My home electrical power went out during the Storm Sandy. I switched over to my generator for power. I used the generator to run my furnace. My furnace is a two year old Lennox 2 Stage Gas Furnace. I was told by rhe company I purchesed the furnace off , NOT to run the furnace of the generator.I will cause harm to the generator. I need to install a ($1,500) device to allow my furnace off the generator.
My question is:Is this true. Does the generator send a different type of electricity to the furnace then my regular home electrical current from the power company. How can the furnace tell the difference between the two currents, I though they were the same. Thank you very much. Fred NJ USA
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The furnace will not harm the generator, but the generator may harm the electronics in the furnace.

I am very curious as to what this $1500 device is they are talking about.

[QUOTE=stanfortyman;3389780]The furnace will not harm the generator, but the generator may harm the electronics in the furnace.

I am very curious as to what this $1500 device is they are talking about.[/QUOTI am sorry I meant will the generator do damage to the furnace?
I don't know what this device is. What type of harm can the generator cause to thegenerator?

Many generators produce "dirty" power. Meaning the frequency, etc, is not as stable as utility power. Sensitive electronics cannot withstand this instability.

Pretty much all newer furnaces and boilers have some sort of electronics.