{"id":520,"date":"2025-03-21T09:57:46","date_gmt":"2025-03-21T16:57:46","guid":{"rendered":"https:\/\/www.swiftplumb.com\/blog\/?p=520"},"modified":"2026-03-22T21:54:19","modified_gmt":"2026-03-23T04:54:19","slug":"tankless-water-heater-maintenance-what-you-need-to-know","status":"publish","type":"post","link":"https:\/\/www.swiftplumb.com\/blog\/water-heater-service\/tankless-water-heater-maintenance-what-you-need-to-know\/","title":{"rendered":"Tankless Water Heater Maintenance: What You Need to Know"},"content":{"rendered":"\n
\"Plumber<\/a><\/figure>\n\n\n\n

Tankless water heaters provide energy efficiency and endless hot tap water supply<\/a>, but like any appliance, they require regular maintenance to perform at their best. Without proper care, mineral buildup\u2014often caused by hard water minerals like calcium and magnesium\u2014can reduce efficiency, cause performance issues, and lead to costly repairs. Understanding the maintenance requirements for tankless water heaters is essential for ensuring their longevity and optimal energy efficiency.<\/p>\n\n\n\n

At Swift Plumbing & Heating, we help homeowners in Bainbridge Island, WA, keep their tankless water heaters in top condition with expert maintenance services. Regular upkeep, including annual maintenance, is essential to prevent mineral buildup, maintain energy savings, and ensure your system operates at peak performance.<\/p>\n\n\n\n

Understanding Tankless Water Heaters<\/strong><\/h2>\n\n\n\n

Tankless water heaters are a modern solution for many homeowners seeking energy efficiency and a continuous supply of hot water. Unlike traditional tanks that store and heat a large volume of water, tankless water heaters heat water only when you need it, providing hot water on demand. This on-demand approach not only reduces energy consumption but can also lead to lower energy bills over time. With regular maintenance, a tankless water heater can deliver reliable performance and last up to 20 years or more, making it a smart investment for those looking to maximize efficiency and minimize long-term costs. Understanding the basics of tankless water heater maintenance is key to ensuring your system remains efficient and dependable for years to come.<\/p>\n\n\n\n

How Often Should You Maintain a Tankless Water Heater?<\/strong><\/h2>\n\n\n\n

Annual Professional Inspection<\/strong><\/h3>\n\n\n\n

Scheduling a professional inspection once a year ensures your tankless water heater is operating efficiently. The inspection process typically follows a maintenance checklist, allowing the technician to systematically check for leaks, test safety mechanisms, and clean internal components to prevent potential issues before they escalate.<\/p>\n\n\n\n

During this process, the technician may also recommend replacing worn or faulty components, such as the air filter, pressure relief valve, or anode rod, to maintain optimal operation and safety.<\/p>\n\n\n\n

Flushing the System Every 12 Months<\/strong><\/h3>\n\n\n\n

Flushing the tankless water heater at least once a year is essential to remove mineral deposits and maintain efficiency. Mineral deposits from hard water can accumulate inside the heat exchanger, reducing efficiency and increasing wear. Hard water consists of high concentrations of dissolved minerals, mainly calcium and magnesium, which are the primary hard water minerals responsible for scale buildup. Scale accumulation restricts water flow and forces the system to work harder, potentially shortening its lifespan.<\/p>\n\n\n\n

To flush the system, first turn off the cold water supply to the unit. Place a bucket under the drain to safely collect water and sediment during the process. Use the drain to remove water from the heater before starting maintenance. A pump is used to circulate vinegar through the system, which is a common cleaning agent that helps dissolve scale and sediment. Flushing the tankless water heater can help remove existing scale deposits and keep the unit running efficiently.<\/p>\n\n\n\n

Cleaning the Air and Water Filters<\/strong><\/h3>\n\n\n\n

Tankless water heaters contain an air filter, an air intake filter, and water filters that can become clogged with debris. The air intake filter is crucial for preventing debris from entering the unit and should be cleaned regularly to ensure optimal airflow and prevent malfunctions. To clean the air intake filter, access and remove it according to your unit\u2019s instructions, then rinse it thoroughly with clean water before reinstalling. The inlet water filter should be cleaned every six to twelve months to prevent clogs and maintain strong water flow. Cleaning or replacing these filters every few months helps maintain proper water flow and ensures the system runs efficiently. Filters should be replaced if they show signs of damage or excessive wear.<\/p>\n\n\n\n

Checking the Pressure Relief Valve<\/strong><\/h3>\n\n\n\n

The pressure relief valve prevents excessive pressure buildup, which can be a safety hazard. When testing the valve, place a bucket underneath to catch any released water. Testing it once a year helps ensure the system operates safely and effectively. If the valve does not function properly during testing, it should be replaced to maintain safety.<\/p>\n\n\n\n

Hard Water Considerations for Tankless Water Heaters<\/strong><\/h2>\n\n\n\n

If you live in an area with hard water, your tankless water heater faces extra challenges. Hard water contains high levels of minerals like calcium and magnesium, which can accumulate inside your water heater and lead to scale buildup. This mineral buildup can reduce efficiency, restrict water flow, and even cause damage to the system over time. To protect your tankless water heater, consider installing a water softener or an anti-scale device to help minimize mineral deposits. Regular maintenance, such as cleaning filters and flushing the system, becomes even more important in hard water areas. Checking your water quality and adjusting your maintenance schedule accordingly will help maintain your heater\u2019s performance and extend its service life.<\/p>\n\n\n\n

Safety Precautions for Maintenance<\/strong><\/h2>\n\n\n\n

Safety should always come first when performing maintenance on your tankless water heater. Before starting any maintenance tasks, make sure to turn off the power supply and, if you have a gas unit, shut off the gas line as well. Always follow the manufacturer\u2019s instructions in your user manual to avoid damaging the system or voiding your warranty. When working with electrical or gas components, take extra care and use protective gear such as gloves and safety glasses to prevent injuries. If you\u2019re ever unsure about a maintenance step or encounter something unfamiliar, it\u2019s best to contact a qualified plumber or professional service to ensure your tankless water heater is maintained safely and correctly.<\/p>\n\n\n\n

Benefits of Regular Tankless Water Heater Maintenance<\/strong><\/h2>\n\n\n\n