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Water Heater Repair & Replacement in San Francisco, CA

Water heater repair and replacement for San Francisco homes ? tank, tankless, gas, and electric. No hot water, leaks, and thermostat failures get priority scheduling. We diagnose on site, quote before work begins, and install replacements with proper venting, connections, and haul-away of the old unit.

  • 60 Years Combined Experience
  • Licensed & Insured
  • Emergency Service
  • Transparent Pricing

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Fixing no-hot-water calls in San Francisco

Diagnosing no hot water

Gas units may fail at the pilot, thermocouple, gas valve, or venting; electric units at breakers, thermostats, or elements; tankless units at flow sensors, scale, or vent errors. We test systematically and quote the repair before swapping parts.

Replacement sizing for San Francisco homes

Household size, fixture count, and peak usage drive tank capacity or tankless flow rate. We discuss efficiency tiers, venting requirements, and earthquake strapping so the new unit is code-compliant on day one.

Tankless and hybrid options

Tankless saves space and can lower gas use when sized correctly. We install major brands with proper gas line sizing and venting ? undersized units cause cold surprises at peak demand.

Water Heater Repair & Replacement in San Francisco, CA
Why ASAP

Why San Francisco homeowners choose us

  • Licensed & insured

    Every job is completed by licensed plumbers with full liability coverage.

  • Repair & replacement

    Tank, tankless, gas, and electric — we diagnose no-hot-water issues and install new units to code.

  • Upfront pricing

    We explain the problem and quote before work begins — no surprise charges.

Repair-first water heater work in San Francisco

Repair-first mindset

When a thermocouple or element fixes the issue on a younger unit, we repair. When the tank is rusting through, we show replacement numbers honestly.

Permits and inspections

Gas water heater replacements in San Francisco often require permit and inspection. We include that in the quote so you are not surprised at the end.

Maintenance extends life

Annual flushing on tanks and descaling on tankless units reduce surprise failures. Ask during your service call.

Water Heater Repair & Replacement in San Francisco, CA
Customer reviews

Water Heater Repair & Replacement services reviews near San Francisco

Google Reviews 269 reviews
Google review

I’ve been using Don since his business began. Don always offers the best prices for all San Francisco draining needs. I’ve used him for faucet installations, garbage disposal, drain clogs, outdoor and indoor plumbing needs, plumbing leaks, sewer cleaning, among other services for my properties. My neighbors also raved about his coverage in the San Francisco bay area region for shower installation, water tank needs, drain cleaning, sink draining, etc. He far and away exceeds my expectations especially in the San Francisco Bay Area region where prices are exorbitant. With Don, you get bang for your buck for professional plumbing and drainage needs with free warranty for the first month! I’ll be using Don for years to come! Hey Don, time to start a loyalty program?!

liqun jiang

Dec 22, 2022

Google review

I had a water heater that broke recently. I used ASAP Plumbing and was very satisfied with my experience with them. They came quickly, were responsive, explained everything I needed to know and honored the price they quoted me over the phone. Very professional. I am glad to know that there is a company like ASAP Plumbing I can call on if I need a plumber in the future. I highly recommend them.

Ellen Markoff

Jul 6, 2026

Google review

Came home to no hot water. Asked neighbors who to call. ASAP was true to their name. Showed up almost immediately, diagnosed the failed hot water tank, and got a replacement installed very fast. Also fixed a flow issue we had. Good communication throughout the process, which I greatly appreciate.

Andy Berschauer

Dec 8, 2025

Google review

Donald from ASAP Plumbing was super quick and responsive. Helped me out in both San Francisco and South San Francisco. On the first occasion, he was able to unclog the drain in no time! On the second occasion, he was able to push out the "thing" that was stuck in the pipes, saving me from having to potentially replace the toilet entirely!! Super professional and easy going. 100% recommend.

Vinson Xia

Jul 16, 2025

Google review

Our hot water heater died after reaching the end of its life, and ASAP Plumbing (Kong was our plumber) came the same day and installed a brand new hot water heater for us. They were easy to work with and worked quickly! The original estimate for the job was that it would take 3 hours for 1 person, but they ended up bringing on a second person to help, and the whole thing was done in 1.5 hours. Communication was prompt, service was great!

Sherry Lin

Jul 16, 2025

Google review

Quick and responsible service. Don checked and repaired our leaky sink and water faucet adapter the same day that I called for the service. The work was professionally performed with proper cleanup afterward. I also like the fact that he wore shoe covers inside the house without the need for me to ask him to do so. Great work!

Jonathan

Dec 22, 2023

Google review

Don was wrapping up a job in Redwood City and heading to San Francisco, so he offered to stop by my place (on the way) immediately and get things done. I like that. He did a great job and got it done and confirmed everything was working and cleaned up before he left. I honestly don’t know the going rate for such work, so I cannot comment on the “good value” button, but I was very satisfied. He was OK with being paid with cash. That’s slowly becoming a good business advantage.

Chris Cavigioli

Jul 28, 2023

Google review

If you’re looking for a reliable plumber, Don should definitely be on speed dial! I’ve been using his services for 2 years. He’s fixed everything from clogged sinks to toilet clogs and also replaced my toilet and garbage disposal. I live in an older home in San Francisco and some of those drain clogs were extremely difficult to fix but nothing Don can’t handle. Give him a call!

Marcos Cutino

Dec 29, 2022

No hot water? Repair and replacement options in San Francisco

No hot water disrupts showers, dishes, and laundry the same day it fails. ASAP Plumbing Pros repairs gas, electric, tank, and tankless water heaters in San Francisco — and installs replacements with proper venting, seismic strapping, and haul-away when repair no longer makes financial sense.

Repair-first, replace when it is smarter

Thermocouples, elements, thermostats, and valves are common fixes on younger units. Rusty tanks, repeated leaks, and units past their rated lifespan often favor replacement. We show both paths with real numbers. See equipment options on our water heater repair & replacement page.

Sizing for San Francisco households

Fixture count and peak demand drive tank gallons or tankless flow rate. Undersized tankless units cause cold surprises; oversized tanks waste energy. We size for how your home actually uses hot water.

Code-compliant installation

Gas replacements frequently require permit and inspection. Earthquake strapping and correct venting are not optional extras — they are part of a safe install we include in the quote.

Ready to schedule?

Call (415) 728-6391 or contact us for water heater service in San Francisco. Say whether you have no hot water, a leak, or strange noises so we prioritize and bring the right parts.

Good to know

What San Francisco Homeowners Ask About Water Heater Repair & Replacement

How quickly can you help with water heater service in San Francisco?

No-hot-water calls are prioritized for same-day or next-day service.

Do you repair tankless water heaters in San Francisco?

Yes ? major brands serviced; descaling and flow sensor issues are common fixes.

Repair vs. replacement ? how do you decide?

We compare repair cost, unit age, and efficiency. Tanks over 10?12 years often favor replacement.

How long does installation take?

Most tank swaps finish in half a day; tankless may take longer if venting or gas line upsizing is needed.

Do you haul away the old heater?

Yes ? removal and disposal are included in replacement quotes.

What size water heater do I need?

We size by household fixtures and peak demand for tanks or flow rate for tankless.

Are permits required?

Gas replacements often require permit and inspection; we handle that process.

What areas near San Francisco do you serve?

We serve San Francisco, Daly City, San Mateo, South San Francisco, San Bruno, Millbrae, and communities throughout San Mateo County. Call (415) 728-6391 to confirm service for your address.

Ready when you are

Plumbing emergency? We're on the way.

Call (415) 728-6391 or request service online — 24/7, every day of the year.