Keep Your Tankless Water Heater Running at Peak Performance
Regular maintenance is essential to keep your tankless water heater operating efficiently and extend its lifespan. Our comprehensive service includes flushing and descaling to remove mineral buildup, cleaning or replacing water and air filters, inspecting venting and combustion safety for gas models, checking for leaks and worn parts, testing system performance, and providing tips to maximize efficiency.
Why Annual Tankless Water Heater Maintenance Matters
A tankless water heater is a precision appliance. Inside that compact wall-mounted unit, water flows through a heat exchanger where it’s heated to your desired temperature in seconds. The heat exchanger is the heart of the system — and the primary target of mineral scale buildup from your home’s water supply.
Over time, calcium and magnesium in your water coat the heat exchanger’s internal passages. This scale acts as insulation, forcing the unit to work harder to heat the same amount of water. Left unchecked, it reduces efficiency, causes temperature fluctuations, triggers error codes, and eventually damages the heat exchanger itself — the most expensive component in the system.
Regular maintenance prevents all of this.
What Our Tankless Water Heater Maintenance Service Includes
Every maintenance visit follows a comprehensive checklist developed from manufacturer recommendations and years of field experience.
System inspection — Before touching anything, the technician reviews the unit’s error log, checks for visible issues, and tests baseline hot water output. This establishes what the system is doing before and after service.
Flushing and descaling — The technician connects a submersible pump to the unit’s isolation valves and circulates food-grade white vinegar through the heat exchanger for 45 to 60 minutes. This dissolves calcium, lime, and mineral deposits without damaging the system.
Filter service — Inlet water filters trap sediment before it enters the unit. Combustion air filters protect the gas burner. Both are cleaned or replaced during every maintenance visit.
Venting and combustion safety — For gas models, the technician inspects the concentric PVC venting for blockages, checks condensate drainage, and verifies combustion air supply.
Performance verification — After service, the technician tests hot water at multiple fixtures to confirm consistent temperature and adequate flow rate.
Hard Water and Your Tankless Unit
Water hardness is measured in grains per gallon (gpg). Here’s how it affects your maintenance schedule:
- Soft water (0-3 gpg) — Annual flushing is sufficient
- Moderately hard water (3-10 gpg) — Annual flushing recommended
- Hard water (10-17 gpg) — Flush every 6 months
- Very hard water (17+ gpg) — Flush every 6 months and consider a water softener
Many areas we serve — including Tampa, Houston, and the Inland Empire — have water hardness well above 10 gpg. Our technician can test your water hardness during the maintenance visit and recommend the right schedule for your home.
Tankless Maintenance Service Areas
We provide professional tankless water heater maintenance in Orlando, Fort Lauderdale, Jacksonville, Austin, Denver, and San Jose — in addition to the areas listed above.
Need a detailed checklist you can reference? Our annual maintenance checklist covers every step.
Protect Your Tankless Investment With Annual Maintenance
Your tankless water heater is a $3,000 to $9,000 investment designed to last 20+ years. Annual maintenance costing $150 to $250 is a small price to protect that investment, maintain peak efficiency, and keep your manufacturer warranty active. If you notice any issues between service visits, our repair team is available for prompt diagnosis. Schedule your maintenance today.
How It Works
Schedule Service
Book your annual maintenance online or by phone. We'll match you with a vetted local plumber who specializes in your brand and model.
Comprehensive Inspection
The technician inspects the entire system — venting, gas connections, water lines, condensate drainage, and electrical components. They check the error log for any intermittent issues.
Flush & Descale
Using food-grade white vinegar and a submersible pump kit, the technician circulates descaling solution through the heat exchanger for 45 to 60 minutes to dissolve mineral scale.
Filter & Component Service
Inlet water filters and combustion air filters are cleaned or replaced. The flame rod is cleaned, condensate trap is cleared, and all connections are checked for tightness.
Performance Verification
The technician tests hot water output at multiple fixtures, verifies consistent temperature, and confirms the system is operating at manufacturer specifications.
Why Choose Total Tankless
Maintenance Specialists
Our plumbers perform tankless maintenance every day, not as a side service. They know the manufacturer-recommended procedures for every brand.
Warranty Protection
Most manufacturers require annual professional maintenance to keep your warranty valid. We document every service for your records.
Honest Recommendations
If your water is soft and your unit is running well, we'll tell you to come back next year. We don't upsell unnecessary services.
Our Work
What Our Customers Say
"Been getting annual maintenance through Total Tankless for two years now. The flushing service keeps our Navien running like new. Their plumber even caught a slow leak we didn't know about."
Frequently Asked Questions
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