Danger of Tankless water heater feature image austin's best plumbing

Dangers of Tankless Water Heaters

Many people have a question about dangers of tankless water heaters. But it’s quite hard to answer the question in one word. If you don’t maintain safety mandatory measures, then any home appliance would be turned into a dangerous one. 

In this article, we could find out if any danger arises from tankless water heater.  

Then, we will compare the probable dangers and dangers between the tank and tankless water heater. And then we will propose some tricks to avoid those dangers if any have. So we have the answer to question like, is tankless heater water safer than tank heater? It’s “yes”. 

Now we are going to reveal the reason why there are no risks of tankless water heaters.

Tank water heater, especially modern high-efficient heaters try to supply you hot water as quickly as it can. To provide tank water heater reserve hot water into the tank. And this process is the costly part of the tankless heater.  Not only that this process often makes wait for the users for hot water. This process creates huge pressure on other parts of the tank heater.

Modern model tank heater has insulation to handle the pressure.  Into the tank hot water expand the inner air.and it is the gas that expands with hot water.  To handle the pressure there is a valve. When inner pressure increases into the tank heater, the valve release extra pressure. 

Now a serious question comes forward. If the release valve doesn’t work when it requires. What happens then?

Literally there would be an explosion. Tough this type of incident is rare, but it can be.  Now come to tankless water heater. There is no such kind of problem for tankless water heater because there is no tank in a tankless water heater. 

This model supply hot water instantly. First, you have to select the right size of tankless water heater you need. Tankless water heater save money and hassle or probable danger.

As there is no tank in a tankless water heater, so there is no pressure for developing any danger. We know liquid flow much slowly than vapor. So hot water runs through your plumber line too slowly to have any types of danger. Tankless water heater is less prone to leaks so it has little risk of damaging your home. That means tankless water heater is safer than a tank heater. 

Dangers of Gas Tankless Water Heaters

As we have already discussed overall tankless water heater danger. We knew that tankless water heater is generally safer than a conventional tank heater. Now are going to tank something about the danger of gas tankless water.

We know tankless water heater mainly use gas and electricity as fuel. And any appliances run by gas could be turned into danger if you didn’t maintain that properly. The tank heater might have open blaze and take tank itself might be hot that may cause real danger for kids and pets.

As we know tankless water heater is not dangerous they don’t have any big storage tank. A gas-powered heater has also the same features. Rather tankless water heater has sensors attached in every part. That’s why the power would be cut off it any part got too temperature. 

Caution to Avoid Danger

The Department of Energy of the U.S is much serious about saving money. But they suggest getting the help of a professional plumber for installing tankless water heater. 

Why did they say like this?

Because there are some very important matters that include tankless water heater installation. If those are violated then the danger of tankless water heaters might happen.

So firstly, don’t go for installing tankless water heater by yourself if you didn’t enough knowledge about some crucial things like local building code, type of fuel, location of the property, and safety measures. 

Every aspect we mentioned above is so important. If you avoid anyone that might be invited a danger for you.

So, we can say that it’s true there is some risk of the gas tankless water heater if you don’t maintain the proper procedure of installation. 

Dangers of Electric Tankless Water Heaters

As an electric-powered tankless water heater has no gas connection and tank as well. So it has no way to fiery eruption or explodes. Beside high-end electric-powered water heaters are designed to prevent accumulate scale as well as high pressure.  

As an electric model tankless water heater requires muck power- 120 to 160 amperes. So if you don’t upgrade your home’s existing power supply line, then horrible danger may happen. 

Caution to Avoid Danger

# Firstly, Upgrade your home’s power supply to 200 appears or more. 

# Secondly, Take the help of a professional to install an electric tankless water heater. Manufacturers suggest taking the assistance of certified electricians and plumbers. Just follow their instruction to avoid any types of dangers of tankless water heaters. 

Frequently Asked Questions :

Do Tankless Water Heaters Explode?

As tankless water heater, don’t store hot water, so they also don’t explode like a tank heater. However, if the malfunction pressure switch installed then, an explosion or fire catching incident may happen.

Some other top reasons to explode a tankless water heater for instance inappropriate adjustment of temperature and pressure, lack of routine check and maintenance or proper control, and lack of security devices or a leakage. 

Do Tankless Water Heaters Produce Carbon Monoxide?

danger of carbon monoxide austin's best plumbing

Carbon Monoxide or CO is a colorless, odorless, toxic gas.  It produces from improper combustion of solid, liquid, and gaseous fuels. An appliance powered  gas, oil, kerosene, or wood can produce this dangerous gas. 

As a gas tankless water heater might produce carbon monoxide, so we have to be careful about using and maintaining this appliance. To prevent the production of CO proper maintenance, routine inspection, and abide by the instructions by manufacturers is mandatory.

Is it Normal To Smell Gas From a Tankless Water Heater?

The answer is no, it’s not normal to smell gas from tankless water while operating. Its combustion unit is sealed. Besides two pipes connect for intake and exhaust air into a loop. 

If you smell gas while operating the tankless water heater then there might be leakage on venting. It’s deadly dangerous. Turn off the heater and call the local gas distribution authority immediately.

Can a Water Heater Explosion kill You?

A water heater explosion can cause serious damage to property, injury for humans, and pets. even it could be deadly for lives. 

What is The Downside of a Tankless Water Heater?

Instantaneous or hot water heater main downside is its beforehand cost. You may notice that a small unit of tankless water heater unable to produce to meet the requirement of a family.   

They can supply hot water only for a faucet while you may want to run a dishwasher or a shower. This time to meet up full demand you have to get a bigger one which is expensive. 

On the other hand as the tankless water heater have a special burner unit, so they need special venting. And a professional plumber is required for this dedicated, sealed vent system installation.  

And, the natural gas burners have a need for a bigger diameter gas pipe which increases the installation cost. An electric-powered gas heater also requires extra modification of your plumbing system. As it requires an upgrade to the electric line system.

These are the downside of a tankless water heater. 


In general, we can say that overall there are no dangers of tankless water heaters. By proper maintenance and abiding by the guidelines by manufacturers you can make your tankless water heater safer than any other water tank. If you find any misfunction or any problem with your tankless and unable to handle the issue, then just call Austin’s best plumbing company plumberson.

Related Post:

What Is A Cross Connection In Plumbing

Why is Copper Used in Plumbing

How to Calculate Plumbing Fixture Count

What is plumbing stoppage | Causes & Solutions

How to Install Slip Joint Washers in Plumbing

What Size Tankless Water Heater Do I Need

Does Tankless Water Heater Save Money?

How to Unclog a Bathroom Sink

How to Unlock a Navien Tankless Water Heater

Tankless Water Heaters: What To Do If You Smell Gas?

Leave a Comment

Your email address will not be published. Required fields are marked *