Tankless Water Heater Maintenance Littleton CO is the annual service that clears scale, checks safety controls, and restores full flow to your unit. If your shower runs cold or the heater cycles on and off, hard water has likely coated the heat exchanger. We handle tankless water heater service Littleton CO homeowners schedule every year, from Ken Caryl to Downtown Littleton. One visit now prevents a mid-winter breakdown.
Tankless Water Heater Maintenance Littleton CO is a scheduled service that descales the heat exchanger, flushes mineral buildup, and tests every safety and ignition component on your unit. We connect a descaling pump with a food-grade descaler, circulate solution through the water path for 30 to 45 minutes, then flush with clean water. After that, we pull the inlet filter, inspect the gas valve, test the igniter, and verify the pressure relief valve opens at the correct setting. Most visits take 90 minutes to two hours.
Littleton's water runs hard. That means scale builds inside your heat exchanger faster than in softer-water cities, and a tankless unit that goes two or three years without service can lose 20 to 30 percent of its flow capacity. Homeowners in Ken Caryl and Bow Mar often call us when their shower pressure drops or the unit throws an error code. Scheduling annual tankless water heater maintenance Littleton CO residents trust keeps the warranty valid and avoids a $600 to $1,200 heat exchanger replacement.
Our standard tankless maintenance visit covers everything the manufacturer recommends for annual service. If we find a worn part during inspection, we quote the replacement before we install it. You get a written report at the end of every visit.
We connect a descaling pump and circulate a food-grade descaler through the heat exchanger for 30 to 45 minutes. This breaks down calcium and magnesium scale that restricts flow and reduces efficiency. We flush with clean water until the runoff is clear.
The inlet filter catches debris before it reaches the heat exchanger. We pull it, clean it, and check for damage. A clogged filter is one of the most common causes of reduced flow and error codes on tankless units.
We test the igniter and inspect the flame rod for carbon buildup. If the igniter is weak or the flame rod is corroded, the unit may fail to fire or shut down mid-cycle. We clean or replace these parts as needed.
We test the thermostat and thermistor with a multimeter to verify they are reading accurately. A faulty thermistor can cause inconsistent water temperature or prevent the unit from firing at all. We replace it if the readings are out of spec.
The pressure relief valve is a safety device. We verify it opens at the correct pressure and reseats properly. If it leaks or fails to open, we replace it. We also check the expansion tank if your system has one.
We inspect the gas valve for corrosion or debris and check the venting for blockages. Proper venting is critical for safe operation. If we find an issue, we explain what needs to be done and quote the repair.
We start by recording the unit's error codes, inlet and outlet water temperatures, and gas pressure with a pressure gauge. We check the pressure relief valve and inspect the venting for blockages. This takes about 15 minutes and tells us what the unit has been doing since the last service.
We isolate the unit, connect a descaling pump to the service valves, and circulate a food-grade descaler through the heat exchanger for 30 to 45 minutes. The solution breaks down calcium and magnesium scale. We then flush with clean water until the runoff runs clear.
With the unit open, we pull the inlet filter and clean it, inspect the igniter and flame rod, test the thermistor and thermostat with a multimeter, and check the gas valve for corrosion. If we find a worn part, we show you and quote the replacement before we touch it.
We put the unit back together, restore water and gas, and fire it up. We run hot water at multiple fixtures to confirm the unit modulates correctly and holds temperature. We check for leaks at every connection and verify the pressure relief valve reseats properly.
Before we leave, we log the date, descaler used, parts inspected, and any recommendations for next year. You get a copy by email. If your unit is still under warranty, this record is what the manufacturer asks for when you file a claim.
We start by recording the unit's error codes, inlet and outlet water temperatures, and gas pressure with a pressure gauge. We check the pressure relief valve and inspect the venting for blockages. This takes about 15 minutes and tells us what the unit has been doing since the last service.
Circulates food-grade descaler through the heat exchanger to dissolve calcium and magnesium scale. We use a dedicated pump for tankless service.
Tests thermistors, thermostats, and heating elements for correct resistance and voltage. This tells us if a component is failing.
Checks gas pressure at the inlet and water pressure at the unit. Correct pressure is critical for safe and efficient operation.
Lets us look inside the heat exchanger and venting without disassembling the entire unit. We use it to check for scale, corrosion, or blockages.
Used when we need to replace a section of pipe or a fitting during a repair. We sweat copper joints to code.
For loosening and tightening gas and water connections. We use it when replacing valves, filters, or fittings.
A homeowner in Ken Caryl had a Navien tankless unit that had not been serviced in three years. The shower pressure had dropped significantly, and the unit was throwing an error code. The heat exchanger was heavily scaled.
After: We descaled the heat exchanger with a food-grade solution, replaced the inlet filter, and tested all components. The error code cleared, and the flow rate returned to the original specification. The homeowner noticed full pressure immediately.
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A Rinnai unit in Bow Mar was cycling on and off, causing inconsistent water temperature. The homeowner had to wait for hot water and sometimes got cold spells mid-shower. The thermistor was reading incorrectly.
After: We tested the thermistor with a multimeter and confirmed it was out of spec. We replaced it and verified the unit held temperature through a full heating cycle. The homeowner no longer experiences cold spells.
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A Bosch tankless unit in Historic Downtown Littleton would not fire. The igniter was weak, and the flame rod was covered in carbon. The homeowner had no hot water for two days.
After: We replaced the igniter, cleaned the flame rod, and tested the unit. It fired reliably and produced hot water at the correct temperature. The homeowner had hot water back the same day.
Book this service →Most tankless failures start small. A little scale here, a worn igniter there. Annual maintenance catches these issues early. Here are the problems we see most often in Littleton and how we fix them.
Ask a pro →We descale the heat exchanger with a food-grade descaler and flush the system until the runoff is clear. This restores full flow and efficiency. We recommend annual service to prevent scale from returning.
We pull the inlet filter, clean it, and check for damage. If the filter is degraded, we replace it. We also check the water pressure to make sure the filter is not clogging due to a larger issue.
We test the igniter and inspect the flame rod for carbon buildup. If the igniter is weak or the flame rod is corroded, we replace it. We verify the unit fires reliably through a full heating cycle.
We test the thermistor and thermostat with a multimeter. If the readings are out of spec, we replace the faulty part and verify the unit holds temperature correctly.
Once a year. Littleton's hard water builds scale faster than in softer-water cities, so annual descaling is the minimum. If you have a whole-house softener, you might stretch it to 18 months, but most manufacturers require yearly service to keep the warranty valid. We send a reminder when your next service is due.
Most jobs run $180 to $350 for a standard descaling and inspection. If we find a failed igniter, thermistor, or inlet filter, parts add $40 to $150. Units that have not been serviced in three or more years may need a longer descaling cycle, which can push the cost to $400. We quote the full price before we start.
Littleton Plumbing Solutions does. Our technicians hold Colorado Master Plumber licenses and NATE certification. We service Navien, Rinnai, Rheem, Noritz, Bosch, Takagi, and Lochinvar units across Littleton, Ken Caryl, Bow Mar, and the surrounding Arapahoe County area. Call us at +1 303-879-0886 to schedule.
Our service includes descaling the heat exchanger with a food-grade descaler, flushing the water path, cleaning the inlet filter, testing the igniter and flame rod, checking the gas valve and pressure relief valve, and verifying the thermostat and thermistor. You get a written service report with the date, parts inspected, and any recommendations for next year.
Do not wait for a cold shower to remind you the unit needs service. Call Littleton Plumbing Solutions at +1 303-879-0886 to schedule your annual descaling and tune-up. We serve Littleton, Ken Caryl, Bow Mar, and all of Arapahoe County. Same-day appointments available.
Schedule Service +13038790886 →Call us at +1 303-879-0886 or send an email to info@littletonplumbingsolutions.com. We answer the phone 24/7 for emergencies and book regular service Monday through Friday. Most calls get a same-day slot, and we will give you a real arrival window, not a four-hour block.