How does a Tankless Water Heater Work?

If you don’t want to risk running out of hot water just when you need it (while you’re showering while doing the dishes…), the best solution for you is to give tankless water heaters.

But how do they work? And how are they never run out of hot water? In this article, we’re answering all your questions… so keep on reading if you want to find out how does a tankless water heater work.


What is a tankless water heater?

Before speaking about how it works, let’s try to define what a tankless water heater is.

Regular heaters work with a tank. Hot water is stored and kept hot in the tank, and when you need hot water in the shower, the kitchen, the bathroom, or anywhere, water comes from there. It is immediately hot, but – sooner or later – it runs out.

Tankless water heaters work differently: as their name suggests, they do not feature any tank. So how do they work?

Tankless water heaters are units that you can install anywhere you like. When needing water in your house, cold water enters the unit.

Inside the water heater, the water gets warmed so that it runs out of your faucets at the right temperature. 

You can easily understand how, with a system like this, you never run out of hot water: there is no limited amount of warmed water; there is your water system connected to a unit that can warm all the water that runs through it.

How do tankless water heaters Work?

So how does a tankless water heater work? Tankless water heaters are connected to your gas tubes. Inside the unit, the gas feeds a small flame – or set of flames – that becomes responsible for heating the water.

So, inside the tankless water heaters, you have two entering tubes: one is for cold water, and the other for gas: this can become a piece of useful information when you need to understand where to install your tankless water heater in your house.

The advantages of tankless water haters

Now that you’ve learned how they work, you can easily guess what are the advantages of tankless water heaters, especially when compared to regular hot water storage units.

  1. The main advantage is that you never run out of hot water;
  2. You can install the tankless water heater unit whenever you like in your house because it is a lot smaller than a big tank of hot water that should be able to supply the entire house;
  3. You can use a tankless water heater to provide for the entire house but also a single point of use.
  4. Tankless units only heat the water you use. On the contrary, hot water storage systems heat the water and reheat it constantly to keep it warm.

Any con?

While with regular systems, you have hot water from your faucet as soon as you turn it open, with tankless water heaters, you may have to wait for some seconds before the hot water begins to flow.

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