Slant-Fin Sentry Boilers

Slant-Fin Sentry Boiler Overview

The Slant/Fin Sentry is a gas hot water boiler with an efficiency of 84.4% AFUE. The unit’s thermal targeting technology is designed to save on fuel by monitoring heat demand. A thermal pre-purge option is also designed to conserve fuel. The unit features a display which shows the boiler water temperature and boiler control’s setting, and LED lights help monitor the system. The Sentry’s insulated jacket is designed to prevent heat loss and provide quiet operation.

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Consumer Reviews of Slant-Fin Sentry


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #3 of 7 Slant-Fin Boiler
  • 96.88% of customers recommended

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Slant-Fin Sentry Boiler Reviews

Showing 1-5 of 32 reviews

"New Boiler – Works great."

5.0 rating
Very Satisfied

I have just recently purchased this, as I was replacing the furnace and A/C system. A new boiler was within my budget, and I have had good experience with previous systems. I would definitely consider buying the brand again. I would probably buy a bigger system, as my family is getting larger and having a higher capacity system is definitely within my reach, but I do believe that it should be good for awhile. I can't really complain about the system, as it is still new. It heats my water sufficiently, and its energy efficient. It's great. I would definitely recommend the brand, as it works great.

Chicago, IL

"Love my Sentry boiler"

5.0 rating
Very Satisfied

I have owned my boiler for 1 year. It works well and and is more energy efficient than the previous one. Installation was easy and haven't had any problems with it. Would recommend product and buy another one if needed.

Belleville Illinois

"Great new boiler"

5.0 rating
Very Satisfied

I originally purchased this boiler back in 2013 and it has been a great addition to our family home. I like that is has lasted so long. Our last boiler went very quickly and this product was bought as a replacement. It does very well at maintaining a comfortable temperature throughout the entire house. Usually it's kept between 68 and 75 degrees. This product has not been serviced thus far. Typically my family and I invest in cheaper boilers. However we end up having to pay a lot of money for services and replacements. However this product has lasted 3 years now with no issues. Thus saving our time and money. I would definitely recommend this product to any individual looking to buy a boiler its durable and you cant beat the price. I guarantee it is worth the buy and easy to install. Definitely worth it!

Haverhill, MA

"Sentry Intermittent Ignition Natural Gas Water Boiler is a great buy!"

5.0 rating
Very Satisfied

I have had this boiler for about two years, installing it when we moved into our new home in 2014. I thought the price (around $1500, but we got a discount as part of a Home Depot New Years sale) was a good deal. It is very sturdy and made out of cast iron I believe. It seems to be quite energy efficient, and I think this can be credited to the intermittent electronic ignition. Our last house had electric heat, so using a natural gas boiler now seems to save us a lot of money. My mother has an oil furnace in her basement for comparison, and it is far taller and takes up a lot more space than this boiler. I find the size to be very accommodating. The installation was also very simple, and my husband and I had it installed in our basement rather quickly. I am no expert in boilers, but I am happy with this purchase.

Worcester, MA

"Sentry Boiler Is Fantastic"

5.0 rating
Very Satisfied

We have only owned this boiler for 9 months but so far it has exceeded our expectations. Installation was easy and only took a few hours. We save quite a bit by using this natural gas boiler as opposed to the old one we used to have. We have had no issues with this boiler so far and I would definitely recommend it to anyone looking to go the natural gas route in the future, you will definitely save money on your bill. Natural gas is cheap right now and should remain very affordable for the foreseeable future so it is a great time to replace whatever you have with a natural gas boiler like this one. It also feels good knowing you are using cleaner energy as opposed to traditional heating oil, so that's another benefit. Definitely can be installed yourself if you know what you're doing because this is a package kit that comes with everything you need, knock it out in an afternoon and you'll be happy you did when the bill comes

Pittsburg, PA

Other Sentry Reviews

Based on comments from online HVAC forums, the Sentry is regarded as a good unit. Consumers on and had problems with their Sentry boilers not heating correctly that were both determined to be caused by a circulator and not the unit itself.

Sentry Warranty

The warranty for the Slant/Fin Sentry boiler is comprised of the following:

  • 1-year warranty on parts
  • Lifetime limited warranty on cast iron sections, prorated after the 10th year

Labor and shipping costs are not covered by the warranty.

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