Most Common Issues That Affect Tankless Water Heaters

• Overload

Even though tankless water heaters heat water on demand, these units have a flow rate capacity. A water heater’s flow rate capacity refers to the maximum amount of water the unit can deliver at a specific temperature rise per minute. If you exceed that capacity, then you could overload your water heater. This is one of the main causes of water heater failure.

Solution

When using hot water, avoid exceeding your heater's flow rate capacity. For example, if your heater has a 4 GPM (gallons per minute) capacity, don't run a shower that uses 3 GPM and a dishwasher that uses 2 GPM simultaneously. This will overload the system. If you’re experiencing this problem frequently, your tankless water heater could be undersized, and it may be time to upgrade. Call a plumbing service that specializes in tankless water heater installation to evaluate your hot water needs and install a properly sized unit.

• Ignition Failure

Another common issue that affects both gas-powered and electric-powered tankless water heaters is ignition failure. The ignition can fail as a result of gas supply problems, a dirty burner, circuit breaker issues, and more.

Solution

For a gas-powered tankless water heater, check if the gas valve is fully opened and inspect the venting system. In the case of an electric-powered tankless water heater, check if the circuit breaker has tripped. If you’re unable to resolve the problem, reach out to a reputable plumbing service for water heater repair or water heater replacement.

• Overheating

This problem happens when the components that regulate the heating process malfunction. For instance, a malfunctioning temperature sensor might send an incorrect signal, leading to overheating. Overheating should be addressed as quickly as possible to prevent scalding.

Solution

Ensure all hot and cold water shut-off valves are fully open, and ensure there are no blockages in the exhaust vent. Don't attempt to disassemble or repair the tankless water heater yourself. Call a reputable plumbing repair service to diagnose the cause of overheating and recommend the appropriate repairs.

• Mineral Buildup

Mineral buildup doesn’t just affect conventional storage tank water heaters; it is also a common problem for tankless units. If you live in an area with hard water, the minerals in the water will accumulate inside the unit over time. The mineral buildup will reduce the unit’s efficiency, increase your heating bills, and potentially lead to premature failure.

Solution

Call a professional plumbing repair service to descale your water heater regularly to remove mineral buildup and ensure optimal performance. If you want a long-term solution, consider installing a water softener to reduce the impact of hard water on your plumbing.

Let the Experts at Mr. Rooter Plumbing Help You Keep Your Tankless Water Heater Running Smoothly

If your tankless water heater is acting up and you need professional help, reach out to Mr. Rooter Plumbing. Our professional plumbers at Mr. Rooter Plumbing are well-versed in water heater repair, tankless water heater installation, water heater replacement, and more. If you need reliable water heater services, do not hesitate to reach out to us for professional assistance.