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Top-Rated Water heater repair or service pros in Castro Valley - Updated Nov 2026

Avatar for Water Heaters Masters
Water Heaters Masters
4.9(
110
)
Water Heater - Repair or Service

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2006

Free estimates

Emergency services offered

"Water Heater Masters were top-notch! I called on a Saturday afternoon - they were available 9am Sunday morning to come and inspect and quote. They only had one guy working that day, but scheduled me for Monday morning between 8 and 9. At 8:15am I got a call with an ETA of 8:45, which was a really nice touch! Despite telling me it would take an entire day to install, they were done by 1pm. They also found some creative ways to do the install to avoid drilling through my stucco (for the exhaust vent and for the condensate run-off). Very professional and clean-looking install. These guys may not always be the cheapest around, and they recommended a top-of-the-line heater (which is what I really wanted anyway), but I'd much rather pay a little extra for that level of service and support. Thank you!"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+20

Response time9 hrs
Recommended by95%of homeowners
Avatar for Accomplish Water Heater Service
Accomplish Water Heater Service
5.0(
14
)
Water Heater - Repair or Service

Serving Castro Valley, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2022

Free estimates

Emergency services offered

"Needed water heater replaced due to leakage. They arrived promptly the next morning and replaced the water heater and we had hot water that morning. The service man was professional and courteous. He took the time to answer questions I had. I highly recommend Accomplish Water Heater Service!"
My jobs
My jobs
My jobs
My jobs
My jobs

+1

Response time5 hrs
Response rate93%
Recommended by7%of homeowners
Avatar for All Water Heaters & Plumbing LLC
All Water Heaters & Plumbing LLC
4.4(
203
)
Water Heater - Repair or Service

Serving Castro Valley, CA and surrounding areas

Approved

Super Service Award Winner

In business since 1997

Free estimates

Emergency services offered

"Excellent customer service. I was impressed by their professionalism and attention to detail. They understood my needs and the urgency of my project -I placed a call to get an estimate, 5 hours later I had a brand new water heater installed."
Noritz Tankless
Noritz Tankless
Noritz Tankless
Rinnai Tankless
Rinnai Tankless

+20

Response time7 hrs
Response rate87%
140 neighbors recently requested a quote
Avatar for Albert Nahman Plumbing, Heating, and Cooling
Albert Nahman Plumbing, Heating, and Cooling
4.4(
722
)
Water Heater - Repair or Service

Serving Castro Valley, 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
Cost U Less Plumbing and Drain
4.8(
58
)
Water Heater - Repair or Service

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2014

Free estimates

Credit card accepted

"Tore down tile around bathtub and tiled, installed new faucets, and reinstalled shower doors. Everything looked professionally done and the area was clean after they were finished. After they finished I had them come back and grout kitchen counter and upgrade the hot water heater, which was also done well."
Recommended by96%of homeowners
Avatar for Super Brothers Plumbing Heating & Air
Super Brothers Plumbing Heating & Air
4.9(
9
)
Water Heater - Repair or Service

Serving Castro Valley, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2013

Free estimates

Emergency services offered

"Never had such a great experience with any contractor. So grateful to Eugene, Artem, Nick, and Alex not only for the great work they did, but for the care and attention they put in for 3 straight months. My house is built kind of complicatedly and the water heater isn't located in the most accessible place, but they were able to make it work. Not only that, but Eugene found me a new tankless water heater that would also work with my radiant floors - not only saving cost, but space as well. To say they went above and beyond is an understatement. They came back multiple times to make sure work was up to par - never half-assing anything. Really hoping I don't have any reason to need to reach out again soon, but if I do, I know who I'll be calling. Also, special shout out to Jeremy, Karen, and Kathy for their logistical help as well!"
Heat Pump Water heater installation
Rheem Heat Pump Water heater
AO SMITH HEAT PUMP WATER HEATER
sewer line ready to be installed
Sewer Line Project

+27

Response time3 hrs
Response rate100%
24 neighbors recently requested a quote
Avatar for Bell Brothers Plumbing Heating & Air - Hayward
Bell Brothers Plumbing Heating & Air - Hayward
4.3(
140
)
Water Heater - Repair or Service

Serving Castro Valley, CA and surrounding areas

Approved

In business since 1953

Free estimates

Warranties offered

"I called on Friday and Pierre came out on Saturday. He was very knowledgeable about replacing my wall heater that was very old. He also negotiated a discount on the full price which was great. He was very polite and scheduled the full service for Monday morning. Pierre replaced the furnace on Monday. I wasn't there, my brother was, but the heater works great and with a new thermostat on the wall. The company was great and so are their employees. I will definitely use them for my yearly maintenance of my new furnace and would recommend this company. Thank you so much for the fast response, professional work, and taking the old furnace away."
Before & After Furnace
Horizontal Install
Horizontal  Furnace Install
Techs
HVAC

+17

Response time6 hrs
Response rate91%
Recommended by90%of homeowners
Avatar for Costello's Plumbing
Costello's Plumbing
4.9(
18
)
Water Heater - Repair or Service

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2015

Free estimates

Emergency services offered

"I highly recommend the company (Costello's Plumbing) as well as the employee who helped us (Miguel). My wife spoke with Mr. Costello this morning, and booked an appointment for Miguel (one of his workers) to come over and look at the situation / prepare an estimate. He did so (arriving iwihin the appointment window), gave us a good quote, and indicated the two parts that needed replacement (the garbage disposal unit and the cold water dual shut-off valve. He indicated that we could purchase those parts through the company, or if I had the parts onhand, he could just install them (saving money). Fortunately, The Home Depot nearby was open, and I was able to get the two pieces fairly quickly. Miguel then: * installed the garbage disposal (and took care of getting rid of the old one), * connected the replacement shut-off valve, * replaced the faucet itself, and made sure that none of it leaked. A job well done!"
Response time3 hrs
Recommended by100%of homeowners
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FAQs for water heater repair or service projects in Castro Valley, 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 Castro Valley, 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.