Tankless Water Heater Pros And Cons

Tankless water heaters, also known as on-demand water heaters, are a type of water heating system that heats water as it is needed, rather than storing it in a tank like a traditional water heater. They have gained popularity in recent years due to their energy efficiency and ability to provide a continuous supply of hot water. However, tankless water heaters also have some drawbacks that should be considered before deciding if they are the right choice for your home. In this article, we will explore the pros and cons of tankless water heaters to help you make an informed decision.

Tankless Water Heater Pros And Cons

When deciding on the right tankless water heater for your home then you should be sure to consider both the pros and cons of tankless water heaters. Here are a few most significant tankless water heater pros and cons that you should consider for the installation of a tankless water heater in your home.

Advantages of Tankless Water Heater 

Are you tired of running out of hot water during your shower or waiting for your tank to refill before doing your laundry? A tankless water heater may be the solution to your problems. Tankless water heaters provide a continuous supply of hot water and can save you money on your energy bills. Keep reading to learn more about the many advantages of tankless water heaters.

Energy Efficient

According to the U.S. Department of Energy, a tankless water heater is a type of water heater that is more efficient and consumes less energy than a traditional water heater. This can result in annual savings of $25 to $107. If you use fewer than 41 gallons of hot water per day, a tankless water heater can be 24%-34% more efficient, and even if you double that amount, it can still be 8%-14% more efficient.

Tankless water heaters can save up to 50% of energy if installed in every location. Therefore, a tankless water heater is a great investment compared to a storage-tank water heater. Gas tankless water heaters are less energy efficient than electric heaters, with the ability to heat about 86 gallons per day. In comparison, an electric tankless water heater is more energy efficient than a gas tankless water heater.

Saves Money

You can save money by using this budget-friendly tankless water heater, which is probably the most neglected appliance in your home. Despite being installed three years ago in winter, this durable water heater has not experienced any issues with its performance.

In addition to its long-lasting use, this tankless water heater is also energy-efficient. If you have an electric tankless water heater, it will likely cost less to operate, even in areas with high energy costs. However, if you compare an electric tankless water heater to a gas tankless water heater, the gas option may be more cost-effective. Because, propane rates are typically lower than electricity rates.

Saves Space

Tankless water heaters are much smaller and can be mounted on a wall, which can save space in your home. They are about the size of a suitcase, whereas traditional tank water heaters can be quite large and take up a significant amount of space.

In cities, there are very congested spaces in houses so, this tankless water heater will save space by consuming less space. If we compare electrical tankless water heaters and gas tankless water heaters then both tankless water heaters are more efficient in space saving.

Hot Water Supply

Tankless water heaters provide a continuous supply of hot water, so you never have to worry about running out during your shower or washing dishes. This is because they heat water on demand, rather than storing a limited amount in a tank.

Tankless water heaters are renowned for their ability to provide a continuous supply of hot water. These heaters work by heating cold water as it is needed, rather than storing hot water in a tank like traditional water heaters. This means that as long as you keep the tap running, you can have an unlimited supply of hot water.

Longer lifespan:

Tankless water heaters have a longer lifespan than traditional water heaters because they don’t have a tank that can rust or corrode. Tankless water heaters can last up to 20 years, while traditional tank water heaters usually only last about 10-15 years.

Environmentally friendly:

Tankless water heaters use less energy, which can help reduce your carbon footprint and protect the environment. They also produce fewer greenhouse gas emissions, which can help reduce air pollution.

Increased property value:

Tankless water heaters are seen as a modern, energy-efficient amenity that can increase the value of your property. They can make your home more attractive to potential buyers or renters. Along with this, they can potentially add value to your home if you decide to sell.

Disadvantages of Tankless water heater

Limited Hot Water Output for Multiple Outlets

Indeed, a tankless water heater can only heat a certain amount of water at once. So, if there is a demand for more hot water than the unit can handle, for instance, if someone is using the dishwasher, shower, and washing machine at the same time, the water temperature may fluctuate.

In this case, you may need to install more than one unit to meet the demand for hot water. On the other hand, if you can limit the amount of hot water being used at once, you may be able to use a single tankless water heater

Power Outage

As tankless water heaters are of many types such as gas models and electrical models to run and regulate. So, tankless water heaters may not provide hot water during power outages, depending on the type

Unit Cost

Tankless water heaters are generally more expensive to purchase and install than traditional tank water heaters.

Installation Cost

When you want to switch from a traditional water heater to a tankless water heater then there will be some initial upfront costs for the unit and installation that you have to pay. As there are many types of tankless water heaters such as gas, electrical and bosch water heaters. But, their installation cost will vary. So, for a new installation, you have to bear the cost of new venting and gas lines that will become part of the installation.


Tankless water heaters require more frequent maintenance, such as cleaning and descaling, to ensure they are operating efficiently. Moreover, Tankless water heaters may require special venting systems, which can be expensive to install.

More what you have to face?

After installing the best tankless water heater, you have to face many problems that will be known as disadvantages. These main and important disadvantages that you have to know are system overload, flame failure, mineral buildup, cold water sandwich, ignition failure, and air supply or exhaust blockage.

Tankless Water Heater Vs Traditional Water Heater 

Traditional water heaters provide a large amount of hot water all at once, unlike some other types that continuously heat and circulate water. Tankless water heaters are more expensive to buy and install, but traditional ones need to be replaced every 10-12 years.

Tankless water heaters tend to have longer lifespans and offer energy savings compared to traditional water heaters. On average, tankless water heaters tend to cost slightly more than traditional models, which usually range in price from $500 to $1500. However, tankless water heaters may pay for themselves through energy savings within a few years of installation. One advantage of tankless water heaters is that they typically require less maintenance than traditional water heaters.

Tankless Water Heater Pros and Cons for RV

There are most significant tankless water heater pros and cons that you should consider for the installation of a tankless water heater in your RV. When you need hot water on demand from a tankless water heater for RV then it is essential to act in accordance with these pros and cons. These pros are given below:

  • Never run out of water while travelling due to its big capacity feature.
  • Very lightweight for RV use.
  • No waiting and no planning are needed for the hot water supply.
  • No temperature fluctuation due to less usage capacity.
  • Circulation of water will protect it from freezing.
  • Having a low flow rate.
  • They require a larger gas line and higher gas pressure, which may not be feasible in some homes.


What is the downside of a tankless water heater?

A tankless water heater has a limit on how much hot water it can produce at once. If, you use more hot water than the unit can handle, the water temperature may fluctuate.

What are the most common problems with tankless water heaters?

In every tankless water heater, there are many common problems and maintenance occur that are concerns for tankless water heaters. So, some of these issues are: Mineral Buildup Cold Water Sandwich System Overload Ignition Failure Air Supply or Exhaust Blockage Flame Failure

Is it worth switching to a tankless water heater?

Tankless water heaters are more energy efficient than traditional water heaters, according to the U.S. Department of Energy. These heaters can save homeowners an average of $25-$107 per year in energy costs. For households that use less than 41 gallons of hot water daily, a tankless water heater can be 24%-34% more efficient than a traditional water heater.


In conclusion, tankless water heaters can be a good option for households that want an endless supply of hot water and are willing to pay a higher upfront cost for the increased energy efficiency and longer lifespan. However, they may not be suitable for households with high hot water demand or limited space and gas infrastructure.

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