Flow Masters Plumbing, Drain and Water Heater
Plumber · Daly City, CA
Our verdict
4.9★ Google, 687 reviews; professional=57 leads all themes in 100 analyzed — unusually strong workmanship signals. Two-appointment model (assess then repair) noted as a minor friction point.
Scores are our editorial reading of published customer reviews — not a verification, license check, or guarantee.
Our opinion, based on the 100 reviews we analyzed from Google, Yelp and BBB · Analysis updated Jun 2026 · How we decide ↗
What reviewers praise
professional theme in 57 of 100 analyzed reviews — the highest count of any single theme; workmanship=11 adds depth.
2 cited reviews
“Great service from Flow Masters. First Sebastian came out and assessed and diagnosed several issues, explaining each in detail and offering a range of solutions at a range of costs. Both gentlemen were professional and handled service with friendliness, knowledge, respect for my home.”
“Sebastian gave us an upfront cost and is helping us work out a payment plan for the work done. We were without water for a few days because of a leaky pipe, and they came out quickly to assess and repair.”
Cited in 3 of the 100 reviews we analyzed — 1 cited review not excerpted here.
Holiday and weekend emergency response confirmed — dispatched on Thanksgiving Day and Christmas Eve.
1 cited review
“I'm very grateful to the Flow Masters team for getting out to the home right away, diagnosing the issues, and most of all — then putting in the new furnace on Thanksgiving day.”
Cited in 2 of the 100 reviews we analyzed — 1 cited review not excerpted here.
Upfront cost quoted with multiple pricing tiers offered before work begins; payment plan assistance cited in 1 review.
2 cited reviews
“Sebastian gave us an upfront cost and is helping us work out a payment plan for the work done. We were without water for a few days because of a leaky pipe, and they came out quickly to assess and repair.”
“Great service from Flow Masters. First Sebastian came out and assessed and diagnosed several issues, explaining each in detail and offering a range of solutions at a range of costs. Both gentlemen were professional and handled service with friendliness, knowledge, respect for my home.”
What reviewers report — the concerns
Other directories bury these. We think you should read them before you call. Every concern below comes from the reviews it cites.
Two-visit model (separate assessment and repair appointments) adds scheduling friction; cited by at least 1 reviewer as a drawback.
Cited in 1 of the 100 reviews we analyzed.
Keep it in proportion: these concerns are cited in 1 of the 100 reviews we analyzed. Most reviewers report positive experiences — see the full rating picture below.
The evidence — in reviewers' own words
Critical
“I used them in March, and should have written this earlier. I would advise making sure u know their rates and what they propose to do. Our tub leaked and it turned out the plumber needed a part to test the drain, and had to,leave to go get it since it wasn't in his truck. Turned out he couldn't fix the problem (understandable, it was the tub, not the drain) but wow, the charge was the hourly rate of $250, for 11/2 …”
“Do Not Use Flow Masters. Over $2000 in “repairs” !!! Update: even after reading their reply below, do not use them, they will charge you for things they break and fix things that do not need to be “fixed” . They say they didn’t charge me for the sink they were not supposed to “fix” then what was the extra $600??? Like I say below, they will validate the time they spend at the house looking for a leak by finding …”
“I intially hired Flow Master's to unclog a bathroom toilet. Their equipment became stuck in the pipes and after much effort and a gigantic mess they were able to unclog the pipes. However in the process they cracked the interior of my toilet. The owner was called and he came to view the damage and quickly agreed to buy a new toilet for me and a few weeks later he had his crew come back and install the new toilet. …”
Positive
“I was very impressed with the urgency FlowMasters took with the project. They always showed up early and equipped and ready to work. We had Kevin, who is really good at the trade and neatly completeld the drain project.”
“With so much rain I noticed a possibly unrelated leak in the area where they had been working. Tina was quick to send out the original crew to investigate. I was encouraged and amazed that they would respond so quickly and with the confidence and integrity to honor stand behind their work. Turns out it was an unrelated issue but I was impressed with the professionalism from Fernando and Chase and everyone at …”
Quotes are reproduced verbatim from public reviews on the platforms shown; we select which to feature, and selection reflects our editorial judgment. Report a quote that doesn't match its source ↗
The rating picture
Newest review in our sample: Feb 2026.
Across platforms
Should you hire Flow Masters Plumbing, Drain and Water Heater?
Best for
- Emergency and same-day calls
- Complex installs and remodels
Hire if
- You need high-quality work that holds up over time
- You need a plumber who actually shows up when scheduled
Think twice if
- You need rock-bottom prices with zero flexibility on the quote
- You need guaranteed sub-hour response for true emergencies
Advice derived from the review analysis above — how we decide.
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Find plumbers near you
Flow Masters Plumbing, Drain and Water Heaterisn't in one of our ranked city guides yet — the nearest covered markets are below.
Nearby: Daly City · Half Moon Bay · Stinson Beach · Richmond