Sentry Natural Gas Water Boiler with 120,000 BTU Input, 88,000 BTU Output Intermittent Ignition

The GG aka Galaxy was a series of boiler and included many variations in both steam and hot water. I would need the information from the rating plate, complete model number and complete serial number. With that information I would know exactly what you have and could offer an educated opinion. But with only the information GG100 I can only tell you it utilizes the Galaxy casting and has an input of 100,000 BTU's. Please feel free to give me a call. Chris 978 651 3301

I an sure you would appreciate a yes or no answer. But unfortunately I can not offer you that. If your state, local community, inspector or mobile home park requires products to have specific certification for use in a mobile home, I can tell you that this product does not have that. Further I can say that I have never heard of a boiler designed specifically for a mobile home or a mobile home that had a boiler. Meaning mobile homes do not typically have forced hot water heating systems. Every mobile home I have ever encountered has utilized a furnace. Ductwork under the floor ties back to a forced hot air furnace typically located in a closet. The most common furnace used are the ones sold under the brand name miller. If you home does have a boiler, I would put your question either to the inspector or a qualified licensed contractor.

Before I answer your question. If you are dividing this boilers 88000 BTU output into its 120000 BTU input and thinking that is your efficiency you are in error. AFUE (annual fuel utilization efficiency) is DOE Capacity (Department of Energy) divided by output. So for this boiler that would be 88000/101000 or 84.1%. Output is the value of the energy in the water that can be used to do work. DOE capacity adds back in the heat that leaks out of the boiler and system piping into the house. Why? Because that heat is not lost. Its still in the house and is part of the system. Now to the rest of your question. A chimney is not an exhaust pipe. A chimney is a machine, with few if any moving parts. It acts like a super charger and pull in the tremendous amount of air needed when combusting fuels. In order for the chimney to operate you leave roughly 16% of the air in the flue gas. 100%-16% means you end up with an efficiency of roughly 84%. The laws of thermal dynamics are not new. Engineers knew hot to a make a 99% efficient boiler over a hundred years ago. They did not do it on purpose. And even today you choose high efficiency because you want it, not because it will pay for itself. I have a 98% efficient unit in my home. I am on my third one in 10 years, and I do this for a living. I don't regret my choice because I knew what I was getting into. Why do the boilers fail quickly? When you burn a fuel you are oxidizing a hydrocarbon. Hydrogen and oxygen become water. What comes out of the chimney is in a large part water; and same with the exhaust pipe of your car. You don't see the water because you left 16% of the heat in the flue gas. That heat kept the water in the form of invisible steam. High efficiency boilers, such as mine, try to remove as much heat as possible thus the boilers exhaust is water; known as condensate. This condensate is acidic because it contains other biproducts of combustion. It will eat into the internal materials the boiler is made of . The PH also needs to be neutralized before it is put into drain lines or it will rot them out much faster than people realized. So in answer to your question. Chimney vented boilers at 84% heat extraction are as efficient as they can be and still use a chimney. Yes you can chase the lions share of the remaining 16%. But the negative impact on reliability and life expectancy make that less of an economic choice and more about what you want to have for a carbon foot print. If you have further questions you are welcome to give me a call. Chris 978 651 3301

This boiler doesn’t use a draft hood. It has a glue collector/ diverted assembly at the back of the boiler.

Boiler is 32-7/16” tall, 28-1/2” deep including the flue collector on back, and 17-1/8 wide.

The flue is 6 inches

This slant fine EDP-120 doesn’t use the old Honeywell relay type controls instead it utilizes a Fuel Smart HydroStat control circuit board with L.E.D. Read out. High and Low limit, low water cut off and built in economize are all incorporated into the control.