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I need a new 90% efficiency gas furnace. Replacing 25-year-old model, and need 90K-100K BTU unit. Any suggestions?

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I believe everything is built like **** today i suggest going for a system by goodman they are very inexspensive and really good warranties

Posted on Jul 28, 2009

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What size oil furnace is needed for 1200 square feet?


75000 to 85000 btu Or British thermal pound.
Two units of measure are important in sizing an oil furnace. The first is the British Thermal Unit or BTU, which represents the energy needed to raise the temperature of one pound of water by one degree Fahrenheit at normal atmospheric pressure. The input capacity of an oil furnace is often stated using this unit of measure. The second number is the fuel efficiency rating, which is expressed as a percentage. This represents the amount of energy that gets converted to heat, with higher numbers being better. To determine the energy output in BTUs per hour, multiply the input BTU by the efficiency rating. For example, a furnace with 100,000 BTU of input and an efficiency rating of 89 produces 89,000 BTUs of output. One with an efficiency rating of 80 and the same input amount, produces only 80,000 BTUs of output.

Read more: http://www.ehow.com/info_12197488_size-oil-furnace-required-1200-square-foot-house.html#ixzz2jfsuqLFx

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1 Answer

I've got a 23 yr old 30DV3 whose pilot light works, and the thermostat & heating element seem to work, but not well. With the thermostat set at full hot, it just barely throws out any heat at all. ...


As I'm sure you already know, Empire Comforts Systems, no longer makes that model heater and hasn't for some years, now. I mentioned that, because if your unit needs parts, they may be almost impossible to get. In any event, there are a several things that may be causing the problem.

  • Low Gas Pressure - Burner is not receiving enough gas. Check for obstructions and have gas pressure at the unit checked.
  • Clogged burner or air intake (venturi valve) is partially clogged. Clean burner ports and venturi valve.
  • Gas line Shut Off Valve at heater not fully open. Check Gas line Shut Off Valve.
At 23 years old, you've gotten your money's worth out of this unit and it may be time to replace it. Empire makes several Direct Vent Wall Furnaces that are rated as High Efficiency Furnaces. In the long run, the money saved in fuel cost, would be worth installing a new one.

Hope this helps you solve the problem.

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What is the efficiency rating on the Trane model BLU055E936B1 upflow furnace and what new furnaces are available to replace this old Trane furnace without having to change the venting system.


Chances are you need to replace both the condenser and furnace, then you you should get a varaible speed blower with the new furnace, get at least a 90% gas system with a 16 SEER condenser, save on energy cost as soon as it's installed. Go Get IT

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Coleman Gravity Floor Furnace need millivolt gas valve & pilot ki


Go to www.grainger.com and look for a "power pile generator" this is a millivolt thermocouple that may be just what you need to make your heater work again

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I'm considering installing a Goodman LP Gas Furnace:sizing? Ops?


Gerge, if you go to website www.energycodes.gov
you can do a heat load calc yourself. Basically, you figure out the sizes of walls, total area of glass. total doors to outside, ceiling area and types of building materials used. It is pretty easy and then you will know for sure. The contractor should be suppling you with one but if not use this, it is free!

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Code #33 on Bryant 355MAV 90i Furnace


'Limit or flame rollout switch is open'. In my case, the flame rollout switch had tripped due to an overheating? I had to push the button between the wire leads to reset the switch. Then when I turned the power back on, the furnace started up like normal.

Why did the switch overheat and trip? My current theory is that there was a rubber grommet around a pipe near the switch that had slid down and was no longer sealing the furnace?

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I have a 15 year old Coleman Propane 130,000 Btu force air furnace, Model #BGU13020 forced air furnace. Afer the unit runs for 5 to 10 minuets, the flame will start to shuter and then it will trip the heat...


DO NOT attempt to repair this yourself. LP gas is a very unforgiving gas. Sounds like your heat exchanger is plugged. Yes it can be removed and checked, BUT it is not recommended. Trust your local repair tech. Any heater 15+ years old should be discarded.

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1 Answer

Ruud Furnace needs replacement


What part of the country?
How many square feet in the house?
Insulation?
Single pane glass?
Many factors should be considered by a professional.
However if the old unit worked OK, a new 80% 70,000 unit will most likeley replace a 24 year old 60-70% 75,000 unit.

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