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Top-Rated Tankless water heater repair pros in San Mateo - Updated Nov 2026

Avatar for Facilities Plumbing & Drain
Facilities Plumbing & Drain
4.8(
52
)
Tankless Water Heater - Repair

Serving San Mateo, CA and surrounding areas

Approved

In business since 2014

Free estimates

Emergency services offered

"I did a bit of research even though we had been without hot water for about a week. Mainly because we had roofers working and no roof where the water heater would be going in the garage. I received a call from Robert before we were ready for the project to begin and wrote down his info including the quote. I wanted a long warranty and not many companies were offering the 12 yr warranty. That was a plus, and when I finally made the decision to go with Facilities Plumbing and Drain I called Robert and he said Frankie could come right away...within the hour...it was about 550PM!! He indeed showed up and went straight to work with a smile. What a great attitude he has, especially considering he had been working since 7am. Hot water heater installed and he cleaned up everything too. Very professional, very nice and efficient."
Starbucks 100-Gal Waterheater
Sediments inside supply line
3M 100,000-Gal
dual 3m filter install
3M 100,000-Gal

+44

Response time6 hrs
Response rate100%
72 neighbors recently requested a quote
Avatar for Albert Nahman Plumbing, Heating, and Cooling
Albert Nahman Plumbing, Heating, and Cooling
4.4(
722
)
Tankless Water Heater - Repair

Serving San Mateo, CA and surrounding areas

Approved (Corporate)

In business since 1981

Free estimates

Warranties offered

"The first visit lead to cleaning the area around the heater and burners and checking the thermocouple. Sadly that seemed to make it worse. Less than a week later No hot water for over 30 hours till the second technician replaced the thermocouple. All is perfect now. No charge for the second visit. The next step, if needed will be a tankless and their quote looks a bit steep. But I am really hoping I won’t need to go that far."
Living room Mini-Split
Aquasana home Filtration
Almost no disturbance at EBMUD meter
Navien with filtration to protect the heat exchanger
New house valve and Pressure Reducing Valve

+73

Response time8 hrs
Response rate100%
44 neighbors recently requested a quote
Avatar for FDL Plumbing, Inc.
FDL Plumbing, Inc.
5.0(
41
)
Tankless Water Heater - Repair

Serving San Mateo, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Credit card accepted

Customers say: True professional

"**Highly recommend FDL Plumbing!** Francisco from FDL Plumbing was prompt, professional, and efficient. He arrived at 10am to diagnose my water heater issue and clearly explained my options. After discussing pricing, we agreed to proceed, and Francisco had a new unit installed by 11:45am, exceeding his initial timeframe. Francisco was a pleasure to work with â he completed the job expertly while maintaining a friendly demeanor. His work ethic and competitive pricing (especially for San Francisco) were refreshing. Thank you, Francisco, for the outstanding service!"
Existing PRV
New 3/4 Pressure reducing Valve
Existing
New Kitchen Sink/Faucet/Disposal
New Home in Moraga CA

+10

Response time2 hrs
Response rate94%
Recommended by67%of homeowners
Avatar for CLEVER PLUMBING & ROOTER INC
CLEVER PLUMBING & ROOTER INC
4.9(
37
)
Tankless Water Heater - Repair

Serving San Mateo, CA and surrounding areas

Approved

Free estimates

Credit card accepted

Offers commercial services

"Angel and Clever Plumbing team are the best! They replaced water heaters, repaired leaks, clogged drains and various other plumbing jobs. I highly recommend Clever Plumbing for any plumbing issues! He has helped me with multiple plumbing jobs, both big and small, and has always been great to work with. He’s very responsive, quick to schedule, and does a great job figuring out practical solutions. He’s reliable, knowledgeable, and someone I know I can count on when something comes up. I wouldn’t hesitate to call him again or recommend him to others, you will not regret it!"
Plumbing
Faucet replacement
Faucet replacement
Faucet replacement
Faucet replacement

+10

7 neighbors recently requested a quote
Recommended by81%of homeowners
Avatar for Jess Plumbing
Jess Plumbing
4.9(
50
)
Tankless Water Heater - Repair

Serving San Mateo, CA and surrounding areas

Approved

In business since 1999

Free estimates

Emergency services offered

"Jesus repaired the leaking water pipes behind the shower valve. It was Sunday, but his response was quick and he showed up on time. I think he is the best honest plumber I ever met. He did a great job with reasonable price."
Plumbing Project
Plumbing Project
Plumbing Project /water main
Old gate valve/ doesn’t shut off water
Installed new Zoeller sewer tank lid

+178

Response time1 day
Response rate100%
Recommended by93%of homeowners
Avatar for In & Out Plumbing & Construction Inc
In & Out Plumbing & Construction Inc
4.2(
79
)
Tankless Water Heater - Repair

Serving San Mateo, CA and surrounding areas

Approved

In business since 1998

Free estimates

Emergency services offered

"In and out plumbing is great!  Easy to make an appointment... called at 9pm and scheduled service for the following day.  Plumber Mike was on-time and polite.  After showing him our leaky shower faucet, he provided two quotes- one to replace parts, the second to upgrade the plumbing to today's standards (1955 house).  After a few minutes we opted for the former.  Unfortunately there was a bolt that seemed to be glued in and so the handle stems had to be cutt off (also explains why my husband couldn't unsrew it the evening before).  The replacement were of an old design therefore Mike warned us that it may be difficult to find at a store.  He spend 45 minutes looking for it that day and upon not finding it at open stores, returned at 9am sharp the following morning to pick up the broken part (which he had replaced the night before so that the water could be turned back on for us) and spent about 60 minutes away while at another store.  Luckily he was able to find the part and had the faucet fixed by 11am.  During the entire work Mike was kind, communicative and obviously working hard to successfully complete the job.

Additionally, another plumber, Steve from In and Out Plumbing provided service just a few days prior for another problem... a corroded pipe with a hole was leaking water from our kitchen drain.  Steve was also very polite, communicative about our options for the repair, and was able to replace 2 feet of piping in about 30 minutes. 

In and Out Plumbing has been great on two occasions!  We will definitely use them again if we have any more plumbing issues."
San Francisco Sewer Line
Floor Drain
San Francisco Sewer Line
Floor Drain
San Francisco Sewer Line

+27

Response time1 day
Response rate99%
12 neighbors recently requested a quote
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