If you have a Tankless Water Heater, annual maintenance is required to maintain the warranty. The water heater must be flushed with a special solution and should be performed by a licensed plumber.
Not having the maintenance performed can and most likely will cause the tankless water heater to fail sooner. If it does and the maintenance has not been performed, the failure will not be covered by the warranty. It also cost more to replace than to have the maintenance performed.
If you have a Tankless Water Heater, CALL US and let us setup annual flush and service of your Tankless Water Heater.