Yes, you can flush a tankless water heater yourself if you're comfortable with basic plumbing and have the right equipment. The process usually takes about an hour. However, hiring a pro for tankless water heater maintenance helps prevent potential mistakes and ensure the job is done correctly.

It’s a good idea to get your tankless water heater serviced at least once a year. This annual check-up helps prevent mineral buildup, an issue that can reduce efficiency and lead to expensive repairs. Regular maintenance also supports your heater's safe operation and helps extend its lifespan.

Regular maintenance is key for a tankless water heater because it helps keep the system efficient, reliable, and long-lasting. Over time, mineral buildup from hard water can collect inside the unit, reducing heating performance and increasing energy use. Routine flushing and inspection prevent scale buildup, help maintain consistent hot water, and reduce the risk of unexpected breakdowns. Regular maintenance also helps protect internal components and can extend the lifespan of the unit while keeping manufacturer warranties valid.

Skipping a flush means that mineral deposits may build up inside your unit. This scale can reduce efficiency, restrict water flow, and eventually cause the heater to fail. If you're already noticing issues, you may need professional water heater repair to fix the damage.

Several factors are considered in the cost of professionally maintaining a tankless water heater, including:

• Unit type: Gas-powered tankless heaters can be more complex to service than electric models.

• Water hardness: If you live in an area with hard water, your system will probably have more mineral buildup. This can make the descaling process more time-consuming.

• Accessibility: If your unit is installed in a hard-to-reach spot like a cramped closet or attic, the pro may need more time to service it safely.

• Labor rates: The cost of labor can vary based on your location and the experience level of the person you hire.

• Additional repairs: Sometimes a routine check-up uncovers other issues. If the technician finds any parts that need to be repaired or replaced, this will typically add to the final cost.

Before hiring someone to service your tankless water heater, here are a few questions you can ask:

• Are you licensed, bonded, and insured to work on gas or electric appliances in my area?

• Do you have experience servicing my specific brand and model of tankless water heater?

• What does your standard maintenance service include?

• How do you charge for this service? Is it a flat rate or an hourly fee?

• What happens if you find a problem that requires a repair during the maintenance visit?

• Do you offer a warranty or guarantee on your workmanship?

• How long should the project take?