Internet #203653581

Model #S-150EDP

Sentry Natural Gas Boiler with 150,000 BTU Input 110,000 Output BTU Intermittent Electronic Ignition

  • Cast-iron heat exchanger ensures high performance
  • Heavy-duty motorized vent damper to save energy
  • Insulated jacket for added safety
  • See More Details

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Product Overview

Sentry is a hot water boiler heating system which is ideal for a wide variety of gas boiler requirements, as a replacement or for new installations. Its advanced design provides years of trouble-free, high efficiency operation while providing easy installation, even in sites with low chimney connections or low overhead clearance.
  • California residents
  • Advanced design cast-iron heat exchanger provides superior performance, longer life
  • Reliable, motorized heavy-duty vent damper saves energy
  • Insulated jacket
  • Brand name controls
  • LP conversion kit available for purchase separately OMSID# 2022783251 Model# 414-546
  • Purchase this unit in LP at your local Pro Desk

Info & Guides

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NameRRG Series 84% AFUE Natural Gas Water Boiler with 167,000 BTU Input and 122,000 OutputSentry Natural Gas Boiler with 150,000 BTU Input 110,000 Output BTU Intermittent Electronic IgnitionCondensing 96% Natural Gas Space Heating Floor Mount Boiler w/Optional Domestic Hot Water with 140,000 BTU InputM Series Natural Gas Condensing Boiler/Tankless Water Heater with 160,000 BTU Input
Save $299.20 (10%)
Fuel TypeNatural GasNatural GasNatural GasNatural Gas
Heat rating (BTU/hour)167000150000140000160000
Annual Fuel Utilization Efficiency (AFUE) (%)8482.49695
Heating Technology TypeRadiantConvectionRadiantRadiant
Ignition TypeElectricalInterrupted SparkInterrupted SparkElectrical
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Product Depth (in.)
19.75 in
Product Height (in.)
32.5 in
Product Width (in.)


Annual Fuel Utilization Efficiency (AFUE) (%)
Capacity (gallons)
Color Family
Energy Consumption (kWh/year)
Fuel Gauge
Fuel Type
Natural Gas
Heat rating (BTU/hour)
Heating Product Type
Heating Technology Type
Ignition Type
Interrupted Spark
Product Weight (lb.)

Warranty / Certifications

Certifications and Listings
CSA Listed
Manufacturer Warranty
Limited Lifetime

Questions & Answers


mono tee cast iron baseboards

Asked by a531 May 3, 2019

There is no issue using this boiler with a heat distribution system that is piped in monoflo. As with any boiler you want to make sure your near boiler piping is appropriate for the heat distribtion system it is supporting.

I have a three room house plus the living room, how many btu I need for a dream furnace

Asked by John November 25, 2018

The amount of heating capacity that needs to be installed in a home is not determined by the number of rooms. As I am sure you can envision the same home if located in Alaska would need more capacity than if it were located in Florida. The process of determining capacity is called a heat loss calculation. There are plenty of free programs on line you can use to do this calculation. You would enter information such as dimensions, window sizes, construction type, geographic location, etc. and it will determine the heatloss of the structure for the coldest hour of the coldest day of the year. Also I want to point out so there is no confusion you reference "furnace" in your question. A furnace is a device that heats air, whereas the product your question references is a boiler which heats water.

Are these set up for one zone or will it work for a two zone system

Asked by Matt November 24, 2018

Think of the boiler as the engine in the automobile. The auto may have an automatic transition or a standard. Those transitions may have a different number of speeds. But it is still the same engine. So to with a boiler. You can use this boiler in a single zone application or as many zones as you like. The number of zones would be determined by design and piping of the heat distribution system not by the boiler.

What is the flute size ???

Asked by sparky January 13, 2018

7" This as well as other dimensions are illustrated in the specification sheet. A PDF of which is located on the listing page for this product on the Home Depot web site. You will find it under info and guides.

it's for Steam radiators too ? How much it costs fort labor to install it? Thanks

Asked by Kevin May 30, 2017

This is a water boiler so it would not be appropriate for a steam application. Some boilers are designed to heat water and others are designed to heat water until it becomes steam. They are built either one way or the other. There are no combination units. I assume you need a steam unit so it would be sized based on both the BTU's and square footage of steam needed. I would need a lot more information to even hazard a guess as to the installation costs. .

I am looking to heat a cabin that will not always be heated in the winter can I use antifreeze in place of water?

Asked by Duncan February 23, 2017

Great question. Thank you for asking it and giving me the opportunity to answer it. Many people, including good plumbers, have unrealistic understandings of the non toxic glycol based antifreeze that is sold for hydonic systems. First, glycol does not carry heat. So you never run straight antifreeze. You add it to the system water until you reach the concentration that gives you the protection you need. Second, I tell people to look at it this way. Boiler antifreeze is a corrosive agent that becomes increasingly more aggressive over time; especially if not maintained. Ultimately it will limit the life of the system by attacking it from the inside. So in a perfect world you never want to use it. However what can be potentially more destructive to your quality of life is a freeze up. So boiler antifreeze is a trade off between the caustic properties of the product and possibility of a catastrophic freeze up. As a personal example I have radiant heat in my home and radiant tube in my driveway as snow melt. The snow melt system must have antifreeze because it is not always on. I put a heat exchanger between the two parts of they system so I could run anifreeze in the driveway but not in the house. In closing, boiler anifreeze is not a panacea. There are times you have to use it. When those times come, makes sure you use the correct product, in the correct concentration and that test its acidity and efficacy every year. You will find this means you will need to drain the system every so many years and replace the water and antifreeze. Don't add it and forget it.

What size unit do I need to heat a three family house and can I set it up with three zones

Asked by stick February 11, 2017

I would need to know a lot more about the structure in order to make a sound recommendation. I don;t want to risk making assumptions that cause you to make a bad decision. You are welcome to give me a call and we can talk about your system. Chris 978 651 3301

Can unit run on gravity

Asked by Gerry January 17, 2017

Chis had a great, albeit longwinded answer to your gravity system question. To paraphrase... Is it possible? Yes. Is it practical? No.

Can this unit power baseboard heating using pex tubing?

Asked by John December 20, 2016

I am not sure exactly what your question is. From your description you are removing a steam system and installing a water system. I can;t think of anything from a steam system you would be able to reuse so you are essentially installing a new system. PEX is not standardized like copper tube, so you will need to pick a system/manufacturer to use. A best practice that people over look is that water pex can not be used on closed loop heating systems. It lacks an oxygen barrier. So air will defuse through the wall of the tube and destroy the ferrous metals, such as the cast iron boiler. Some will argue this is a myth. It is not. Use a good quality heat pex, meaning a pex with an oxygen barrier.

I have 1650 sq feet home, what size hot water gas boiler I need. ? How many BTU capacity I need?

Asked by Kt November 19, 2016

i have 170 sq feed besebord what size gas boiler i need

Sentry Natural Gas Boiler with 150,000 BTU Input 110,000 Output BTU Intermittent Electronic Ignition - page 2

Customer Reviews

  • 3 Customer Reviews
  • 4.4 out of 5 stars overall
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Milwaukee, WI, USA
Product keeps the house warm even below zero
Working like it states on package. It is keeping us warm in the below zero temperature in Milwaukee, Wisconsin.
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Love it!! Pricing is just right! I had a contractor...
Love it!! Pricing is just right! I had a contractor put it in, so didn't have to get into the gritty part of it, but we're enjoying the heat and loving it!
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