What Are Tankless Water Heaters?

Unlike traditional water heaters that store and heat a large tank of water, tankless systems heat water on demand. Cold water passes through a heat exchanger, powered by gas or electricity, to deliver hot water instantly whenever you need it. That means no bulky storage tank, no standby heat loss, and no running out of hot water mid-shower.

Our licensed plumbers can install and service all major brands of tankless water heaters, including Rheem, Rinnai, Navien, Noritz, and Takagi, and we’ll help you choose the perfect system for your home and budget.

Why Upgrade to a Tankless Water Heater?

Lower Energy Costs - Tankless water heaters can be up to 34% more energy-efficient than traditional tanks, according to the U.S. Department of Energy. This is especially true for homes with lower daily water usage.
Longer Lifespan - With proper maintenance, tankless systems can last 20–30 years, nearly double the lifespan of a traditional water heater.
Compact Design - No more bulky tanks! Tankless systems mount neatly on a wall, saving valuable space in smaller Bay Area homes
Endless Hot Water - Tankless units heat water as it flows, providing an uninterrupted supply of hot water whenever you need it.

Tankless Water Heater Maintenance

Regular maintenance keeps your system efficient, safe, and long-lasting. Our professional maintenance services include:

We recommend annual service (or twice a year) if you have hard water or high water temperatures.

Why Choose Discount Plumbing for Your Water Heater Services?

We pride ourselves on helping homeowners make smart, lasting upgrades that save money and reduce waste.

What Our Customers Say About Us

Discount Plumbing San Francisco

5.0

Based on 477 reviews

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Austin Ellis

6 months ago

Ricardo and carlos repaired the flange on my toilet and solved a mystery drip sound. Great work.

Andrew MacLaggan

6 months ago

Ricardo was reliable, skilled, and friendly with our faucet installation.

Mike Sabes

7 months ago

Ricardo was thorough, professional and very helpful!

Mike Viviani

7 months ago

We had a water heater installed in 2014, but it failed today in 2026 and called Discount Plumbing. They sent a young man named Carlos, he installed a new water heater, a 50-gallon Bradford White brand, which looks better than the 40-gallon Rheem that he replaced. Carlos was smart, knowledgeable, and very polite. Ask for him if you can, he was wonderful. I was so impressed, I wrote his name on the side of the new water heater in case I need service down the road. I highly recommend Carlos he did a fantastic job!!

Dorothy Quincy

7 months ago

Elmer was a huge help, fixed my drain next day, and kept me updated throughout. I recommend!

Jenny Chu

7 months ago

Ryan and Silvano came early than our appointment time which was great for us! They came to snack our sink and fixed it very fast! They explained the steps and what they will do. They only took 30 minutes. Thank you!

Gina Silverman

8 months ago

Ricardo was so thorough and completely resolved our Plumbing crisis. He helped us understand what had happened and how we might avoid this particular problem in the future. He also took a look at some other areas we were having more minor issues and suggested some easy fixes. I appreciate that he was able to come by quickly and that he did a good job of cleaning up after the work. We have used him twice in the past and want to hesitate to call again in the future.

sbf_boyd

12 months ago

Discount Plumbing has completed three jobs for us in the past month and have been amazing at each one of them! We had a major sewage project completed in a timely manner due to tree root intrusion. From assessment to project completion, the crew provided great service and results. We also had two separate projects where Ryan C. helped move our water heater and replace our pilot when it went out. They are fast and professional, and scheduling the service was very easy. We will keep using Discount Plumbing in the future as our dedicated plumbers!

Debbie Theuer

12 months ago

We had a clogged outdoor P-trap drain pipe, and Carlos G quickly diagnosed the issue and recommended snaking the drain to clear it before the next heavy rainfall. He was professional, knowledgeable, and efficient. We were very satisfied with his service, and the drain is now flowing freely again. Discount Plumbing also gave a 1 month warranty on the snaking performed.

Ace Clemente

1 year ago

I live in Hawaii, and my mom who lives in San Francisco called me in a panic because her hot water suddenly stopped working. I reached out to Discount Plumbing, and they immediately sent Kevin to her home. He arrived promptly, assessed the issue with her water heater, and called me to clearly explain the possible solutions. Kevin kept me updated every step of the way, even sending me photos of the old unit so I could understand what was going on from across the ocean. Once I decided to move forward with a full replacement, he skillfully handled everything, picked up the new water heater, installed it quickly, and followed up with photos of the completed work. (I’ve posted the before and after photos) Before leaving, he left my mom his business card in case she needed anything else, which gave both of us peace of mind. The payment process was also seamless, they emailed me the invoice so I could take care of it directly, which was great because I didn’t want my mom to have to deal with any of it. I truly appreciate the professionalism, communication, and efficiency Kevin and Discount Plumbing showed throughout the entire process. Highly recommend them if you’re looking for dependable plumbing service in San Francisco!

Upgrade to Tankless Hot Water Today

Enjoy endless hot water, lower energy bills, and peace of mind.

Tankless Water Heater Installation and Repair in San Francisco

What Are Tankless Water Heaters?

Why Upgrade to a Tankless Water Heater?

Tankless Water Heater Maintenance

Why Choose Discount Plumbing for Your Water Heater Services?

What Our Customers Say About Us

Upgrade to Tankless Hot Water Today