How do I know if I need a new tankless water heater?

Author: Nina Jacobson  |  Last update: Friday, January 30, 2026

Signs you need a new tankless water heater include:
  • Increased Energy Bills. Tankless water heaters are known to save you money on heating costs. ...
  • Poor Hot Water Quality. You may notice the hot water isn't the same anymore. ...
  • Strange Noises. ...
  • Age. ...
  • Multiple Charlotte Water Heater Repairs.

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

To help you identify when you have a tankless water heater in trouble, we've listed several warning signs to watch for:
  1. A drop in hot water pressure. ...
  2. Lukewarm water. ...
  3. The water heater keeps shutting off. ...
  4. Unusual behavior from other appliances. ...
  5. Leaks.

How to know when a tankless water heater is going bad?

One of the most noticeable signs of a failing tankless water heater is fluctuating water temperatures. Imagine stepping into a shower, only to be greeted by a sudden blast of cold water, followed by scalding hot water. This inconsistency can be not only frustrating but also a potential safety hazard.

How often do tankless water heaters need to be replaced?

With proper maintenance, a tank water heater tank should last six to 12 years. A tankless water heater can last for more than 20 years. Check your water heater's warranty for the most accurate timelines.

Do you ever have to replace a tankless water heater?

Regular maintenance of any home appliance extends the life span of the unit. A tankless water heater that is not serviced will start to see problems within the first 2-3 years of installation. A tankless water heater can last up to 20 years, if not longer if serviced annually. You can service the water heater and cha.

3 Things They Don’t Tell You About Tankless

How much does it cost to replace an existing tankless water heater?

For an electric tankless water heater, the average cost is around $8,850. Replacing a gas tankless water heater costs approximately $4,700, while replacing an electric tankless water heater costs about $4,200. Factors such as fuel type, brand, labor, and home modifications can influence the overall installation cost.

Is there an IRS tax credit for a tankless water heater?

The federal tax credit for tankless water heaters in 2024 is an excellent opportunity for homeowners to save money while investing in energy-efficient water heating solutions. This tax credit is effective from January 1, 2023, to December 31, 2032.

How do you tell if you need a new water heater?

5 signs you need a new water heater
  1. Your older water heater is getting up there in age. ...
  2. It's making strange noises. ...
  3. You're getting rusty water out of the tap. ...
  4. Your hot water doesn't last as long as it used to. ...
  5. There are water puddles around the unit.

What happens if you don't flush a 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 long does it take to swap out a tankless water heater?

To summarize, a tank to tank installation can last up to three hours to four hours. Tank to tankless may last a bit longer. And going from a tankless to another tankless water heater will usually take no more than three to four hours.

How to diagnose a tankless water heater?

First, check to ensure your tankless heater receives power. Check that the circuit breaker hasn't tripped if it's an electric unit. If it's a gas unit, ensure the gas supply valve is open and the pilot light is lit. Another common reason for no hot water is a problem with the water supply.

Do tankless water heaters need to be flushed every year?

Over time, a tankless water heater may accumulate mineral build up which can erode the walls inside your tank's heating chamber. To properly maintain and clean your tankless water heater, it's important to flush those mineral deposits at least once a year.

Why does my tankless water heater go cold in the middle of a shower?

Overloaded Demand: Tankless water heaters provide hot water on demand, but they have limitations on the amount of hot water they can produce simultaneously. If multiple fixtures or appliances are drawing hot water simultaneously, the heater may struggle to keep up with demand, resulting in cold water.

How do you know when your tankless water heater is going out?

Turn on the hot water for one sink and see if it comes out cloudy, rusty, or smells bad. If some, there is trouble in your tankless heater. The system creates strange noises. Last but not least, make sure you are listening to your water heater every once in a while.

When should I replace my instant water heater?

An instant water heater is no different. After you have used your instant water heater for around ten years, you are likely to notice some water heater issues that suggest that it will break down entirely soon. You may only consider replacing your water heater only after it stops working.

Do tankless hot water heaters need to be serviced?

However, while they may be low maintenance, they do still need to be monitored and serviced by a professional from time to time. It's recommended that you have your tankless hot water heater serviced at least once a year by a professional.

What is the average cost to 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.

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.

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.

What are signs your water heater is going bad?

Water heaters show several signs of going bad, including lack of hot water, temperature fluctuations, decreased water pressure, strange noises, rotten egg smell, visible leaks, rusty or discolored water, and increased energy bills. If your water heater is over 10 years old, it may be time to consider a replacement.

How long does it take a plumber to replace a water heater?

Once you decide to (or are forced to) replace your current water heater, there are a few decisions you need to make to get the process started. If there are no issues or complications, a licensed plumber should be able to complete the process in 2-3 hours.

How often should I replace a tankless water heater?

Frequent Repairs

Although a tankless water heater should last 20 years, it may only last 15 years if it's not properly maintained. As new technology comes out, it makes more sense to replace your current water heater with a more efficient model.

What is the tax credit for tankless water heaters in 2024?

Homeowners can receive a tax credit of 30% of the project cost, up to $2,000, for Heat Pump Water Heaters installed between January 1, 2023, and December 31, 2032. Gas Storage Water Heaters, Tankless Gas Water Heaters, and Boilers also qualify for a tax credit of 30% of the project cost, up to $600.

What category appliance is a tankless water heater?

Tankless water heaters don't always fit into one category. Many of these appliances are Category IV, condensing with induced draft. Some fall into Category III, induced draft with higher temperature non-condensing flue gases.

Is installing a new hot water heater tax deductible?

Water Heater Tax Credit Details.

You can claim 30% of the project cost, up to a $2,000 maximum credit.

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