Open 24/7 · Emergency plumbing
Licensed C-36 #1115087 Martinez, CA · Contra Costa County apexplumbing@apexplumbingnorcal.com
Energy saving

Tankless Water Heater Service & Installation

Tankless water heaters give you hot water on demand without a tank that runs out. We install them, service them, and convert existing tank systems.

Navien tankless water heater installed on a wall with new copper and gas connections
Sound familiar?
  • Your family runs out of hot water with a tank heater
  • You want to reclaim the space a 50-gallon tank takes up
  • Your tankless unit shows an error code or needs its yearly flush

Tankless installation and conversion

Converting from a tank to tankless involves more than swapping the unit: the gas line often needs upsizing, the venting changes, and condensate drainage has to be handled on high-efficiency models. We do all of it, pull the permit, and leave you with a clean, code-compliant install like the ones in our photos.

Annual descaling and maintenance

Contra Costa County water is on the harder side, so mineral scale builds up inside a tankless heat exchanger. A yearly flush keeps the unit efficient and prevents the error codes and reduced flow that come from scale. We can set up a maintenance schedule so you don't have to think about it.

Repairs on all major brands

We diagnose and repair Navien, Rinnai, Rheem, Noritz and Bosch units — igniters, flow sensors, flame rods, fans and control boards — and we're honest about when a repair isn't worth it.

What's included

  • New tankless installs
  • Tank-to-tankless conversions
  • Gas line sizing & venting
  • Annual descaling / flush service
  • Error code diagnosis & repair
  • Navien, Rinnai, Rheem & more

Questions about tankless water heaters

How long do tankless water heaters last?

With yearly maintenance, 20 years or more — roughly twice the life of a tank heater.

Do I need a bigger gas line for tankless?

Often yes. Tankless units use a lot of gas while running. We check your existing line and meter capacity before recommending a unit.

Call (925) 226-8543Request This Service

Reviews

What our customers say on Google

Real reviews from homeowners across Contra Costa County. Every one is 5 stars.

5.0200+ five-star reviews on Google
What clients are saying on Google
Peter Kim
5 months ago

I had a fantastic experience with Apex Plumbing service. From the moment I called, they were responsive, professional, and easy to communicate with. The plumber arrived right on time, quickly diagnosed the issue, and explained everything clearly before getting started. It was determined that the root cause of the problem was a sewer backflow pipe issue, which falls under the responsibility of the HOA. Unfortunately, this led to sewage backing up into my garage and causing damage. The plumber handled the situation efficiently and with great attention to detail. They not only addressed the immediate issue but also ensured everything was clean and in proper working order before leaving. It’s clear they take pride in their work and genuinely care about customer satisfaction. While additional repairs such as drywall replacement, sanitation, and mold treatment are still needed, those are the responsibility of the HOA to address. I really appreciated their honesty and fair pricing—no surprises or unnecessary upselling. It’s such a relief to find a reliable plumber you can trust. I wouldn’t hesitate to recommend them to anyone in need of quality plumbing services! 

Posted on Google
Andrew Remley
5 months ago

Highly recommend! Nick did a really nice job and for the best price out of four quotes. Will be calling Apex first for my next plumbing project. 

Posted on Google
Kia Saedi
6 months ago

Nick and his team were just top notch. We had another national plumbing company quoted us $7K to fix a sub-pump issue, and Nick figured it out in like half an hour, no charge. I’m not kidding. He didn’t even accept a tip— said we should just use APEX again in the future if something needed fixing. Thank you Nick! 

Posted on Google
Mark Rosenberg
10 months ago

Apex plumbing is top notch. I highly recommend them for any plumbing needs you have. I had an issue with an exterior leak and Nick was able to meet me on time and diagnose and fix the issue. Call Nick he will take care of you.

Posted on Google
Erin Bennett
10 months ago

Highly Recommend! We had an outstanding experience with this plumbing company! Nick, the owner, came out to switch a toilet for us and was everything you hope for in a local professional—punctual, friendly, and very fair priced. He took the time to explain exactly why our old toilet wasn’t working properly and even offered helpful suggestions on a few DIY projects my not-so-handy spouse has going on. Nick was incredibly generous with his time, knowledge, and energy. It’s rare to find someone who goes above and beyond simply because they care about doing things right. We’ll absolutely be calling him for any future plumbing needs and recommending him to friends and neighbors. If you’re looking for a trustworthy, knowledgeable plumber, look no further!

Posted on Google
Elizabeth Baum
10 months ago

Not only did they send someone out right away but the 2 plumbers they sent out went out of their way to assess and take care of our problem, which happened to be a fork stuck in our washing machine drain. Boy did we have a good laugh about that. I would definitely call them again for any future plumbing issues and highly recommend their company.

Posted on Google
Call anytime, day or night

Need tankless water heaters help?

24/7 emergency service across Contra Costa County. Upfront pricing, licensed and insured.

(925) 226-8543
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Call (925) 226-8543 Request Service