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How Tankless Water Heater Works [Must-Know Tips]

how tankless water heater works

Are you surprised at how tankless water heater works? Anyone would be. If you have the old traditional tank water heater, you may want to invest in this new tankless option when you learn about the advantages it has.

For starters, these tankless water heater do not have a limit to the amount of hot water they provide. They also last a bit longer than the ones with tanks. But bear in mind that they do cost more. Upgrades are also quite expensive. So, how does this modern water heater works? Read on to find out.

How tankless water heater operates

First, know that the tankless water heater is also called the on-demand or instantaneous water heater. So when you hear people use this terms, they are referring to the same thing.

Tankless water heaters raises the temperate of water directly. In other words, it does not use a form of storage tank like the traditional water heater. When you put on the hot water tap, cold water will flow through into the compartment. Based on the water heater you have, the electric element or gas burner will heat up the water.

The tankless water heater has several advantages. One of them is that you no longer have to wait for the storage tank to get filled up with water before bathing or cleaning. It is designed to deliver hot water at a rate of about 2 to 5 gallons per minute, which equates to 7.6 – 15.2 liters. There are also smaller tankless water heaters used as mentioned here. These heaters are mostly used for smaller areas like faucets, kitchen sink or bathroom.

Please note that there is a difference between the flow rate of the gas and electric water heater. The gas tankless water heater can deliver higher flow rates than the electric ones, mainly due to its heating and dimension capacity. The primary idea behind tankless water heater is to ensure that hot water is available for use straight away when needed.

Pros & Cons of The tankless water heaters


  • Take up less space.
  • Provides an unlimited amount of hot water.
  • Can help you save a reasonable amount of money annually.
  • Helps to conserve natural gas.
  • Are more durable than the tank heater. Tankless water can last ten years more than the tank water heater.


  • A bit more expensive than the tank water heater.
  • A constant upgrade is needed and is quite costly.


Considering how tankless water heater works, switching from the traditional ones to the modern ones will be a great decision. It will help you save time, especially when you are running behind schedule.

Tankless water heater does not require a storage tank and this will help save space too. The only drawback is the cost. Therefore, if you have the means, investing in the best gas tankless water heater will be a good idea.

    Verner Ellen

    Hi, my name is Verner Ellen. I am a homebody whose interest is in getting the best home tools and equipments to help with the the everyday house chores. I also love fitness, cooking and grilling. Maintaining a clean and comfortable home is my lifelong passion.