Professional water heater replacement for San Mateo 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 San Mateo 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 San Mateo today. Use our contact form or call for a free estimate on water heater replacement.
Customer reviews
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
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
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
They came out and figured out where my water leak was coming from. They also diagnosed another plumbing issue that I did not call for. I was able to get 2 problems solved at one time. I truly appreciate the service! I have them in my contacts now and will refer them for plumbing work.
Tamara Nobles
Feb 18, 2026
I've worked with Donald of ASAP Plumbing several times over the past 4 years and can confidently recommend their services. He's unclogged drains, replaced kitchen sink water valves and garbage disposal, and resolved an active leak in my old rental apartment kitchen. He's prompt to respond to inquiries, shows up during the expected time window, and overall is a very friendly and personable guy.
Linden McGreevy
Jan 22, 2026
I've been looking for a plumber for probably 4 years now. They either don't show or Pad the quote or double the estimate, or ask such a ridiculous price that I end up buying the equipment.<br>And doing the job myself.<br><br>I was so pleasantly surprised by ASAP plumbing!... the representation, the quick call back, the professionalit, the price, the promptness and the immediate response, everything everything was amazing. I already called them back to do another job.
Gena Starkweather
Nov 6, 2025
Super quick response, able to fix all the issues they saw at a reasonable price after hours for emergency faucet and pipe replacement. Gave me constant updates and provided photo evidence for all issues they saw and recommended preemptive fixes that would’ve caused issues in the future. Super professional and was able to fix all issues in two hours.
Gia Ni
Aug 29, 2025
When you need reliable water heater replacement in San Mateo, 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 San Mateo 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 San Mateo. 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.
