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Home >> Plumbing >> Slant Fin Vs Weil Mclain Boilers: The Ultimate Comparison

Slant Fin Vs Weil Mclain Boilers: The Ultimate Comparison

When you live in a country with cooler temperatures, having a reliable boiler in your home is essential. You have undoubtedly heard about Weil Mclain boilers and Slant Fin boilers when it comes to the best of the best. Well, these boilers have some major weaknesses when compared.

So, Slant Fin vs Weil Mclain boilers, which one is better? Each of these has its own strong and weak points. To cut things short, Slant Fins are the way to go if you are seeking longevity, whereas Weil Mclain is the way to go if you are looking for a cheaper one.

However, you shouldn’t only be dependent on these factors. There are other factors, such as efficiency and the type of fuel they use, that is important to consider. Additionally, good numbers don’t mean one is better than the other, there are hidden components attached to it. Let’s check them out!

Slant Fin Vs Weil Mclain Boilers: Comparison Chart

Slant Fin Vs Weil Mclain Boilers

What can be better than a comparison chart where you get to revise what you have just read? So let’s get through everything again!

Slant FinWeil Mclain
Made out of alloy steelMade out of casting aluminum
Long-standing 30 years of longevityAt least 15 years of longevity
82 percent AFUE efficient85 percent AFUE efficient
ExpensiveCheaper than Slant Fin
Established in 1949Established in 1881
Provides a free 10-year warrantyProvides a free 10-year warranty
Can be used with oil and natural gasCan be used with oil and natural gas

 Earliest In The Market

Experience in the field does matter. As they say, with great experience comes great knowledge. However, when it comes to Slant Fin and Weil Mclain, the Weil Mclain has been around way longer.

Weil Mclain started their journey in 1881, whereas Slant Fin started in 1949. Even though both of them are doing innovations in the boiler market, it can be concluded that Mclain is doing better. As a result, you can expect better working features on these boilers.


Another crucial element to consider is durability. Since you will be spending a ton of money on buying a boiler, there is no compromising on its durability.

The Slant Fin boilers promise a snapping 30 years of expected life expectancy. They are confident in themselves with the highest quality of alloy steel to withstand high pressures and extremely high temperatures.

On the hand, cast aluminum is used in Weil Mclain boilers and ensures us 15-year longevity at a minimum. However, with proper maintenance, they are able to compete with the Slant fin boilers.

Additionally, there are different levels of warranties available for years if anything goes wrong with both of them. We will dig in deep on this topic later.

Type Of Fuel

Aside from the fact that they are both boilers, they also accommodate both natural gas and oil. As a result, you wouldn’t have to worry about a thing if one of them won’t endorse oil or gas.

Nevertheless, when it comes to gas, you can only use natural gas or propane gas. It’s obviously quite handy because you will always have an option, regardless of where you reside, and whatever energy source is more expensive there.

Price Points

When it comes to price points, Weil Mclain is the better option here. If you are looking for a boiler that is price efficient as well as lasts long enough, then there is no better alternative than Mclains.

On the other hand, the Fins are in the higher price point category. It’s mostly due to the excellent build quality and super longevity.

However, that doesn’t make McClain’s build quality bad. They will undoubtedly endure long enough for you to be happy with the outcome.


You are paying big bucks for these boilers, so it’s a responsibility for both brands to provide you with a good warranty. Yes, they did, and you will surely be happy with it. Here’s what both of these companies’ boiler warranties look like;

companies’ boiler warranties

As you can see you will be relieved for 10 years. If anything goes wrong in the first ten years, then you wouldn’t have to spend a dime to claim a warranty.

On the other hand, as years go by, the percentage of the total amount will be added. Thus, needing to pay a percentage to claim the warranty.


Before we get into it, you have to know how efficiency is measured in boilers. It is measured in Annual Fuel Utilization Efficiency (AFUE). Additionally, it’s somewhat similar to miles per gallon, or MPG, for automobiles for furnaces, and boilers. Simply put, a gauge of how well a furnace turns the energy in the fuel it burns into heat for your house.

In terms of efficiency, the Weil Mclain wins as it has managed to mark itself at 85 percent AFUE points. On the other hand, Slant Fin provides you with an 82 percent AFUE efficiency rating.

The difference might look small but is certainly capable of saving you some bucks.


To conclude, that was all for Slant Fin vs Weil Mclain boilers. We can say for sure that both of them are great at their fields and gives each other the utmost competition. Now it’s up to you to decide which one seems more convenient for you. You surely don’t have to worry about a warranty with both of them.

However, the build quality and price are something to consider. The Fins are just better at lasting, whereas Mclain’s are outstanding at providing a reasonable price. Additionally, more efficient than the Fins.