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

Avatar for Tankless Plumbing Solutions
Tankless Plumbing Solutions
4.9(
34
)
Tankless Water Heater - Install

Serving San Mateo, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"I called and they were here working 48 hours to install and haul away a tankless water heater. They did finishing work and completed it to my high standards. They communicated very well as I was uneducated in this area. I highly recommend them."
Rinnai
Rinnai
Rinnai
Rinnai
Rinnai

+10

Response time4 hrs
Response rate97%
6 neighbors recently requested a quote
Avatar for Better Water Heaters
Better Water Heaters
4.5(
195
)
Tankless Water Heater - Install

Serving San Mateo, CA and surrounding areas

Approved

In business since 2001

Free estimates

Emergency services offered

"Since my current water heater was 17 years old I decided to replace it before it gave out on me. I emailed Better Water Heaters in the evening with the details and got a phone call from Frans who scheduled Daniel to come and give me a free estimate the next afternoon. In the meantime I got another quote from another installer after texting photos of the current installation. Daniel’s estimate was similar for a standard water heater replacement but although I had not considered a tankless install I asked for a quote on that as well after discussing pros and cons with Daniel. Daniel then waited while I discussed this with my wife and since he could do the install the next day I decided on the tankless install and Daniel arrived the next morning and completed the install in three hours. I am very happy with the quickness and quality of the work as well as the quality of the Rinnai water heater that was installed."
Additional Photos
Additional Photos
Additional Photos
1 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Albert Nahman Plumbing, Heating, and Cooling
Albert Nahman Plumbing, Heating, and Cooling
4.4(
722
)
Tankless Water Heater - Install

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 Facilities Plumbing & Drain
Facilities Plumbing & Drain
4.8(
52
)
Tankless Water Heater - Install

Serving San Mateo, CA and surrounding areas

Approved

In business since 2014

Free estimates

Emergency services offered

"Robert was an amazing plumber to work with. Extremely professional, knowledgeable, responsive and honest. All traits that are hard to come by in this profession. Ever since I found his business, Iâ ve never even bothered to look elsewhere. He never tries to upsell you, gives you options and always cleans up meticulously. Iâ ve recommended him to all my friends and family and they were all happy with his services. So far heâ s fixed my clogged sink, installed and repaired my garbage disposal, came immediately when my storm drain busted, and gave me quotes and advice on a tankless water heater. Hopefully I wonâ t need his services any time soon though!"
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 FDL Plumbing, Inc.
FDL Plumbing, Inc.
5.0(
41
)
Tankless Water Heater - Install

Serving San Mateo, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Credit card accepted

Customers say: True professional

"As a seasoned general contractor, my decade-long collaboration with FDL Plumbing has consistently impressed me. Their commitment to quality, reliability, and professionalism sets them apart in the industry. FDL Plumbing's punctuality and efficiency ensure that projects stay on track and meet deadlines. Their attention to detail guarantees excellent results, whether tackling complex installations or troubleshooting issues. Communication is seamless with FDL Plumbing, fostering strong collaboration and transparency. Their professionalism and integrity shine through in every interaction, making them a trusted partner for any project. FDL Plumbing's dedication to excellence makes them an invaluable asset. With their expertise, reliability, and integrity, you can trust that your plumbing needs will be met with precision and care."
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 In & Out Plumbing & Construction Inc
In & Out Plumbing & Construction Inc
4.2(
79
)
Tankless Water Heater - Install

Serving San Mateo, CA and surrounding areas

Approved

In business since 1998

Free estimates

Emergency services offered

"In & Out is fast and professional.   They bid our job in the morning, and were back that afternoon with new toilet tank flushing devices and had all four of them installed in our bathroom the same day.   They took away the old parts and the boxes the new parts came in.   They are knowledgeable, punctual and tidy.   Should we have any plumbing problems, I would call them right away!"
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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The San Mateo, CA homeowners’ guide to tankless water heater installations

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