually give you a ballpark over the phone — no obligation.
Water Heater Repair Across the Peninsula
We dispatch from Burlingame and run same-day water heater repair calls across:
Primary service area: San Francisco · Palo Alto · San Mateo · Burlingame · Millbrae · Hillsborough · San Bruno · Belmont · San Carlos · Foster City · Redwood City · Daly City
Extended service area: Berkeley · Oakland · Fremont · San Jose
Looking for water heater repair in your specific city? See our city-specific water heater pages: Palo Alto · San Mateo · Redwood City · San Jose (and all 17 service areas).
What People says about JK Plumbing
Water Heater Repair FAQ
Why is my water heater not warm enough?
Lukewarm water usually points to a failing heating element (electric units), a pilot or thermocouple issue (gas units), a drifted thermostat, or — most commonly on units 5+ years old — heavy sediment buildup that’s insulating the burner from the water. A flush often fixes the third one; the first three need a service call. Call (415) 359-4588 and we’ll walk through the symptoms over the phone.
Tankless water heater vs conventional — which is better for a Bay Area home?
Tankless water heaters cost more upfront ($4,500–$7,500 installed vs. $2,800–$4,500 for a tank), but they last roughly twice as long (18–20 years vs. 8–12), use 25–40% less energy, and never “run out” of hot water mid-shower.
Conventional tank units are simpler, cheaper to repair, and a better fit if your gas line and venting aren’t already sized for tankless. For most Bay Area homes with 2+ bathrooms and high hot-water demand, tankless pays back the cost difference within 7–10 years. For smaller homes or rentals where simplicity matters more, conventional is still the right call.
How often should I flush my water heater?
Once a year for most homes. Twice a year if you’re on hard water (most of the Peninsula qualifies) or if your unit is over 6 years old. Skipping flushes for 3+ years can void your manufacturer warranty entirely on Bradford White, Rheem, and A.O. Smith units.
How long does a water heater last in the Bay Area?
Conventional gas tank: 8–12 years. Electric tank: 10–15 years. Tankless: 18–20+ years with regular descaling. The Peninsula’s hard water shortens these by 1–2 years if you skip annual flushing.
Do you do tankless conversions?
Yes. Converting from a conventional tank to a tankless unit typically requires upsizing the gas line, adding new dedicated venting (sealed combustion), installing a condensate drain, and electrical for the unit’s controls. We handle all of it as one job with one permit.
Are you licensed to work on commercial water heaters?
Yes. CA Contractor’s License #1080266, held continuously since 2007, covers both residential and commercial plumbing including high-capacity and commercial tankless systems. We carry general liability and workers’ comp; certificates available on request for property managers and commercial accounts.
Do you offer 24-hour water heater repair in San Francisco?
Yes — we run 24-hour emergency response Monday through Saturday for no-hot-water situations, leaking tanks, and gas-smell calls. Closed Sundays for non-emergency work. (415) 359-4588.