==> Follow this & fix your Water heater leaking from top

by jessica | Last Updated: May 20, 2020

Your hot water tank is leaking from above, don’t panic! Rest assured Bob! provides you with all the information you need to manage this situation in the best possible way. But also as the saying goes “it is better to prevent than to cure”. Thus, you will be able to know the main origins of your escape!

First of all if you come across this article and a leak has not yet occurred at your place (great!), We advise you to learn the little everyday gestures in order to properly maintain your water tank hot .

Did you know that descaling your hot water tank must be done every 4 years?

That it is necessary to operate the valve on the safety block every 6 months?

And especially that the security group is to be replaced approximately every 5 years?

Indeed, ensuring the proper functioning of your hot water tank improves its lifespan while allowing you to save on your energy bill. Most importantly, it helps keep you and your loved ones safe!

Finally, in general, limestone is the main cause of failure or leakage for a hot water tank. Regions with high levels of limestone in the water present greater risks, maintenance is therefore essential.

In order to reduce the risk of breakdown and to insure yourself in the event of a disaster, a hot water tank is serviced annually. This maintenance makes it possible to check the correct functioning of your hot water tank as well as its condition. Indeed, it prevents the risk of corrosion by checking the wear of the anode for example.


Your hot water tank is leaking from above because the tank is pierced

Your hot water tank is overflowing from the top, it has surely had its day. In fact, the average lifespan is 10 years. This is why when you notice a leak from above, it is probably because your tank is rusty, punctured or cracked.

In addition, when the hot water tank is old a corrosion point can form at the weld of the water inlet or outlet, which explains the infiltration of water when it is under pressure.

When your hot water tank leaks from the top vent it is pierced, then the water flows and often drips because the tartar has pierced the tank. This means that the replacement of the water heater is compulsory!

A leak from the top of the hot water tank at the water supply seal (flange)

If your balloon leaks from the top, but the tank is not the source of your problem. It is quite possible that the flange seal has blown.

There are cases where customers were certain it was pierced but it was just a hot water pipe joint that had pierced. Before embarking on a replacement water tank, involve a plumber to analyze the assembly and check if it is not just a joint or a fitting.

However, during heating during off-peak hours, generally during the night, the water pressure must come out and too high a pressure can damage the seal. It is recommended to use a pressure reducer in parallel.

Why is water coming out of top of water heater?


The electric balloon is a frequent heater in an apartment or house. Its greatest enemy is tartar, that is to say the limestone that forms in the cumulus tank. The older the water heater, the more scale builds up. Descaling is then necessary to avoid the breakdown of the electric cumulus.
The electric balloon is sometimes connected from above to the sanitary piping. In this case, the scale can also be deposited at the level of the pipe fitting and sometimes deteriorate the junction made from a joint or tow, for example.
If the balloon leaks at this level, it is important to call a heating technician to descale the tank and then refurbish your piping. Indeed, the scale that is in the water supply may reduce the incoming flow over time while increasing the pressure. The more pressure, the greater the risk of damaging the mains water supply flange seal.


The pressure in the tank of the electric water heater increases when the water is heated by the electric resistance, which in turn is controlled by the water heater thermostat.
An expansion tank absorbs the pressure of the electric balloon, thanks to its internal membrane. The electric balloon safety group maintains the pressure below 7 bar and ensures the correct operation of the cumulus.
Sometimes the security group freezes or also undergoes tartar. In this case, it is impossible for him to play his role. The overpressure in the tank then sends the water out where it can, so sometimes from the cumulus membrane located at the top rim of the electric water heater when the connection is made from above.
To prevent the safety group from jamming, it is advisable to handle this water heater spare part once in a while. Descaling also remains the only solution against limescale that forms at the level of the safety group for electric cumulus.


In the case of a pierced water heater tank, tartar is still the culprit! Limestone is fought by the sacrificial anode as long as it is able to protect the electric cumulus . Once the anode is exhausted, nothing can prevent the scale from settling in the electric balloon.
In this case, the tartar attacks the walls until piercing them. Once the tank has been pierced, the water escapes from the water heater and all you have to do is change your appliance.
To save the electric balloon from such a disaster, consider changing the water heater anode and performing descaling once a year. Thanks to these two actions, the heating of domestic hot water will be better and the lime will disappear.