Professional water heater replacement for South San Francisco homes and businesses. New tank and tankless water heaters installed with proper venting and connections.
Older units lose efficiency and leak. We install modern tank and tankless heaters to code. Our licensed technicians serve South San Francisco and nearby Bay Area communities with upfront pricing and quality workmanship.
Every job is completed by licensed plumbers with full liability coverage.
New units installed with correct venting, connections, and permit-ready work.
We explain the problem and quote before work begins — no surprise charges.
Schedule service in South San Francisco today. Use our contact form or call for a free estimate on water heater replacement.
Customer reviews
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
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.<br><br>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
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.<br><br>Good communication throughout the process, which I greatly appreciate.
Andy Berschauer
Dec 8, 2025
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
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.<br><br>He did a great job and got it done and confirmed everything was working and cleaned up before he left.<br><br>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
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
I worked with Don for a few years now. Over the years, he had helped me install a toilet, garbage disposal, and fix a few emergency nasty sewer drain clogs. He never fails to fit me into his schedule. Don is one of the most honest plumbers I have dealt with. Ask your questions and he will be more than happy to help. I switched a lot of different plumbers over the years but Don is definitely my first call now. Go with DDD Plumbing San Francisco Drain Cleaning!
행운목
Dec 23, 2022
Don was recommended by a friend of mine. He has helped me replace a sink faucet, a toilet, and installed an instant hot water heater. He has been fantastic with each. Always on time, checks in the day before for the appointment, gives quotes beforehand, knows what he is doing and is great at it, will order and bring any pieces you need beforehand, and is very friendly. Highly recommend!
Lydia Simmons
Dec 15, 2022
When you need reliable water heater replacement in South San Francisco, ASAP Plumbing Pros delivers fast, professional results. Our licensed technicians arrive equipped to diagnose the problem, explain your options, and complete the work with upfront pricing.
We proudly serve South San Francisco and communities throughout San Francisco and San Mateo County. Whether it is an emergency call or a scheduled appointment, you get the same commitment to quality and customer satisfaction.
Use our contact form or call (415) 728-6391 to request water heater replacement in South San Francisco. We are open 24/7 because plumbing emergencies do not wait.
Replacements are typically scheduled within a few days; emergency installs may be available.
Same-day replacement is possible when units are in stock.
Replacement quotes include removal, installation, and code-compliant connections.
Call (415) 728-6391 or request service online.
