Tankless Water Heater Installation | San Diego, CA
Fast, reliable tankless water heater installation. Upfront pricing, full code compliance, and we take care of your old unit!
- Upfront Pricing
- Fully Licensed
- Fast-Response
CA License #1145687
Why Install a Tankless Water Heater?
- Endless Hot Water — never run out mid-shower, even with multiple people or appliances running at once.
- Lower Energy Bills — heating only what you use can cut water heating costs significantly compared to a standard tank.
- Smaller Footprint — wall-mounted units free up floor and closet space compared to a bulky 40-50 gallon tank.
- Longer Lifespan — tankless units typically last 15-20 years, nearly double that of a traditional tank.
Our Tankless Water Heater Installation Process
- Site & Capacity Assessment: We evaluate your home’s peak hot water demand (GPM), existing gas line size, venting path, and electrical capacity to determine the right unit size and any infrastructure upgrades needed.
- Gas Line & Venting Upgrades: Most tankless conversions require upsizing the gas line and installing new venting per manufacturer specs — we handle this as part of the install rather than leaving you with a mismatched system.
- Mounting & Connection: We securely wall-mount the unit, connect water lines, and install a condensate drain line for condensing units to prevent water damage.
- Code-Compliant Installation: All work is completed to current San Diego County building codes, including:
- Isolation Valve Kit for future service and flushing.
- Proper venting (concentric or PVC, depending on unit type).
- Gas & Water Isolation Valves — new quarter-turn ball valves for emergency control.
- System Test & Calibration: We fire up the unit, test all gas connections for leaks, verify consistent flow rate and temperature output, and calibrate settings for safe, optimal performance.
Trusted Tankless Brands We Install
We install premium tankless units built for reliability and longevity, including Navien — our preferred brand for its condensing technology, build quality, and strong warranty coverage. We also work with other reputable manufacturers based on your home’s needs and budget such as:
- Navien (recommended)
- Noritz
- AO Smith
Schedule Your Water Heater Installation
Frequently Asked Questions
How long does tankless water heater installation take?
A first-time tankless installation typically takes 6 to 8 hours to account for gas line upsizing, new venting, and electrical requirements. Homes with existing tankless infrastructure may take less time.
Do I need a permit to install a tankless water heater in San Diego?
Yes. Local municipal codes require a permit and safety inspection to verify proper venting, gas line connections, and earthquake strapping. We handle the entire permitting process for you.
Is my home a good fit for tankless?
Most homes can be converted, but older homes may need gas line upsizing or electrical panel upgrades to support the new unit. We assess this during your free quote.
How much does tankless water heater installation cost?
Installation cost depends on unit size, whether gas line or venting upgrades are needed, and your home’s existing setup. Contact us for an accurate quote based on your specific installation.
What size tankless water heater do I need?
Sizing depends on your household’s peak simultaneous hot water demand — for example, running a shower and dishwasher at the same time. We calculate the correct flow rate (GPM) during your assessment to ensure the unit meets your household’s needs.
Schedule Your Water Heater Installation
Not Sure If Installation is For You? Explore Our Other Services:
Already Have a Tankless Unit That's Failing?
If your unit is showing error codes, inconsistent temperature, or is 15+ years old, visit our Tankless Water Heater Replacement page to explore your options.
Just Need a Repair?
If your unit is having an isolated issue and doesn’t need a full replacement, visit our Water Heater Repair page to schedule a fast diagnostic call.
Service Areas
Proudly Serving San Diego County & Surrounding Areas
Carlsbad | Oceanside | Vista | San Marcos | Escondido | Encinitas | Fallbrook | Bonsall | Del Mar | Solana Beach | Rancho Santa Fe | San Diego | Temecula | Murrieta | Menifee | Rancho Cucamonga
Schedule Water Heater Services with Alonso Plumbing Inc.
Looking for reliable water heater services in San Diego? Ready to upgrade to a tankless water heater or need repair services for your current unit? Ensure your home enjoys consistent and efficient hot water today. Contact Alonso Plumbing today for top-notch water heater services in San Diego, CA. Our team is ready to provide efficient, reliable solutions for your hot water needs.
Get A Fast & Easy Quote. Today!
