- Descaling solution: You can purchase a commercial descaling solution from your local hardware store or online retailer. Or you can make your own descaling solution by mixing equal parts of white vinegar and water.
- A pump: A small submersible pump will do the trick. If you don’t have one on hand, you can rent one from a hardware store.
- Protective gloves: When working with descaling solutions, it’s important to wear protective gloves to avoid skin irritation.
- Plastic bucket: You’ll need a plastic bucket to catch the runoff from the descaling process.
- Garden hose: Attach the garden hose to the faucet nearest your tankless water heater so that you can easily dispose of the runoff. Make sure the hose is rated for hot water use.
- Turn off the power to your tankless water heater.
- Attach the hose to the outlet on your tankless water heater and route it outside. Turn on the pump and let it run until the vinegar or citric acid solution has been pumped into the unit.
- Once the vinegar or citric acid solution has been pumped into your system, turn off the pump and disconnect the hose. Close all valves and allow the solution to sit in the unit for at least an hour. This will give it time to work its way through all the internal components and break up any scale buildup.
- Restart your water heater according to the manufacturer’s instructions. Run hot water through all the fixtures until you can no longer smell the descaling solution.
Keep an Eye on Water Pressure
Clean Filters Regularly
Winterize the Unit
Have the Unit Serviced by a Professional Every Few Years
At MT Drains & Plumbing, our experts can help you keep your tankless water heater in good condition, so you can enjoy the benefits of this energy-efficient appliance for years to come. We have years of experience servicing and repairing tankless water heaters and are always here to help if you run into any problems.