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Top-Rated Water heater repair or service pros in South Pasadena - Updated Nov 2026

Avatar for Western Rooter & Plumbing
Western Rooter & Plumbing
4.8(
172
)
Water Heater - Repair or Service

Serving South Pasadena, CA and surrounding areas

Approved

In business since 1981

Free estimates

Emergency services offered

"I had my tankless water heater serviced by Daniel W. Daniel was throughly professional during his entire visit. I would highly recommend Wester Rooter for all of your plumbing needs."
Ruben installs a new drainage system under a customers home. Working in a crawl space is rough, but we do what is needed.
Backing up? Got roots? Blast those roots out with a Hydro Jetter! We use a wart hog nozzle that combines controlled rotation with a unique 8 jet cutting configuration optimized for removing roots. It’s better with a jetter! Call us! We got this! ??
Sewer Line Camera
No drain clog too big or small, Western Rooter covers them all!
Justin clearing a Kitchen sink back-up after the Memorial holiday.
HALO 5 whole house water filtration system.

+542

Response time12 hrs
Response rate100%
10 neighbors recently requested a quote
Avatar for Leon Plumbing
Leon Plumbing
4.8(
79
)
Water Heater - Repair or Service

Serving South Pasadena, CA and surrounding areas

Approved

Super Service Award Winner

In business since 1983

Free estimates

Emergency services offered

"Leon Plumbing was able to repair our tankless water heater, where two other plumbing companies couldn't. Sev was awesome about pinpointing the problem and explaining in detail the solution. He even followed up a few days later to check in."
Tankless Installation (RUR199e with wifi)
Exterior Tankless Water Heater
Dual Tankless Water Heater Installation
Tankless water heater ACE PRO
Tankless Water Heater Service

+8

Response time8 hrs
Response rate94%
15 neighbors recently requested a quote
Avatar for G M C Plumbing, Inc.
G M C Plumbing, Inc.
4.9(
86
)
Water Heater - Repair or Service

Serving South Pasadena, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Emergency services offered

"Geremi and his team are excellent, very efficient and professional. They replaced my 75 Gal water heater, installed a pressure tank, and drain pan , a shut off valve and did water pressure adjustment and obtained a city permit. He provided itemized , reasonable task cost and explained well. I will definitely recommend him."
New Drainage
Old  shower Drainage
New kitchen faucet
New Drainage
New Drainage- SEWER LINE

+3

Response time5 hrs
Response rate97%
24 neighbors recently requested a quote
Avatar for HARMONY ELECTRIC PLUMBING & AIR INC
HARMONY ELECTRIC PLUMBING & AIR INC
4.8(
36
)
Water Heater - Repair or Service

Serving South Pasadena, CA and surrounding areas

Approved

In business since 2015

Free estimates

Emergency services offered

"They called us quickly and got a plumber out within a few days. Super thorough - tested all pipes and water sources to diagnose the problem. They were able to perform maintenance on most bathrooms the same day and improve the water temperature in our showers. Gave helpful, non-biased advice on potential further plumbing improvements. We will likely call this company again for any and all future plumbing needs."
826 neighbors recently requested a quote
Recommended by38%of homeowners
Avatar for L.A. Plumbing Pros
L.A. Plumbing Pros
4.7(
95
)
Water Heater - Repair or Service

Serving South Pasadena, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2005

Free estimates

Emergency services offered

"Victor from L.A. Plumbing Pros came out Jan. 28 to start my water heater. He was here within a half hour of his call. He gave me a ball park price over the phone for doing the job but told me when he got here he did not realize I was within a couple of blocks of the Altadena fire. He said there is no charge. He was very gracious and kind and I am so grateful to him. He got the water heater to work in just a couple of minutes. Thanks again Victor."
Remodel
Reroute irrigation valves
50 gallon water heater
Water pressure regulator
Remodel

+25

Response time3 hrs
Response rate95%
4 neighbors recently requested a quote
Avatar for So-Cal Plumbing & Rooter
So-Cal Plumbing & Rooter
4.7(
235
)
Water Heater - Repair or Service

Serving South Pasadena, CA and surrounding areas

Approved

Super Service Award Winner

In business since 1998

Free estimates

Emergency services offered

"Alex and Mauricio were on time, very polite and professional and did a fantastic job installing a tankless water heater. The service was excellent and I will certainly hire them again !"
One of our truckers
Our Jetter
Wotking hard for our clients
New Drainage Completed
New Clean-out Patch

+4

Response time4 hrs
Response rate95%
91 neighbors recently requested a quote
Avatar for Alliance United Rooter & Plumbing Inc.
Alliance United Rooter & Plumbing Inc.
4.9(
123
)
Water Heater - Repair or Service

Serving South Pasadena, CA and surrounding areas

Approved

In business since 2004

Free estimates

Credit card accepted

We take great pride in our experience, expertise, quality, and customer service that we provide. It is our mission to provide excellent workmanship and complete customer satisfaction from the start to completion of a project. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

drain under kitchen sink
drain under kitchen sink
drain under kitchen sink
drain under kitchen sink
drain under kitchen sink

+62

4 neighbors recently requested a quote
Recommended by98%of homeowners
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Showing 1-10 of 240
FAQs for water heater repair or service projects in South Pasadena, CA

Warning signs include fluctuating water temperatures, a pilot light that repeatedly goes out, unusual noises from the tank, or complete heating failure. You might also detect a rotten egg smell, indicating a potential gas leak, or notice water that never reaches the proper temperature. If your water heater is over eight years old and displaying these symptoms, the gas valve is a likely culprit. Professional inspection is recommended, especially if gas odors are present.

Water heater gas valves are not universally interchangeable. Each valve must match your specific water heater's make, model, and specifications. Important compatibility factors include gas type (natural gas vs. propane), BTU rating, connection types, and physical dimensions. Using an incorrect valve can result in poor performance, premature failure, or dangerous gas leaks. Always consult your water heater's documentation or a professional plumber to identify the appropriate replacement valve for your unit.

The South Pasadena, CA homeowners’ guide to water heater repair or services

From average costs to expert advice, get all the answers you need to get your job done.