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Old 09-14-2010, 07:16 PM   #1
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Garage Heater Change


Just installed a 75,000 BTU 'Heat Star' garage heater. It borders on overkill and this question came up: would it be feasible to remove the burner orifice (top would be my choice) from one of the five and simply plug it. It would have the effect I think of making the 75K into a 60K. Anyone have experience with this? Advice/thoughts? Thanks, Saltmines

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Old 09-14-2010, 07:22 PM   #2
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Garage Heater Change


I would not do it. The heat exchanger is designed to be heated evenly by all the burners. Remove one and it will expand and contract improperly and could fail prematurely/become dangerous/void the warranty/cause insurance co. problems if there is a fire and you tampered with it/voids the AGA and UL approval. The ventor/exhaust fan is designed to handle a certain amount of exhaust fumes and decreasing them could cause problems also.

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Old 09-14-2010, 08:41 PM   #3
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Bad thing to do. causes troubles down the road.
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Old 09-18-2010, 03:46 PM   #4
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Garage Heater Change


Hi Beenthere, I certainly appreciate your input...but I was wondering if you could be more speciic? Every action causes reaction down the road, troublesome or beneicial or neutral. Benefits to such a change could be reduced cycling and a 20% reduction in quantity of fuel burned. Member Yuri mentioned that the heat exchanger is designed to be heated by all burners evenly. Seems to me that if one burner out
f five is removed from the 'heat exchanger' the remaining four would heat the remaining chambers (a four tube heat excnanger) evenly, and in effect become a 60,000 BTU heater. Do 45K, 60K, and 75K heaters actually use a different CFM exhaust fan? Would 20% change this way or that really cause havoc? Not meaning at all to be disrespectful, but curious. Thanks, Stephen (Saltmines)
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Old 09-18-2010, 04:07 PM   #5
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The exhaust fan has a restrictor hole/orifice behind it and or it is sized and designed to the amount of flue gases produced by 5 burners. 4 burners = less fumes=more draft over the burners which may lift the flames off the burners or cause improper combustion or delayed ignition etc etc. ANY changes you make negates the UL and AGA certifications.
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Old 09-18-2010, 04:34 PM   #6
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They are tuned, buy orifice or restrictor plate as Yuri said.

So you would make your furnace combustion characteristics change. And end up with poor combustion.

That why manufacturers don't just make a 150,000 BTU and say just plug the orifices you don't need.
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Old 09-18-2010, 06:31 PM   #7
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Hi Yuri and BeenThere,
Your advice seems sound to me, I'll not tamper! Chances are when the heating season is here all will be fine and should there be a problem, will deal with it then. Your input is very appreciated. Best, Saltmines
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Old 09-18-2010, 08:57 PM   #8
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Your welcome.

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