Tankless Water Heater Replacement in San Diego
Fast, reliable tankless water heater replacement. Upfront pricing, full code compliance, and we take care of your old unit!
- Upfront Pricing
- Fully Licensed
- Fast-Response
CA License #1145687
Signs Your Tankless Water Heater Needs Replacement
- Heat Exchanger Scale Damage: San Diego County’s hard water causes mineral scale to build up inside the heat exchanger; once scaling causes cracking or overheating damage, the unit needs replacement rather than another descaling.
- Error Codes That Persist After Service: Recurring error codes even after a technician has flushed and inspected the unit point to a failing heat exchanger or control board, not a maintenance issue.
- Age (15–20 Years): Tankless units are built to outlast tank heaters by years, but at this age, replacement parts become scarce and repair costs approach the price of a new install.
- Inconsistent Water Temperature: Fluctuating output that doesn’t resolve with descaling signals worn internal components nearing failure.
- Rising Energy Bills Without Rising Usage: Scale buildup forces the unit to work harder for the same hot water output, driving up gas or electric costs as efficiency drops.
Our Tankless Water Heater Replacement Process
- Sizing & Fuel Source Assessment: We calculate the correct flow rate (GPM) for your household’s simultaneous hot water demand and confirm your gas line size or electrical capacity can support the new unit, upsizing gas lines when needed.
- Safe Disconnection & Drain: We shut off gas/electric and water supply lines, drain the old unit, and disconnect the venting and gas connections.
- Old Unit Haul-Away: We remove and haul away your old tankless unit for proper recycling at no extra hassle to you. This is included in your upfront pricing so no worries about hidden fees!
- Code-Compliant Installation: We install your new high-efficiency tankless unit according to current San Diego County building codes, including:
- Proper venting per manufacturer specs (concentric or PVC, depending on unit type).
- Isolation Valve Kit: Dedicated service valves for easy future flushing and maintenance.
- Condensate Drain Line: Properly routed for condensing units to prevent water damage.
- Gas & Water Isolation Valves: New quarter-turn ball valves for easy emergency control.
- System Test & Calibration: We fire up the unit, test gas lines for leaks, check water flow and temperature output, and calibrate settings for safe, optimal hot water delivery.
Tankless Water Heater Brands We Install
- Navien
- Noritz
- AO Smith
Schedule Your Water Heater Replacement
Frequently Asked Questions
How much does tankless water heater replacement cost in San Diego?
Tankless water heater replacement typically runs higher than a traditional tank due to unit cost and installation requirements like venting and gas line upgrades. Pricing varies based on your home’s setup — contact us for an accurate quote based on your specific installation.
How long does tankless water heater replacement take?
A straight tankless-to-tankless swap usually takes our licensed plumbers 3 to 5 hours. If you’re converting from a traditional tank for the first time, expect 6 to 8 hours to account for new venting, gas line upsizing, and electrical requirements.
Do I need a permit to replace a tankless water heater in San Diego?
Yes. Local municipal codes require a permit and safety inspection for water heater replacements to verify proper venting, gas line connections, and earthquake strapping. We handle the process for you.
Can I replace a tank water heater with a tankless unit?
Yes. Converting from a tank to tankless requires upgrading your gas line size or electrical capacity, installing proper venting, and adding a condensate drain for condensing units. Our team assesses your home’s setup and handles the full conversion, including any code-required upgrades.
How long do tankless water heaters last?
A well-maintained tankless water heater typically lasts 15 to 20 years — nearly double the lifespan of a traditional tank unit. Actual lifespan depends on water quality and how consistently the unit is flushed and maintained.
Do tankless water heaters need maintenance to avoid failure?
Yes. San Diego’s hard water causes mineral scale to build up inside the heat exchanger over time, which can lead to reduced efficiency and premature failure. Annual flushing and inspection prevents scale damage and extends the life of your unit. Learn more on our Water Heater Maintenance page.
Why choose Alonso Plumbing Inc. for your tankless water heater needs?
Alonso Plumbing is a licensed (CA C-36) plumbing contractor serving San Diego County who specializes in tankless water heater installation, repair, and maintenance. Our commitment to code-compliant work and customer satisfaction makes us the trusted choice for your tankless water heater project.
Schedule Your Water Heater Maintenance
Not Sure If You Need a Full Replacement? Explore Our Other Services:
Looking for Water Heater Repair Instead?
If your unit is under 15 years old, isn’t showing a cracked heat exchanger, and just needs a component fix or descaling, visit our Water Heater Repair Service page to schedule a fast diagnostic call.
Interested in Annual Water Heater Maintenance?
Prevent mineral buildup and extend the lifespan of your current unit with a professional flush and inspection. Learn more on our Water Heater Maintenance page.
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? 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.
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