The Best Gas Contractors in San Francisco, CA
We graded 8 companies on seven things customers actually report: satisfaction, reliability, workmanship, value, momentum, track record and how owners handle complaints.
From 45,465 Google reviews of 46 top-rated gas contractors nationwide; 8 of them in San Francisco, CA. Updated November 2, 2026.
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Best gas contractors in San Francisco for heating system maintenance
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Cabrillo Plumbing, Heating & AirHow Job match is calculatedBuilt only from reviews Google tagged “Heating system maintenance”:Stars on this job 55%4.97★Number of such jobs 25%36Overall Experts Score 20%92Job match= 94Stars are pulled toward the category average (4.85★) when a company has few tagged jobs, so 3 perfect reviews don’t beat 80 great ones. 4.3★ scores 0, 5.0★ scores full. Volume is compared with the busiest company for this job.94Job match = this company’s ★ on reviews Google tagged “Heating system maintenance” (shrunk toward the category average when there are few), how many such jobs it has done, and its overall Experts Score.
What customers said about heating system maintenance
Cabrillo Plumbing, Heating & AirWe had 2 toilets installed by Brian who did an excellent job for us. He was thorough and very attentive to our needs. We would most certainly want Brian to help us again We also had Tony do an inspection of our furnace. He was very professional and thorough.. We had Rob do our annual inspection and, as always, he…
Cabrillo Plumbing, Heating & AirThe service and professionalism were outstanding. Mathew, the technician, walked me through everything he was doing and why, and he had the issue fixed within 30 minutes. I’ll definitely be coming back here for any future heating or HVAC needs.
Cabrillo Plumbing, Heating & AirMatthew LeGaspi of Cabrillo did the furnace and water heater maintenance required, quickly and efficiently. And he’s a nice fellow. My wife Mitzi and I are very appreciative. Tom Donald
Cabrillo Plumbing, Heating & AirMatt did maintenance work on our gas furnace. He recommended that we replaced the water heater. Randy installed water heater. Both of them are quite professional and on-time.
Cabrillo Plumbing, Heating & AirI had a wall furnace cleaned and tested. Matt, the technician, was great in all regards!
Cabrillo Plumbing, Heating & AirRob was great! He was very informative and professional! My furnace is working fine.
Overall ratings
Experts Score 0–100Experts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. and a letter grade per factor (A = top 20% of gas contractors).
| # | Company | ScoreExperts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. | FactorsFactor grades, in orderSatisfaction (54%): Recency-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.Reliability (24%): How 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.Craft & service (0%): Google 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.Value (14%): Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Momentum (0%): Penalises 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.Replies to reviews (7%): How 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.One letter per factor score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = below 20. | ★Google star rating as shown on Google Maps. | Typical billMedian bill customers of this company reported in their reviews (needs 3+ priced reviews). |
|---|---|---|---|---|---|
| 1 |  Fast Response Plumbing & RooterSan Francisco, CA | A 94How 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%94+51.3Reliability 24%93+22.5Value 14%100+14.1Replies to reviews 7%87+6.2Craft & service penalty94−0.6Experts Score= 94Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAA | 4.94 | $264 |
| 2 |  1 Backflow PlumbingSan Francisco, CA | A 94How 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 59%96+56.3Reliability 26%91+23.7Value 15%93+14.2Craft & service penalty99−0.1Experts Score= 94Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAA– | 4.97 | $161 |
| 3 |  George Salet Plumbing, Inc.San Francisco, CA | A 94How 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%94+51.3Reliability 24%95+23Value 14%94+13.3Replies to reviews 7%86+6.1Experts Score= 94Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAA | 4.95 | $881 |
| 4 |  Advanced Plumbing & DrainSan Francisco, CA | A 92How 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%93+50.7Reliability 24%91+22.1Value 14%100+14.1Replies to reviews 7%71+5Craft & service penalty97−0.3Experts Score= 92Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAB | 4.94 | $305 |
| 5 | Cabrillo Plumbing, Heating & AirSan Francisco, CA | A 92How 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%92+50.2Reliability 24%92+22.3Value 14%100+14.1Replies to reviews 7%89+6.3Craft & service penalty94−0.6Experts Score= 92Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAA | 4.92 | $748 |
| 6 |  Heise's PlumbingSan Francisco, CA | A 83How 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%88+48Reliability 24%87+21.1Value 14%72+10.2Replies to reviews 7%61+4.3Craft & service penalty98−0.2Experts Score= 83Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAABAB | 4.88 | $406 |
| 7 |  Ace Plumbing & Rooter, Inc.San Francisco, CA | A 83How 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%86+46.9Reliability 24%84+20.4Value 14%90+12.7Replies to reviews 7%41+2.9Experts Score= 83Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAC | 4.89 | $529 |
| 8 |  Magic Plumbing Heating & CoolingSan Francisco, CA | B 71How 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%81+44.2Reliability 24%65+15.8Value 14%100+14.1Replies to reviews 7%34+2.4Craft & service penalty95−0.5Momentum penalty49−5.1Experts Score= 71Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | ABAACD | 4.86 | $767 |
What jobs cost
What customers paid, from the price Google asks reviewers to report.
| Job | Low25th percentile: 1 in 4 customers paid less than this. | TypicalMedian of the bill customers reported in their Google review (Google asks reviewers for a price range; we use the middle of each range). | High75th percentile: 1 in 4 customers paid more than this. | FairOf customers who rated the price, the share who chose “Great price” or “Reasonable” rather than “Overpriced”. |
|---|---|---|---|---|
| Drain cleaning | $57 | $239 | $393 | 97% |
| HVAC system maintenance | $26 | $78 | $251 | 98% |
| Toilet repair | $124 | $317 | $554 | 94% |
| Plumbing pipe repair | $251 | $506 | $1.4k | 96% |
| Water heater installation | $1.2k | $1.9k | $2.5k | 96% |
| A/C system maintenance | $26 | $83 | $322 | 96% |
| Plumbing leak detection | $57 | $248 | $506 | 93% |
| Faucet repair | $216 | $366 | $655 | 94% |
| Plumbing leak repair | $251 | $454 | $968 | 92% |
| HVAC system repair | $161 | $366 | $882 | 95% |
| Heating system maintenance | $19 | $57 | $195 | 99% |
| Water heater repair | $114 | $353 | $680 | 93% |
Gas Contractors in San Francisco, CA at a glance
How the 8 gas contractors we rated in San Francisco, CA compare, and what customers praise most.
Experts Score grades
A = score 80+, F = below 20.
- Grade A788%
- Grade B113%
- Grade C00%
- Grade D00%
- Grade F00%
Google ratings
Average stars per company.
- 4.90★ and up563%
- 4.80–4.89★338%
- 4.60–4.79★00%
- Below 4.60★00%
What customers praise
Share of Google review highlights.
- Quality7,51720%
- Professionalism8,93624%
- Responsiveness7,89621%
- Punctuality7,45420%
- Value5,18114%
Was the price fair?
All price verdicts left with reviews.
- Great price2,43230%
- Reasonable4,48555%
- Overpriced3755%
- Not sure86311%
Price verdicts by year
Share calling it great / reasonable / overpriced.
How we grade
Satisfaction (54%) — Recency-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.
Reliability (24%) — How 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.
Craft & service (penalty, up to −10) — Google 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.
Value (14%) — Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.
Momentum (penalty, up to −10) — Penalises 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.
Replies to reviews (7%) — How 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.