Tankless Water Heater Maintenance Tips for Redlands Homeowners

Why Maintenance Matters in Redlands

Tankless water heaters are marketed as lower-maintenance than traditional tank units — and in soft-water areas, that's broadly true. In Redlands, it's not. The Inland Empire's characteristically hard water deposits calcium carbonate scale inside the heat exchanger — the core component where cold water is rapidly heated — at a rate that can meaningfully degrade performance within a single year of operation without maintenance.

Scale acts as an insulator. Even a thin layer on the heat exchanger surfaces forces the unit to fire longer and at higher intensity to deliver the same outlet temperature, increasing gas consumption and thermal stress on the exchanger. Left unaddressed, scale accumulates to the point where the heat exchanger can crack — a failure that typically requires complete unit replacement. Annual descaling in Redlands isn't optional; it's what keeps your investment performing and lasting as advertised.

Annual Descaling (Flushing)

Descaling — also called flushing — is the most important tankless maintenance task. It involves circulating a mild food-grade acid solution (white vinegar or a commercial citric acid descaler) through the heat exchanger to dissolve and flush out mineral deposits. The process typically takes 45 to 90 minutes.

Professional descaling requires shutting off the gas and water supply, connecting a pump and hoses to the service ports on the unit (which most tankless units have built in), circulating the solution for the manufacturer-recommended duration, then flushing thoroughly with clean water before restoring service. The spent solution, which contains dissolved minerals, is safe to dispose of down the drain.

For Redlands homeowners, once a year is the right interval. In particularly hard water areas or for households with very high hot water usage, twice yearly is not excessive. Your tankless unit's display may show a descaling reminder code — don't ignore it.

Inlet Filter Screen Cleaning

Most tankless water heaters have a small mesh inlet filter on the cold water inlet that catches debris before it enters the unit. In a home where the plumbing has any aging components, this filter can accumulate sediment, pipe scale particles, and other debris that reduce flow through the unit — triggering flow sensor errors or reducing the water temperature at the tap.

Cleaning the inlet filter is something most homeowners can do themselves: shut off the cold water supply to the heater, remove the filter (usually a simple screw-cap), rinse the mesh screen under running water or soak it briefly in vinegar, then reinstall. This takes about 10 minutes and is worth doing every six months in older Redlands homes where pipe debris is possible.

Venting and Combustion Air Check

Gas-fired tankless water heaters require adequate combustion air and unobstructed venting. The venting for a high-efficiency condensing unit consists of sealed PVC pipes — typically two: one intake bringing in fresh outdoor air and one exhaust. These pipe terminations, usually on an exterior wall, should be checked annually for obstructions: bird nests, insect nests, debris accumulation, or physical damage.

The combustion air intake drawing from an enclosed space (a closet or small mechanical room) should have adequate clearance and not be blocked by stored items. Restricted combustion air causes the unit to produce incomplete combustion, can trigger fault codes, and in severe cases creates carbon monoxide risk. If your unit is in an enclosed space and you're adding storage around it, make sure you're not inadvertently blocking airflow.

DIY vs. Professional Maintenance

Homeowners who are comfortable working with plumbing shut-offs and basic tools can reasonably handle inlet filter cleaning and a close look at vent terminations. Annual descaling is also something a mechanically inclined homeowner can do with a descaling pump kit (available from plumbing supply stores), a bucket, and a food-grade descaling solution.

However, professional annual maintenance goes beyond descaling. A plumber will also check the gas pressure and flow, inspect the heat exchanger for early signs of corrosion or cracking, test the temperature and pressure relief valve, verify the unit's error code history, and check all connections. For gas appliances especially, having a professional set of eyes on the system annually is worthwhile. We offer tankless water heater maintenance service throughout Redlands Heights and the surrounding area — call (207) 419-2600 to schedule.

Signs Your Tankless Needs Service

Between annual maintenance visits, watch for these signals that your tankless unit needs attention:

• Error codes on the display — every manufacturer uses different codes; check your manual or call us
• Reduced hot water temperature or inconsistent hot water delivery
• Longer-than-usual wait for hot water to arrive at fixtures
• The unit firing and shutting off repeatedly in a short period (short-cycling)
• Any visible water around the unit — even a small amount indicates a connection or heat exchanger issue
• The unit running longer to heat the same amount of water compared to when it was new

In Redlands' hard water environment, if it's been more than 18 months since the last descaling and you're noticing any of these symptoms, schedule service promptly. Descaling early is far less expensive than replacing a heat exchanger.