The patented Electro-Mate® zero-clearance electric conversion system converts your existing natural gas, LP, or oil furnace into a "Dual-fuel" (electric/gas-oil) system. Having this ability to use lower cost electric rates and by using the most cost effective heating source available can save you hundreds of dollars off of your heating bills each year. To understand the true cost of energy for your heating system view the electric vs. gas/oil chart. With electric's 100% efficiency you will be able to get an idea of the cost savings available by using electric's off-peak rates.