Ever considered switching to a tankless water heater, but want to know what the upkeep is like first? Have a tankless water heater and it's time to service it? You're in luck. In this video, Matt Risinger shows us how to flush a tankless water heater.First, why do you need to flush your tankless water heater? Tankless units have a gas engine, which can cause a scale buildup inside the tank.If you have hard water or a large household, you should flush your tank every 12 months. If you have a water softener or a small household, you can do this every 2 to 3 years.In this video, Risinger uses a flow-aid kit, which you can get on Amazon. Before you begin flushing your unit, remove the unit from power, turn off the gas line, shut off the flush lines, and disconnect the water. If you don't have flush lines," then you'll need to get a plumber to install them before you begin flushing the unit.Want to see a step-by-step demonstration of how to flush your tankless water heater? Watch the full video and you'll be an expert.