Water Heater Maintenance

Mineral scale isn't the only material a technician checks during tankless heater maintenance. Inlet filters can collect debris from the water supply. Gas models also have burners, ignition components, and venting that need inspection. Electric models rely on heating elements and electrical connections instead. Regular maintenance gives a dependable plumber a chance to inspect these components while servicing the water side of the system.

Why Tankless Water Heaters Need an Annual Flush

Tankless units don't store dozens of gallons of water, but that doesn't eliminate the need for cleaning. Water still passes through the heat exchanger each day. A tankless water heater annual flush removes mineral deposits from those internal passages before a thick layer develops.

The exact maintenance procedure and schedule depend on the manufacturer and model. Water quality and household use can also affect how quickly deposits form. Owners should check the maintenance instructions for their specific equipment. Rheem, Rinnai, Navien, and other manufacturers publish service requirements for their individual models.

A professional tankless water heater flush normally uses a pump to circulate an approved descaling solution through the heat exchanger. The solution dissolves mineral deposits so they can be flushed from the system. The plumber then rinses the unit according to the manufacturer's procedure. People who search for ways to descale tankless water heater systems at home should check the owner's manual first. Valve arrangements, approved solutions, and service procedures vary between models.

Annual service also provides an opportunity to check components beyond the heat exchanger. A technician may inspect or clean the inlet filter and examine the system for leaks. The specific checklist depends on whether the unit uses gas or electricity. A tankless water heater service appointment should follow the maintenance requirements listed for that particular unit rather than a single procedure applied to every model.

Gas and Electric Tankless Systems Have Different Maintenance Needs

Both gas and electric tankless units can develop mineral scale because both heat the same incoming water. That makes descaling part of tankless heater maintenance regardless of the energy source. The components around the heat exchanger, however, differ considerably.

A gas tankless system uses combustion to heat water. Along with a tankless gas water heater flush, service may include an inspection of the burner, ignition system, gas connections, and venting. Proper combustion depends on adequate airflow and an unobstructed vent system. A blocked vent or dirty burner can affect operation even when the water passages are clean.

Electric tankless systems don't have burners or combustion vents. They use electrical heating elements instead. Maintenance focuses on the water passages, inlet filter, heating components, and electrical connections specified by the manufacturer. Scale still matters because mineral deposits can interfere with heat transfer inside the unit. A qualified plumber can also look for warning signs during tankless gas water heater maintenance or electric system service. Watch for problems such  as:

• Hot water temperatures that change unexpectedly
• Reduced hot-water flow at multiple fixtures
• Error codes that return after the unit resets
• Unusual sounds when the water heater runs
• Water around the unit or visible signs of a leak
• A system that shuts down during normal hot-water use

These symptoms don't prove that scale is responsible. A dirty filter, faulty sensor, ignition problem, electrical issue, or another component can produce similar results. Professional tankless water heater service can identify the source before a minor service issue turns into a loss of hot water.

Traditional Tank Water Heaters Need Flushing, Too

Tankless systems deserve extra attention because scale forms inside compact heat exchangers, but conventional water heaters also collect material from the water supply. In a storage model, sediment settles at the bottom of the tank. A flush removes accumulated material through the drain connection.

Sediment can create several problems inside a traditional tank. In a gas model, deposits at the bottom can interfere with heat transfer from the burner. Electric tanks use heating elements inside the water, and mineral deposits can collect on those components. Sediment may also contribute to popping or rumbling sounds during a heating cycle.

Gas and electric storage models have additional maintenance points. A plumber can inspect accessible connections for leaks and check components appropriate to the type of heater. The temperature and pressure relief valve also plays a safety role on a storage tank and should be handled according to the manufacturer's maintenance instructions.

Tankless systems require the same model-specific approach. The valves, filters, heat exchanger design, and maintenance instructions vary between manufacturers. A professional tankless water heater flush should follow the procedure specified for the equipment installed in the home.