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When Should I Replace My Ducted Gas Heater?

When Should I Replace My Ducted Gas Heater? | Lexity

Ducted gas heaters are fantastic pieces of kit that can provide you with incredibly efficient heating during the colder months, but as with any appliance, there will come a time when it needs to be replaced.

Unfortunately, the lifespan of most appliances is not indefinite, and sooner or later, every single one will need to be replaced, whether it’s an air conditioner, heater, or refrigerator. However, identifying when this is going to happen can sometimes be challenging. Here are some common indicators that suggest you need to replace your ducted gas heater:

The Ducted Gas Heater Doesn’t Turn On

If your ducted gas heater doesn’t turn on, that’s a pretty good indicator that it’s broken, and not much more investigation is required. However, you can check a few other things before deciding to replace it. Ensure that the thermostat is set to “on” and that the circuit breaker has not tripped.

If the thermostat is set to “auto”, then the heater won’t switch unless the temperature drops below the setting on the thermostat. The circuit breaker may have tripped if the heater draws too much current. This is particularly likely if you have a wall-mounted heater, as these have been known to trip due to faulty wiring or a poorly installed thermostat.

Improper Installation

It’s possible that your heater isn’t broken; it could just be improperly installed. If the installer did not install it correctly, it could leak air or water. That can result in the heater being starved of the resources it needs to work correctly.

In addition, you may have been given inadequate advice on using your ducted gas heater, which could lead to a shorter lifespan than necessary. If you’ve recently had a new heater installed, then it’s a good idea to double-check the installation to see if any potential issues could cause problems in the future.

Condensation Has Formed Inside The Ducted Heater

If you’ve noticed a lot of condensation inside your ducted heater, this could be a warning sign that it’s nearing the end of its life. This is because when the internal components of a heater begin to wear out, it’s usually a sign that the gas flow is decreasing.

This results in a drop in the temperature inside the heater, which can sometimes lead to the evaporator freezing and causing ice to form on its exterior. When this ice melts, it drips down the inside of the heater, and if there’s a constant flow of condensation, then this could be a sign that your ducted heater is nearing its end.

Your Ducted Gas Heater Is Over 10 Years Old

Although every manufacturer will have their own recommended lifespan for a ducted gas heater, in general, if your heater is over ten years old, you might want to consider getting a new one.

Besides the fact that ducted heaters are usually only designed to last for around ten years, it’s also important to note that manufacturers often stop producing parts for old models, meaning that it can be challenging to find a technician to repair them.

You Experience Constant Repairs

If you’ve had your ducted gas heater for a few years and it has been fine, but you’re suddenly experiencing constant repairs, this could be a sign that it’s nearing the end of its life. Although it can be challenging to predict how long a specific appliance will last, it’s probably safe to say that if it’s been constantly breaking down, it’s probably time to replace it.

It’s Loud, Or There’s A Burning Smell

If your ducted heater is particularly loud or there’s a burning smell, this could be a sign that something isn’t right. Unfortunately, it can sometimes be hard to pinpoint the root cause of the problem, but if you’re experiencing any of these issues, you should check it out with a professional as soon as possible.

Although a loud humming noise may not indicate a severe problem, if your ducted gas heater is making a lot of noise, it may be trying to compensate for a problem that needs to be addressed. Similarly, something is likely wrong if there’s a burning smell coming from your ducted gas heater.

Ducted gas heaters are designed to run extremely hot; over time, they tend to build up a layer of grime inside the system. If you notice that your heater is making a lot of noise and there’s a burning smell coming from it, then it’s possible that you need to get it checked out by a professional.

In many cases, it’s filled with dirt and needs to be cleaned out. Ducted gas heaters should always smell a little bit like gas, but if the smell is too strong or there’s a burning smell, it may be worth having it checked out before it becomes a severe problem.


This article has shown you when you should replace your ducted gas heater and when it might be time to get a new one. However, it’s important to remember that these are just general guidelines, and your ducted heater could break down anytime. When it does, it’s essential to get a new one installed as soon as possible, as it’s much better to get a new ducted heater before it even breaks down than to wait until it’s broken and try to get a technician out to repair it.


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