Can I service my own tankless water heater?

Author: Tre Von  |  Last update: Wednesday, November 19, 2025

Can I Do My Own Tankless Water Heater Maintenance? Navien tankless water heater maintenance is relatively simple. You certainly don't need to be a professional plumber, but it doesn't hurt if you are comfortable tackling the occasional DIY project. Whether or not you're ready is entirely up to you.

Can you service a tankless hot water heater?

Descaling, the process of removing mineral buildup, will keep your tankless water heater running at peak performance. It can even increase the appliance's lifespan by years. However, you should not perform this on your own as only a professional plumber should perform this task.

How much does it cost to service a tankless water heater?

Common Tankless Water Heater Maintenance Expenses

Labor costs can range from $50 to $150 per hour, while replacement parts can cost between $20 to $500, depending on the part's complexity and brand.

What happens if you don't descale your tankless water heater?

What happens if I don't flush out my tankless water heater? Mineral deposits may build up. This could cause a clog within the unit and may prevent normal heating activity. Your hot water could also fluctuate and overheat the system, impacting its efficiency.

How much does a plumber charge to descale a tankless water heater?

Flushing and descaling are important parts of that maintenance, no matter what kind of water you have. Descaling your tankless water costs between $150 and $450 on average.

Tankless Water-Heater Maintenance

Is vinegar or descaling solution better for tankless water heaters?

A tankless water heater descaler specifically designed for this purpose is recommended for optimal results. Alternatively, you can use vinegar as a natural and affordable descaling solution. Prepare the solution according to the manufacturer's instructions.

How much does it cost to have someone flush a tankless water heater?

The average cost to flush a tankless water heater can vary. On average, homeowners can expect to spend between $100 and $300 for a professional flush, including any additional maintenance services required. DIY flushing costs can range from $30 to $100, depending on the flushing kit purchased.

How long do tankless water heaters usually last?

A tankless water heater can last anywhere from 15 to 20 years with proper maintenance and operation. In comparison, a standard tank water heater normally has a working life of 10 years or less. How Do Tankless Water Heaters Work?

How often should I flush my tankless water heater?

Whether you're a recent convert, or you've owned your tankless water heater for several years, you likely have questions about how often you should clean the unit. Most manufacturers recommend annual flushing of your water heater.

Can I use vinegar to flush my tankless water heater?

Use 4 gallons (15.1 liters) of undiluted white vinegar to clean your tankless water heater. Never use chemical solutions of any kind. Since your home's drinking and bathing water mostly likely flows through your tankless water heater, using chemical cleaning solutions could be extremely harmful to your health.

What happens if tankless water heater is not flushed?

You need to flush a tankless water heater once a year to get rid of mineral deposits and sediment that block the water flow. If you don't, this problem can cause your tankless hot water heater to stop working. You also might void the warranty by not doing it.

Is it OK to unplug a tankless water heater?

There are no renowned damages that come with turning off the heat supply for your tankless water heater. Turning off your water heater and the main water supply is best for you when you are going for a break.

Can a handyman install a tankless water heater?

“Water heater installers” can encompass a variety of professionals, but in most cases, a plumber or a handyman is the best choice for this project. One of the most important considerations is whether the professional has had experience completing similar installations.

How do I know if my tankless water heater needs to be flushed?

Common signs it's time to flush or drain your water heater include:
  1. Low water pressure.
  2. Water takes a long time to heat up.
  3. Water isn't the correct temperature or fluctuates.
  4. Noises coming from the tank, such as rumbling or popping.
  5. Sludge or discolored water.
  6. Frequent Repairs.

Does a plumber or electrician install a tankless water heater?

While some handy homeowners might feel comfortable installing small electric point-of-use units, whole-house systems require licensed professionals for gas lines, venting, and electrical work. A certified plumber can provide the following services: Correct gas line sizing. Safe electrical connections.

What is the downside of a tankless water heater?

Before you commit to buying a tankless water heater, the primary drawbacks to know include: Higher upfront costs. Tankless water heaters are, on average, quite a bit more expensive to buy and install than tank water heaters. Access to fuel.

What maintenance does a tankless water heater need?

The most complicated and time-consuming tankless water heater maintenance is typically descaling and flushing out the unit. Even with the inline water filter, lime and calcium deposits can build up inside the tankless system. If you have hard water, it's a good idea to descale and flush the unit once a year.

Can you run out of hot water with a tankless water heater?

Endless Supply of Hot Water

The tankless water heater is—you guessed it—tankless! Because there's no tank, it doesn't work off of capacity; it works off demand. A tankless water heater heats up water as you need it, and it brings hot water to your appliances quickly—and never runs out.

How much does your electric bill go up with a tankless water heater?

How Much Electricity Does a Tankless Water Heater Use? Many people wonder if tankless water heaters increase electric bills. The answer is no — tankless water heaters can save money on your monthly electric bill because they're 8%-34% more efficient than storage water heaters.

Can I flush my water heater myself?

You can flush your water heater yourself if it's done on a regular basis. This guide will take you through the steps to drain and flush a gas or electric water heater. Learning how to clean a water heater is an essential part of maintaining your plumbing system.

How much do plumbers charge to flush a water heater?

The national average cost to flush a water heater is $160, but prices can vary in increments based on the tank size. A 30-gallon tank will cost between $90 and $120 on average, while a 70-gallon tank could cost anywhere between $180 and $250.

Can I put CLR in my hot water tank?

Can I use CLR on my water heater? No, Jelmar DOES NOT RECOMMEND the use of CLR on a water heater; however, there is a web site that does.

Why does my tankless water heater turn blue when I flush with vinegar?

The vinegar will be a bit blue. This is from tiny amounts of corrosion of the copper of the tubes in heater. The copper imparts the blue color. Nothing to worry about.

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