Tankless water heaters should be serviced annually by having the system flushed to remove scale buildup and deposits. Mineral buildup will reduce the efficiency of the heat exchanger and shorten the lifespan of the unit. Routine maintenance is particularly important in homes with hard water as scale buildup will occur more quickly. Cleaning of the air filter and water filter (if present) also need to be conducted on an annual basis to ensure proper operation.
What are the maintenance requirements of a tankless water heater?