View Full Version : What is a Modulating Furnace?
10-26-2006, 01:07 PM
I have read the term here multiple times but never really thought about it. Now that my house is cold instead of hot my interest is peaked.
10-26-2006, 01:18 PM
No details but...
Basically a furnace with a gas valve that regulates the operation of the unit to provide higher effeciency ratings. For instance, you could fire up in heat mode with the gas at 100%, and the valve would lower the amount of gas being supplied to the most efficient level. Depending on which type of blower you are using, higher energy efficiency ratings can be achieved via the combination of blower and mod. gas valve, as compared to the mod. gas valve alone, or with a certain blower. They are usually quieter than some other types of furnces.
10-26-2006, 01:30 PM
the biggest thing is the comfort you can get out of it
will keep the temps alot more even expecially during the spring and fall which is most of the heating season in many areas
10-26-2006, 02:54 PM
So if I understand this right. A modulating furnace can vary the amount of gas going into the combustion chamber as opposed to a standard furnace in which it's either gas on or gas off. Is this right? Also are these available for Propane as well.
10-26-2006, 03:03 PM
hank hill would be proud :D
and yes you can get that in LP (propane)
10-27-2006, 09:31 AM
Basically the units gas supply and blower speed changes to meet the heat loss of the house. The Rheem/Ruud version uses a proven GE ECM motor that maintains a constant CFM even on the lowest speed to ensure the required airflow at the lower speeds of heat (which is just a waft of air out of the registers at low speed). This is critical as the filters accumulate dirt and start to restrict airflow. Since it gives just enough heat to meet the need it will maintain a constant temperature with no detectable noise, no on-off cycles with the up and down temperatures associated with conventional units.
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