Your Cast Iron Furnace - Replace or Remove?

Keeping your home warm and cozy in the winter is important. Whether you live in an old drafty Victorian or a brand-new condo, having a reliable source of heat is critical to keeping your house comfortable.

Your cast iron furnace is important to your home’s heating system. It uses heat from the burning of fuel oil to heat your home. The furnace is in a location that is easily seen and accessible for servicing.

But what happens when your furnace needs repair or maintenance? Do you remove it and have it repaired, or do you keep working on it and risk having it break again at any time?

You have a few options for repairing your cast iron furnace, depending on how much time and effort you want to put into fixing it. Here are factors to consider when deciding whether to remove or replace your cast iron furnace:

Heat Consistency

Heat consistency is the first thing to consider when deciding whether to remove or replace your furnace. The consistency of heat your furnace produces is an important factor to consider. An old cast iron furnace may not be able to produce consistent heat.

If it has been sitting unused for a long time, it may not work as well as when it was new. Having a reliable source of heat is important, and you do not want to risk having your house too cold when you need heat the most.

When the temperature of your home is set at a certain temperature, you want the heat to be consistent throughout your home. If your furnace is not producing consistent heat, it may not be able to meet the needs of your home.

When a furnace is old and not producing consistent heat, you should consider repairing it. If the problem persists, you may consider replacing it with a new furnace.


Your furnace's performance is also a good indicator of whether or not it should be replaced. Cast iron furnaces are known to produce excellent heat and are much more efficient than other types of furnaces.

They are also very durable and can last for years without needing much maintenance. Rusting is one of the biggest problems cast iron furnaces to have when it comes to performance. It is not uncommon for cast iron furnaces to rust over time, and this can cause them to lose their efficiency.

If your furnace has rust beyond repair, it is recommended that you replace it. If you have a rusted cast iron furnace but still have problems with performance, like losing heat or stalling, you can try to repair it. You should also ensure that you regularly clean the vent system of your home to prevent further deterioration.


Cast iron furnaces take longer to heat up and are usually more inefficient. Energy efficiency is a major concern with cast iron furnaces because they use more fuel oil than other types of furnaces. To heat your home, you must use more fuel oil than you would use in a gas furnace or electric furnace.

In addition, cast iron furnaces have poor airflow and often require more time to heat a room. This can lead to more drafts and cold spots in the room. Some components in a cast iron furnace are also more difficult to maintain, requiring regular cleaning and maintenance. This can be a major inconvenience, especially if you have a family and must keep the house warm.

However, this does not mean all cast iron furnaces will be identical. Some older furnaces may not be as efficient as newer models. If your furnace loses efficiency over time, it is a good idea to consider removing it.


Your cast iron furnace is designed to last for a long time. Most furnaces are designed to last for 15-20 years. The average life span of a furnace is 20 years, but some will last longer than that. If you have a newer furnace, it may be more reliable and easier to fix than the older models.

However, newer furnaces are more expensive to buy and can be more difficult to repair if something goes wrong. An old furnace may not have been properly maintained over the years and needs repairs or maintenance on its parts or internal components.

The costs of replacing your cast iron furnace are high compared to repairing it. A properly maintained furnace will work well for many years without any problems.

Replacing your cast iron furnace is also more expensive than fixing it. However, if you decide to replace your furnace, you can save money by getting a new one instead of a repair.

Your Personal Preferences

You may have a preference for whether to remove or replace your furnace. Some people prefer to keep their furnaces in place and not alter them at all. Others like to take them out and replace them with a new, more efficient model.

Keep in mind that many different models of furnaces are available, so you can get a high-performing one or one that is more economical. It’s also possible to get a unit that is more than one piece, such as a furnace and an air handler.

Your furnace’s age

If your furnace is more than 20 years old, it is time to replace it. The cast iron parts inside your furnace won’t last forever; eventually, they will become damaged or worn out.

If you have a cast iron furnace with a lot of rust on the sides and around the heat exchanger, the steel in the furnace is rusting and will eventually need to be replaced. If your furnace has a lot of rust or there are holes or cracks in it, this means you should probably replace your furnace.

If you keep working on it when it breaks down again, you’ll be spending a lot of time and money on repairs. It’s much better to replace it with a new furnace; it will last longer and save you money in the long run.

Replacing your old furnace with a new you get one that is more advanced in technology. A new furnace will give you the latest and best features that will help you reduce your energy consumption and save money on your heating bill.

Contact The Boiler Shoppe

Toronto & Area:
1255 The Queensway, Unit 11
Toronto, ON M8Z 1S1
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