TUSTIN CA · ORANGE COUNTY · C-36 LICENSED · TANKLESS ONLY
#1 Tankless Water Heater
Specialists in Tustin, CA
Serving Tustin Ranch · Old Town Tustin · Columbus Square · North Tustin. Written quote. Permit every job. 15 GPG OC hard water expertise.
AUTHORISED INSTALLER & SERVICE PARTNER
ACT NOW · MWDOC · 15–19 GPG · OC HARD WATER
Your Tankless Is Accumulating Scale Right Now
Tustin’s MWDOC water tests at 15–19 GPG — twice the national average. Scale builds on your heat exchanger at 2× the rate. Navien E003 and Rinnai Code 12 appear by year 2–3 without annual service. Most units in Tustin have never been descaled.
- ✓Tankless-only — not a generalist with tankless on the list
- ✓Gas line measured at assessment — no mid-job surprise
- ✓Written itemised quote — price on quote = price on invoice
- ✓Permit pulled on every installation — city inspector attends
- ✓Warranty registered in your name, not the company’s
- ✓12-month descaling reminder set at every installation
15–19 GPG
Tustin water hardness — 2× US average
WHAT WE DO
Tankless Water Heater Services
Tustin CA — Installation, Repair & Annual Maintenance
C-36 Licensed. Written quote before any work. Permit on every installation.
Same-Day Repair
Error code or no hot water? Parts on every vehicle. Resolved same visit.
Learn More →Installation
All brands. Gas line assessed upfront. Permit on every job.
Learn More →Tank-to-Tankless
Gas line assessment included. SoCalGas rebate up to $1,300.
Learn More →Annual Descaling
15 GPG OC water = 12-month interval. We set the reminder.
Learn More →Recirculation Pump
End the 40-second wait in Tustin Ranch master baths.
Learn More →Gas Line Upgrade
Pre-1995 homes: ½→¾ inch. Always in the quote upfront.
Learn More →WHY CALIFORNIA TANKLESS
Tustin’s Only
Tankless-Only Specialists
Most plumbers list tankless as one of thirty services. We built this business around one thing — and we built it in Tustin, for Tustin’s 15 GPG hard water.
Written Quote — Always
We measure your gas line at the assessment and include every cost in writing before any work begins. Price on the quote is price on the invoice. No exceptions.
Permit on Every Installation
California requires a permit for every water heater installation. We pull it, attend the city inspector visit, and hand you the documentation. Every single job.
15 GPG Hard Water Expertise
Tustin’s MWDOC water is twice the national average hardness. We calibrate every recommendation, every service interval, and every unit choice to OC conditions.
Warranty in Your Name
We register every unit warranty in the homeowner’s name — not ours — and set the 12-month annual descaling reminder before we leave.
15–19 GPG
OC water hardness
2× US average
$3.2K–$5.5K
All-in Tustin install
2026 range
Up to $1,300
SoCalGas rebate
qualifying models
12 Months
OC descaling interval
annual service
HOW WE WORK
Our Proven 6-Step Process
Phone Triage
You call, we answer. Real person, real knowledge. Error code, brand, situation — we tell you honestly what to expect.
On-Site Assessment
We measure your gas line, plan the vent route, assess your home. Answers grounded in your specific Tustin home, not national averages.
Written Quote
Itemised quote before any work. Gas line upgrade always included upfront if needed. Price on quote = price on invoice.
Permit + Installation
We pull the permit, complete the work, attend the city inspector visit. Most Tustin installs done in 4–8 hours.
Hot Water Confirmed
Full draw cycle before we leave. You confirm hot water at the fixture. We don’t call it done until you do.
Warranty + Reminder
Warranty registered in your name. 12-month descaling reminder set — because OC’s 15 GPG water demands it.
WHAT TUSTIN HOMEOWNERS SAY
Real Reviews from Real Jobs
★★★★★
“Quoted $1,800 for replacement. They fixed it for $285. Eight years of Tustin hard water, heat exchanger packed with scale. They showed me before cleaning it. Fixed same morning.”
— Marcus T.
Columbus Square, Tustin 92782
Navien E003 · Descaling · Same Day
★★★★★
“They measured the gas line before quoting. The other two companies hadn’t. Total came in at $4,050. After the SoCalGas rebate we were at $2,750. No surprises. That’s all I wanted.”
— David R.
Tustin Ranch, 92782
Rinnai RU199iN · Gas Line Upgrade · 2026
★★★★★
“My 1931 Craftsman on El Camino Real. They found a vent route through the utility room — no original plaster touched. Navien running 8 months now, no issues.”
— Janet M.
Old Town Tustin, 92780
Navien NPE-180A2 · Historic Home · No Surface Cuts
REAL JOBS · REAL TUSTIN HOMES
Case Studies — What the Work Looks Like
AREAS WE SERVE
Tustin Neighbourhoods & Orange County
Same MWDOC 15–19 GPG water across all OC. Same written quote approach. Same C-36 Licensed service.
Tustin Ranch
ZIP 92782
Primary area. 1988–2002 builds. Navien NPE-240A2 most common install. Gas line assessment every job.
Area Guide →Old Town Tustin
ZIP 92780
1920s–1950s Craftsman. Zero surface cuts. Galvanised pipe expertise. Complex venting handled.
Area Guide →Columbus Square
ZIP 92782
MCAS Tustin 2005–2012 builds hitting the service window now. Annual descaling recommended.
Area Guide →North Tustin
ZIP 92705
Cowan Heights & Lemon Heights. Estate homes. OC Building Dept permits on every job.
Area Guide →Villa Park
ZIP OC
Highest HHI in service area. Noritz EZ stainless top recommendation — 25-year HX warranty.
Area Guide →Orange · Irvine · Anaheim · More
ZIP All OC
All OC cities share the same MWDOC 15 GPG supply. Same written quote, same OC expertise.
Area Guide →FREQUENTLY ASKED
Tustin CA Tankless FAQ
Real questions from Tustin homeowners. Straight answers.
WE’RE IN TUSTIN — CALL US NOW
Same-Day Service.
Written Quote Before We Start.
Free on-site assessment. Permit on every job. Hot water confirmed before we leave. No upsell. No surprises. That’s the guarantee.
3002 Dow Ave, Tustin CA 92780 · Mon–Sat 7am–7pm · C-36 Licensed
Tustin’s Tankless Specialists — Same-Day Service Available