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  • Verified reviews icon251
    Verified water heater services reviews

Top-Rated Water heater pros in Cupertino - Updated Nov 2026

Avatar for Water Heaters Masters
Water Heaters Masters
4.9(
112
)
Tankless Water Heater - InstallTankless Water Heater - Install - For BusinessTankless Water Heater - Repair+5 more

Serving Cupertino, 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
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+20

Response time9 hrs
Recommended by94%of homeowners
Avatar for Better Water Heaters
Better Water Heaters
4.5(
195
)
Tankless Water Heater - InstallTankless Water Heater - RepairWater Heater - Install or Replace+1 more

Serving Cupertino, CA and surrounding areas

Approved

In business since 2001

Free estimates

Emergency services offered

"Call in the morning, visit that afternoon with quote, installation next day. They didn't have our model in stock, so we got an upgrade to the next larger water heater at no additional cost. Installer was very knowledgable and friendly."
Additional Photos
Additional Photos
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1 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Fantastic Rooter, Inc.
Fantastic Rooter, Inc.
4.5(
174
)
Tankless Water Heater - InstallTankless Water Heater - Install - For BusinessTankless Water Heater - Repair+5 more

Serving Cupertino, CA and surrounding areas

Approved

In business since 2007

Free estimates

Emergency services offered

"We hired Fantastic Rooter to re-pipe my mother-in-law's house. They did a fantastic job - even the city inspector was praising Gerardo and his crew for their work. She also needed a new water heater and sink, and those were reasonable priced. The guy that replaced the sheetrock did a great job. You can't even tell the walls were ever cut into, he made them so smooth again. And they cleaned up well, too. I highly recommend them!"
Outdoor Tankless w H
Before a Tankless install
After a Tankless install
Indoor Tankless & Repipe
Indoor Tankless W H

+1

Response time2 days
Recommended by96%of homeowners
Avatar for Chandler's Plumbing
Chandler's Plumbing
4.3(
746
)
Water Heater - Install or ReplaceWater Heater - Repair or ServiceTankless Water Heater - Install+5 more

Serving Cupertino, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2001

Free estimates

Emergency services offered

"Called Chandlerâ s Plumbing came out in two hours after calling them. Removed the old water heater and replaced it with a brand new water heater. Was great to get it done so fast and have hot water again in my house. Would recommend this company to anyone looking to have plumbing work done."
Sewer Line Camera Inspection
Shut-Off Valve Repair
Main Water Line Replacment
Water Heater Installation
Tankless Water Heater Installation

+310

Response time4 hrs
268 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for The Tankless Guys Plumbing Corp.
The Tankless Guys Plumbing Corp.
5.0(
13
)
Tankless Water Heater - InstallTankless Water Heater - RepairWater Heater - Install or Replace+1 more

Serving Cupertino, CA and surrounding areas

Approved

In business since 2021

Free estimates

Emergency services offered

"Exceptional Service from The Tankless Guys I recently had the pleasure of hiring The Tankless Guys for a water heater replacement, and I am thrilled with the exceptional service they provided. From start to finish, this plumbing company demonstrated professionalism, efficiency, and a commitment to customer satisfaction. First and foremost, their pricing was incredibly reasonable compared to other quotes I received. The Tankless Guys understand the importance of offering competitive rates without compromising on the quality of their work. This affordability was a significant factor in my decision to choose them for my plumbing needs. What sets The Tankless Guys apart is the personal involvement of the owners. It was evident that they take pride in their business and genuinely care about their customers. This hands-on approach ensures that every job is handled with attention to detail and a commitment to excellence. It's reassuring to know that the owners are actively engaged in over"
Give us a call today at 408-580-0031
Give us a call
give us a call
give us a call
give us a call

+5

Response time7 hrs
Response rate91%
Recommended by100%of homeowners
Avatar for Durrani Plumbing
Durrani Plumbing
4.9(
15
)
Water Heater - Install or ReplaceWater Heater - Repair or Service

Serving Cupertino, CA and surrounding areas

Approved

In business since 2023

Free estimates

Credit card accepted

"The work completed by Sarfraz at Durrani Plumbing exceeded my expectations! I had a hot water heater replaced and the job was well done. The quote was fair, accurate, and Sarfraz explained everything thoroughly. I really appreciated knowing all of my options to have the job done correctly. I would hire Durrani Plumbing again for any needs I have in the future."
American Standard Faucet
Insinkerator Garbage Disposal
Bradford White Water Heater
Bradford White Water Heater
75 Gallon Water Heaters

+9

Response time3 hrs
Response rate96%
Recommended by100%of homeowners
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Water Heaters FAQs, answered by experts

Most standard residential water heaters, which are typically around 40 gallons and use 240 volts and between 3,500 and 5,500 watts, require a 30-amp, two-pole circuit breaker. For smaller, point-of-use water heaters using 120 volts and between 1,500 and 3,000 watts, a 30-amp breaker is also often adequate. However, some models may have different needs; units that use more watts than average may require a 40-amp breaker, while smaller units might only need a 20-amp breaker. Newer, tankless, or more energy-efficient models can also require a higher amperage. Having the correct breaker size is crucial for safe and efficient operation, so it's best to consult a licensed electrician to determine the specific needs of your water heater.

The size needed for your expansion tank is determined by the size of your home's water heater. Expansion tanks are available in 2-gallon and 4.5-gallon sizes. A 2-gallon tank will be appropriate for water heaters up to 50 gallons. An adequately sized tank should have a volume that equals 2% to 5% of the water volume within the system. A plumber can evaluate your home's water pressure, water heater size, and other factors to provide suggestions for picking out the best expansion tank.

Several signs indicate your water heater may be failing or in need of replacement. Key indicators include:

  • Age: A water heater older than ten years is approaching the end of its typical lifespan.

  • Water Quality: If you notice rusty or discolored water from your hot water faucets, or a foul odor similar to rotten eggs or sulfur, it can signal internal corrosion.

  • Unusual Noises: Banging, rumbling, or popping sounds from the tank often mean sediment has built up, causing the unit to overheat.

  • Leaks: Any water pooling around the base of the tank or visible leaks are clear signs of failure.

  • Performance Issues: A decline in performance, such as water not getting hot enough, taking longer to heat up, low water pressure, or decreased efficiency, suggests the unit is struggling.

  • Visible Damage: Obvious rust and corrosion on the exterior of the tank can indicate a more serious internal problem.

While these signs often point to replacement, some issues may be fixable. It's best to consult a professional plumber to diagnose the problem before investing in a new unit.

While not all homes require a hot water heater expansion tank, they are necessary in most newer homes and are often mandated by local building codes. Codes typically require an expansion tank if your plumbing system is a 'closed-loop' system, which often includes a backflow preventer or pressure regulator on the main water line. Some municipalities have specific requirements. Installing an expansion tank on a closed system is crucial, as it prevents excess pressure that can damage your water heater and other appliances, potentially shortening their lifespan. However, tankless water heaters do not require an expansion tank.

Basements, specifically those without any air conditioning, are the best location for a hybrid water heater. These rooms are less likely to experience extreme temperature fluctuations, which can affect your hybrid water heater’s efficiency and performance. Basements often have more than enough space for their tanks and proper air circulation. Hybrid water heaters can also be a bit noisy, but putting them in your basement will keep the noise away from your main living areas.

The Cupertino, CA homeowners’ guide to water heater services

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