iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%95+51.8Reliability 24%96+23.3Value 14%84+11.9Replies to reviews 7%100+7.1Experts Score= 94Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.94SCORE
AGradeiLetter from the Experts Score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = under 20.
#4 of 14 sump pump repair servicesiPosition by Experts Score among all companies we track in this category. · better than 77%
5.0★★★★★715 Google reviews · 23 photos
97%five-star reviews
4.92★last 12 monthsiAverage stars on reviews from the last 12 months only.
0.7%1–2★ in 2 yearsiShare of 1–2★ reviews in the last 24 months — or the 20 newest reviews when the company had fewer than 20 in that time.
100%reviews answered by the owner
$1.2ktypical billiMedian bill customers of this company reported in their reviews (needs 3+ priced reviews).
Flow Masters Plumbing, Drain and Water Heater at a glance
Customers frequently praise the company for punctuality, professional communication, and detailed explanations of services like water heater installation, leak detection, and drain repairs. While many reviewers highlight the thoroughness and quality of the work, some low-star comments criticize high pricing and a lack of follow-up on estimates. The owner responds to all reviews, addressing concerns about billing and service issues.
Google rating: 5.0 out of 5 from 715 reviews (97% five-star).
Reviews on this page: 715 Google reviews (575 with written comments, 10 with photos).
Owner responses: the business replied to 100% of reviews.
Most recent review: October 21, 2026.
Service: Sump Pump Repair Service serving San Francisco, California.
Data from Google, last updated October 25, 2026.
Score profile vs other sump pump repair services
Score per factor (100 = best)iEach factor is scored 0–100 on absolute terms (star average, share of 1–2★ reviews, price verdicts…); standing within the category can only raise it, never lower it.. Strongest: craft & service and momentum; weakest: value.
This companySump Pump Repair Services median0 = centre, 100 = best
SatisfactioniSatisfaction · 54% of the scoreRecency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.Flow Masters Plumbing, Drain and Water Heater: 95/100 on this factor. Category median: 90.A
95
ReliabilityiReliability · 24% of the scoreHow rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.Flow Masters Plumbing, Drain and Water Heater: 96/100 on this factor. Category median: 92.A
96
Craft & serviceiCraft & service · penalty only, up to −10 pointsGoogle review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.Flow Masters Plumbing, Drain and Water Heater: 100/100 on this factor. Category median: 98.A
100
ValueiValue · 14% of the scoreCustomers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Flow Masters Plumbing, Drain and Water Heater: 84/100 on this factor. Category median: 95.A
84
MomentumiMomentum · penalty only, up to −10 pointsPenalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.Flow Masters Plumbing, Drain and Water Heater: 100/100 on this factor. Category median: 100.A
100
Replies to reviewsiReplies to reviews · 7% of the scoreHow often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.Flow Masters Plumbing, Drain and Water Heater: 100/100 on this factor. Category median: 62.A
100
Bar = this company · dark tick = category median.
Star ratings
715 Google reviews we collected
5.0of 5
5 stars69597%
4 stars142%
3 stars20%
2 stars00%
1 star41%
Praise vs complaints
Phrases our text analysis found in 575 written reviews
99%praise
Praise1,19499%
Complaints181%
PriceiGoogle asks reviewers whether the price was great, reasonable or overpriced; these are their answers.
Price verdicts customers left with their Google review
95%fair
Great price2014%
Reasonable9667%
Overpriced64%
Not sure2215%
$1.2k+156% vs typical sump pump repair services
Middle half of what 117 customers paid ($529–$1.9k) · gold mark = category median.
Topic share
How often each topic comes up in the written reviews
7topics
Staff & attitude35029%
Speed & response28724%
Quality & results18315%
Would recommend13911%
Communication12410%
Price & value807%
Honesty & trust494%
What customers talk about
We read 575 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“They were very professional, and solved the issue with my broken ignitor on my hot water heater right away.”
“…, made a big mistake for not looking at their yelp reviews, extremely unprofessional and no common sense, using bad fault language and have water leek…”
“Responsive, friendly, reasonably priced, and they've done fantastic work every time we've used them.”
“This was an all day installation that required much attention to detail.”
“Edit: The owner reached out to apologize and offered to pay for any damaged.”
“We are very appreciative of Roberto and Jose & the excellent job done and strongly recommend Flow Masters for expertise and efficiency.”
“Cannot believe why these folks are so highly recommended.”
“Explained the whole process before starting and explained the process of working it after installing it.”
“Never followed up with an actual quote despite promising one soon.”
“Prompt, courteous, professional service at a reasonable price”
“Then they broke a piece of pipe and overcharged us $600 over the estimate with no real explanation of what the over charge was for!”
“Sebastian gave us an upfront cost and is helping us work out a payment plan for the work done.”
People customers mention
Connor17 reviews
Flowmasters17 reviews
Alberto15 reviews
Conor13 reviews
Juan13 reviews
Kevin11 reviews
praise complaint · found by our text analysis, Google review wording unchanged.
Reviews for your job
Customers hired Flow Masters Plumbing, Drain and Water Heater for 8 kinds of job. Pick one to see what they paid and said.
Niklas1 reviewiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 2 weeks ago★★★★★
Miguel and Daniel were great! They were very professional, and solved the issue with my broken ignitor on my hot water heater right away. Miguel even thought to mention ahead of time that I could purchase and ignitor from my property management office, so I had that ready.
Paid $400–600Great priceWater heater repair
Margaret8 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 2 weeks ago★★★★★
Roberto was the team leader who rebuilt our water heater system. This included not just replacement of an old water heater but rebuilding the platform for it as well as a second adjacent water heater so that both are now correctly strapped and conform to SF earthquake safety code. This was an all day installation…
Paid $2,000+Great priceWater heater installation
Imy6 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 3 months ago★★★★★
FMP addressed several items on the Inspection Report. I am happy with the results & plan to call them again. Thank you to Sebastian, Oisin, & FMP team!
sfhogmanLocal Guide · 133 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 3 months ago★★★★★
I am a retired tradesman (not a plumber!) and I know quality work when I see it. These guys are good. From the prep work, through the installation and repair, to cleanup, they were very professional. I appreciated that they explained why and what they were doing as they went along.
Personable and professional...well done.
Paid $2,000+Reasonable priceToilet repair
Neal7 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 3 months ago★★★★★
This plumbing team were very thorough and methodical problem solvers, and they came equipped with all the right tools. They were more concerned with doing a complete, quality job than a rushed one.
Stephen9 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 3 months ago★★★★★
2nd time working with flow masters - specifically Alberto and Roberto on his team. First time on some routine maintenance on radiant heating system and water heater. This most recent fixing another radiant heating equipment issue and installing a leak detection system. Reliable and straightforward. They show up on…
Paid $2,000+OverpricedPlumbing leak detectionHeating system maintenance
Thank you for your kind words! We’re glad you appreciated our prompt service and clear explanations. We always aim to make sure our customers feel informed and well taken care of.
Niklas Nordlof1 reviewiTotal number of Google reviews Niklas has written across all businesses on Google Maps, not just this one.
Miguel and Daniel were great! They were very professional, and solved the issue with my broken ignitor on my hot water heater right away. Miguel even thought to mention ahead of time that I could purchase and ignitor from my property management office, so I had that ready.
Price assessment: Great price
Price: $400–600
Services: Water heater repair
Response from the owner · a week ago
Thank you for the great feedback! We’re glad Miguel and Daniel provided professional and prompt service to resolve your water heater ignitor issue. It’s wonderful to hear that Miguel’s helpful advice made the process easier. We appreciate your support!
Margaret O Wilson8 reviewsiTotal number of Google reviews Margaret has written across all businesses on Google Maps, not just this one.
Roberto was the team leader who rebuilt our water heater system. This included not just replacement of an old water heater but rebuilding the platform for it as well as a second adjacent water heater so that both are now correctly strapped and conform to SF earthquake safety code. This was an all day installation that required much attention to detail. We are very appreciative of Roberto and Jose & the excellent job done and strongly recommend Flow Masters for expertise and efficiency.
Price assessment: Great price
Price: $2,000+
Services: Water heater installation
Response from the owner · a week ago
Thank you for your thoughtful review and recommendation! We’re glad Roberto and Jose delivered excellent workmanship and attention to detail throughout your water heater replacement and platform rebuilding. Ensuring both water heaters were properly secured and met earthquake safety requirements was important, and we’re happy you’re pleased with the results. We truly appreciate your trust in our team!
Alma Esqueda2 reviewsiTotal number of Google reviews Alma has written across all businesses on Google Maps, not just this one.
Miguel and Daniel were super helpful. Explained the whole process before starting and explained the process of working it after installing it. Very respectful men !
Price assessment: Not sure
Services: Heating system repair
Response from the owner · 3 weeks ago
Thank you, Alma! We’re glad Miguel and Daniel took the time to explain everything clearly and made the installation process easy to understand. We truly appreciate your kind words about their respectful service!
Daphne Blumental3 reviewsiTotal number of Google reviews Daphne has written across all businesses on Google Maps, not just this one.
FlowMasters is THE BEST at what they do. Responsive, friendly, reasonably priced, and they've done fantastic work every time we've used them.
Services: Water heater installation, Plumbing leak detection, Faucet repair, Sump pump repair, Faucet installation, Sump pump installation, Service not listed
Response from the owner · a month ago
Thank you for the fantastic review! We’re thrilled to hear you’ve had consistently great experiences with our responsive service, friendly team, and fair pricing. We truly appreciate your continued trust!
Nate Goore2 reviewsiTotal number of Google reviews Nate has written across all businesses on Google Maps, not just this one.
Sebastian was a tremendous help in detecting a leak that was using 1,000 gallons of water a day. He solved it quickly and efficiently. We set up an appointment for next day repair. Great service overall!
Price assessment: Reasonable price
Services: Plumbing leak repair
Response from the owner · a month ago
Thank you for the great feedback! We’re glad Sebastian was able to quickly identify the leak and get everything moving toward a proper repair. We truly appreciate your kind words and are happy you had a great experience!
Jeff YoungLocal Guide · 21 reviewsiTotal number of Google reviews Jeff has written across all businesses on Google Maps, not just this one.
Enrique, Connor, and Sebastian did a great job on my unit in Dogpatch, replacing my shower faucet and garbage disposal.
Response from the owner · a month ago
Thank you, Jeff! We’re glad Enrique, Connor, and Sebastian did a great job replacing your shower faucet and garbage disposal. We appreciate your feedback and are happy you had a positive experience!
Jennifer S.Local Guide · 14 reviewsiTotal number of Google reviews Jennifer has written across all businesses on Google Maps, not just this one.
Fernado was absolutely AMAZING!! He was not only fast and efficient with the work that he did, but he got the job done with such a positive attitude. He was polite, courteous, cheerful, respectful, and very down-to-earth as well. I was really anxious about my issues with my bathroom sink, but Fernando literally erased all of my doubts and worries with his service and attention-to-detail attitude.
If anyone has a plumbing crisis in the Bay Area, please call Flow Masters Plumbing and request for Fernando if he's available. But I'm sure that the other plumbers are just as great as he is. Flow Masters Plumbing is also very fast in answering the phone. They make sure that each caller feels calm and comfortable with each conversation.
Once again, THANK YOU for your services!!!
Services: Drain cleaning
Response from the owner · 2 months ago
Thank you so much for your thoughtful review! We're thrilled to hear Fernando provided such outstanding service with your bathroom sink repair and helped put your mind at ease. We truly appreciate your kind words about Flow Masters Plumbing and our team, and we'll be sure to share your feedback with Fernando. Thanks again for your recommendation and for trusting us with your plumbing needs!
Mishika VoraLocal Guide · 6 reviewsiTotal number of Google reviews Mishika has written across all businesses on Google Maps, not just this one.
I called Flow Masters today for a service in San Francisco. They were able to quickly fix a utensil caught by a garbage disposal and diagnose any remaining disposal issues. They were courteous over the phone, quickly scheduled a same day appointment and were efficient providing a high quality service. Highly recommend!
Response from the owner · 2 months ago
Thank you so much for your kind review! We're so happy we could help and get everything taken care of the same day. We truly appreciate your recommendation and look forward to helping you again whenever you need us!
– Mantaya
Imy Y6 reviewsiTotal number of Google reviews Imy has written across all businesses on Google Maps, not just this one.
FMP addressed several items on the Inspection Report. I am happy with the results & plan to call them again. Thank you to Sebastian, Oisin, & FMP team!
Price assessment: Reasonable price
Price: $2,000+
Services: Toilet repair, Water heater installation
Response from the owner · 3 months ago
Thank you, Amy! We're so glad to hear you were happy with the results of the inspection report repairs. We'll be sure to pass your kind words along to Sebastian, Oisin, and the team. We appreciate your support and look forward to helping you again in the future!
