ABOUT CALIFORNIA TANKLESS · TUSTIN CA
About California Tankless
A tankless-only water heater company serving Tustin and Orange County. We install, repair, and maintain Rinnai, Navien, Noritz, and Rheem systems — with a written quote and a city permit on every job.
We Only Do Tankless. That’s the Whole Point.
Most plumbing companies in Orange County list tankless water heaters somewhere between drain cleaning and toilet installs. We don’t do drains. We don’t do toilets. We install, repair, and maintain tankless water heaters in Tustin and the surrounding communities — and nothing else.
That focus matters because of where we work. Tustin’s water supply from MWDOC tests at 15 GPG — twice the US average — hard enough to strip the life out of an unserviced heat exchanger within three years. Old Town Tustin has 1920s galvanised pipes that need assessing before any gas work. Tustin Ranch homes built before 1995 have ½-inch gas lines that can’t run a tankless unit without an upgrade. These are Tustin-specific facts. We know them because this is the only thing we do, and we’ve been doing it in this city.
Every quote is written. Every permit is pulled. Every warranty is registered in your name. We answer the phone when you call at 6am with an error code — because we’ve built a business around being the people you call when there’s no hot water.
Our Focus
Tankless water heater installation, repair, and maintenance only. Not a general plumber with tankless on the service list. Every technician, every tool, every parts bin is specific to one product category.
Our Location
California Tankless
3002 Dow Ave
Tustin, CA 92780
Serving Tustin, Tustin Ranch, Old Town Tustin, Columbus Square, North Tustin, Villa Park, and surrounding Orange County communities.
Our Hours
Monday – Saturday: 7am – 7pm
Same-day service available in Tustin
Emergency shut-off guidance available by phone outside hours. Error code triage by phone free of charge.
Our Licence
California C-36 Licensed Plumbing Contractor
Authorised installer: Rinnai · Navien · Noritz · Rheem
Every installation includes a Tustin or OC Building Dept permit and a city inspector sign-off. We attend every inspection.
What We Stand For
We built this business around three frustrations Tustin homeowners told us they’d had with other contractors:
1. “The price changed after they started.” — We use itemised written quotes. The price on the quote is the price on the invoice. Gas line upgrade costs are included from the start, after we measure the gas line — not discovered mid-job.
2. “They didn’t pull a permit.” — Every water heater installation in California requires a permit. No exceptions. We pull it, we attend the inspection, we hand you the permit card. No shortcutting.
3. “They didn’t tell me about the OC hard water.” — Tustin’s 15 GPG water accumulates scale at twice the US average rate. We tell every customer this at installation, set a 12-month descaling reminder, and explain the efficiency impact of not maintaining the unit. This isn’t a sales pitch — it’s the reason most Tustin error codes happen.
About Us — Questions
About California Tankless
Where are you based and what areas do you serve?+
We are based at 3002 Dow Ave, Tustin CA 92780. We serve all of Tustin (92780, 92782, 92705) and Orange County — Orange, Irvine, Anaheim, Santa Ana, Yorba Linda, and surrounding cities. All OC cities we serve share the same MWDOC 15-19 GPG hard water supply. View our complete cost guide for pricing details.
Are you licensed and insured in California?+
Yes. California Tankless is C-36 licensed (Plumbing Contractor) and fully insured. We pull permits on every installation and attend the city inspector visit. We are authorized installers for Rinnai, Navien, Noritz, and Rheem.
Why do you specialise in tankless only?+
Tankless water heaters in OC hard water require a different maintenance approach than national guidelines suggest. 15-19 GPG MWDOC water accumulates scale at twice the national rate. We built this business around one thing so every training hour, every tool, and every parts bin is specific to tankless in OC conditions. Learn more through our master FAQ hub.
Call Us — Free Assessment, Written Quote
We assess your home on-site, give you a written quote, and let you decide. No commitment to call. No charge for the assessment.