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Fast Water Heater Logo

(425) 636-7038

Call before noon for same day service.

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Water Heaters in San Mateo, CA

Call (425) 636-7038

Same-Day Installation · Free Estimates · No Trip Fees

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Home | Service Areas | Bay Area Water Heaters | San Mateo

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Heater Experts Today!

Our Hours

MON-FRI 7:00AM – 7:00PM

SAT-SUN 8:00AM – 5:00PM

Reliable Water Heater Services in San Mateo, CA

Contact Fast Water Heater Co. for expert water heater installation, repair, and maintenance in San Mateo, CA—customized for local homes. We deliver consistent hot water and superior service for your daily routines.

Our licensed, bonded, and insured San Mateo technicians handle everything from classic tank-style heaters to high-efficiency tankless and heat pump systems—right-sized for San Mateo’s mild mid-Peninsula climate and Cal Water-delivered supply.

 

Brands We Install & Service:

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Certified technicians, free estimates, no trip fees.

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Trusted & Award-Winning

Angi Super Service Award 2022 Google 4.8 Stars HomeAdvisor Elite Service

Water Heater Codes & Compliance in San Mateo, CA

Permits Required

All water heater replacements in San Mateo require a permit pulled through the City of San Mateo Planning & Building Department. We handle the San Mateo permit process end-to-end so your project stays on schedule.

California Plumbing Code (CPC) — 2022 Edition

San Mateo enforces the 2022 California Plumbing Code with City of San Mateo amendments. We follow every requirement on every job.

Seismic Strapping

Two approved metal straps (min. 20-gauge) required—one in the upper third and one in the lower third of the tank. Mandatory on all installs and replacements per CPC 507.2 (California Plumbing Code).

Expansion Tanks

Required on all closed plumbing systems (backflow preventers, PRVs, or check valves present) to prevent thermal expansion damage per UPC 608.3.

Safe Installation Zones

Gas water heaters prohibited in bedrooms, bathrooms, and closets opening into living spaces. Garage units must have ignition sources ≥18 inches above floor unless FVIR-listed.

T&P Valve, Venting & Drip Pans

T&P discharge pipe must terminate safely 6–24″ above ground. Proper venting (Type B or stainless for condensing units) and drip pans in leak-risk locations are required per UPC 507.5 / 608.3.

Why San Mateo Chooses Fast Water Heater Co.

San Mateo’s trusted local plumber since 1986. Fast Water Heater Co. is a fully licensed California contractor (CSLB), bonded, and insured — every San Mateo installation is pulled under the correct City of San Mateo Planning & Building Department permit and meets the current 2022 California Plumbing Code.

Same-Day Emergency Service

Call by noon for same-day service—7 days a week. Mon–Fri 7am–7pm, Sat–Sun 8am–5pm. No extra charges for weekends.

All System Types

Gas, electric, tank, tankless, heat pump, hybrid—we install and repair them all with parts on-truck for fast turnaround.

Free Estimates · No Trip Fees

Transparent upfront pricing with no hidden fees—ever. Free in-home consultations and no trip fee on any call.

No Weekend Surcharges

Emergencies don’t follow a schedule. We provide seven-day service at flat rates—no extra charges on weekends.

Prepared Technicians

Background-checked, certified techs with well-stocked trucks. Locate your unit’s model and serial number beforehand for a smoother visit.

San Mateo Neighborhoods & Surrounding Areas We Serve

Inside San Mateo

  • Downtown San Mateo
  • Hayward Park
  • Hillsdale
  • San Mateo Heights
  • Shoreview
  • Beresford Park
  • Laurelwood
  • Sugarloaf

Nearby Peninsula

  • Burlingame
  • Foster City
  • Belmont
  • San Carlos

Wider San Mateo County

  • Redwood City
  • Hillsborough
  • Millbrae
  • Daly City
  • South San Francisco
  • Half Moon Bay
📞 Call by 12 PM for same-day service across the San Mateo metro & mid-Peninsula area. Licensed, bonded, and insured in California since 1986 — CSLB contractor license on file with every quote.

Professional Water Heater Installation in San Mateo, CA

Same-Day & Next-Day Installs

Call before noon for same-day service. Stocked trucks carry Rheem, Bradford White, and Rinnai so your hot water is restored fast.

Code-Compliant Every Time

Every install follows California Plumbing Code (CPC), Title 24 California Energy Code, and San Mateo permit requirements—including mandatory seismic strapping.

All System Types

Tank, tankless, heat pump, hybrid, gas, electric—we install them all and help you choose the best fit for your home size, usage, and budget.

Free Estimates · No Trip Fees

Transparent upfront pricing with no hidden fees. Free in-home consultations—no trip fee, weekday or weekend.

Licensed, Bonded & Insured

Background-checked technicians fully certified on Rheem, Bradford White, and Rinnai systems—backed by decades of California and Bay Area experience.

Warranty Support

Full system testing, homeowner walkthrough, and warranty claim assistance after every installation.

Water Heater Replacement in San Mateo

Expert Replacement Service

Over 40 years replacing water heaters across San Mateo—from single-family homes to bungalows and hillside homes. Full removal, installation, and permit coordination included.

Responsive & Tailored

Upgrading to a more efficient model or switching to tankless? Same-day in most cases—options matched to your needs and budget.

Know When to Replace

Units over 10 years old, frequent repairs, rising energy bills, or rusty water are signs it’s time. We’ll give you an honest recommendation.

Transparent Pricing

Initial phone estimate, final price confirmed on-site. No surprises—fair, honest pricing for quality work.

Top Brands Stocked

Rheem, Bradford White, Rinnai, Navien, and Noritz on our trucks—replacements happen fast without waiting on orders.

Permit Handling Included

San Mateo requires a permit for replacements. We manage the permit process end-to-end—no delays.

Questions about your water heater? We’re ready to help.

(425) 636-7038

Mon–Fri 7am–7pm · Sat–Sun 8am–5pm · No Trip Fees

Water Heater Repair in San Mateo

No Hot Water

Faulty thermocouples, failed heating elements, or tripped reset—we diagnose and repair fast, often same day.

Pilot Light & Ignition

Pilot won’t stay lit? We replace the thermocouple, thermopile, or gas valve assembly to get your system firing reliably again.

Leaks & Pressure Issues

T&P valve discharge to tank leaks—we identify and fix the source fast to stop water damage before it starts.

Anode Rod Replacement

Prevents tank corrosion and extends heater life. We offer dual-rod upgrades for added longevity in San Mateo’s Cal Water blend of Hetch Hetchy imports and local groundwater.

Sediment Flushing

Annual tank draining keeps your unit efficient and prevents premature failure from sediment buildup.

Repair vs. Replace Advice

Units over 10 years old may cost more to repair than replace. Honest, no-pressure assessment every time.

Rebates & Savings for San Mateo Homeowners

PG&E Heat Pump Rebates

PG&E offers rebates on qualifying ENERGY STAR heat pump water heaters for San Mateo customers, with higher incentive tiers available for income-qualified households through BayREN. Check pge.com/rebates for current amounts and eligibility.

PG&E Gas Tankless Rebates

Rebates available on qualifying high-efficiency natural gas tankless water heaters (UEF ≥ 0.95, ENERGY STAR). Check pge.com/rebates for current qualified product lists.

California HEAR Program

The California HEAR program (funded by the federal IRA) provides rebates for heat pump water heaters with higher tiers for income-qualified households. Administered through the California Energy Commission and TECH Clean California.

BAAQMD Zero-NOx Rules

Bay Area Air Quality Management District (BAAQMD) Rules 9-4 and 9-6 phase out NOx-emitting natural-gas water heaters in our region, with zero-NOx requirements for residential units beginning January 1, 2027. A heat pump water heater is increasingly the future-proof choice for San Mateo homes. Learn more.

San Mateo Water Heater FAQs

Answers to the questions San Mateo homeowners ask us most.

Don’t see yours? Call us at the number above or request service online.

How much does water heater installation cost in San Mateo, CA?
Most San Mateo homeowners invest in the mid-to-upper tier for a professionally installed, code-compliant water heater once you include the tank or tankless unit, expansion tank, seismic strapping, earthquake-rated gas flex, permit fees with the City of San Mateo Building Division, and labor by a licensed C-36 plumber. Older homes in Downtown San Mateo, Hayward Park, and San Mateo Heights often need venting, gas line, or electrical upgrades to meet the California Plumbing Code and Bay Area Air Quality Management District (BAAQMD) Rules 9-4/9-6. We give free, itemized quotes by phone or in-home — call (425) 636-7038.
Do I need a permit to replace a water heater in San Mateo?
Yes. The City of San Mateo Building Division requires a plumbing permit for any water heater replacement, including like-for-like swaps. The permit covers T&P relief valve and discharge line, seismic strapping (two straps in the upper and lower third of the tank — mandatory in California’s seismic zones), gas connector, venting, expansion tank on closed systems (Cal Water service typically uses a backflow preventer that creates a closed system), and a drain pan for interior installs. We pull the permit on your behalf and meet the City inspector at the property.
Tank, tankless, or heat pump water heater — what works best in San Mateo?
All three perform well in San Mateo’s mild mid-Peninsula climate. Tank units (40–75 gal) are the most affordable and fastest to install, ideal for replacements in Beresford Park, Shoreview, or Laurelwood. Tankless gas units are popular for larger Hillsdale and Sugarloaf homes with multiple bathrooms. Heat pump (hybrid electric) water heaters are increasingly attractive thanks to federal Inflation Reduction Act credits plus California’s electrification push — BAAQMD Rules 9-4 and 9-6 are phasing out NOx-emitting gas water heaters, so a heat pump upgrade future-proofs your home. We’ll walk through all three with real numbers for your San Mateo address.
My water heater is leaking — is this a same-day emergency in San Mateo?
Usually, yes. A tank leak doesn’t fix itself and typically gets worse quickly. If you see water pooling around the base, dripping from the T&P valve, or leaking from fittings, shut off the cold inlet and the gas (or breaker) and call (425) 636-7038. We keep common 40/50 gal tanks and popular tankless units stocked for same-day installs across San Mateo, Burlingame, Foster City, Belmont, and San Carlos — most emergency calls placed before noon are wrapped up the same day with the permit filed the next business morning.
How long does a water heater last in San Mateo with Cal Water service?
California Water Service Company (Cal Water) delivers a blend of SFPUC Hetch Hetchy imports and local groundwater to San Mateo, producing moderately soft water (typically 40–80 ppm hardness depending on neighborhood and season). With proper anode rod service, most tank units in San Mateo last 9–13 years. Tankless units flushed annually routinely reach 17–19+ years. Annual maintenance is particularly valuable for homes in Shoreview near the Bay, where humidity adds stress to external components.
Can you install a tankless water heater in an older San Mateo home?
Yes. San Mateo has many early-20th-century homes in Downtown San Mateo, Hayward Park, and San Mateo Heights where we upgrade to tankless regularly. Older homes often need a dedicated 3/4″ gas line run from the meter, a Category III or IV stainless vent through the wall, a condensate drain, and a 120V outlet near the unit. We handle all of it, pull the plumbing and mechanical permits through the City of San Mateo Building Division, and schedule the BAAQMD-compliant install around your day.
Do you service the full mid-Peninsula area?
Yes. Our licensed California plumbers cover all of San Mateo — Downtown San Mateo, Hayward Park, Hillsdale, San Mateo Heights, Shoreview, Beresford Park, Laurelwood, and Sugarloaf — plus neighboring Burlingame, Foster City, Belmont, and San Carlos, and out to Redwood City, Hillsborough, Millbrae, Daly City, South San Francisco, and Half Moon Bay. Same-day service is the norm when you call before noon.
What water heater rebates are available in San Mateo?
San Mateo residents can stack multiple incentives on a heat pump water heater: federal Inflation Reduction Act tax credits (up to 30% via 25C) plus California’s TECH Clean California and BayREN Home+ rebates (often $1,000–$4,500 depending on income and equipment), and PG&E electrification rebates. Peninsula Clean Energy often layers additional incentives on heat pump upgrades for qualifying households. We hand you the completed paperwork for every applicable program at install — no scavenger hunt.

What San Mateo Customers Are Saying

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