No, someone trying to BS you into a fat $$ job for them.
A 16 gague extension cord to the closest outlet to the stove should be more that adiquate, as long as it is NOT EXPOSED TO HEAT.
If it is /could be exposed to heat, the extension cord can still be used it is heat shielded
with sheet metal or a BX cable can also be used. BX cable is wiring inside a sheet metal shield.
I might add here,that I believe you would do better for your wallet, for many years into the future, to install a pellet stove or pellet insert, instead of a gas fueled heater.
I expect that the price of gas will lock step up with gasoline & fuel oil, $1.00 a year,every year
forever & ever until there is none left to sell at any price or we die of air polution or global warming , whichever comes first.
a pellet stove/insert is thermostatically controled from a wall thermostat, just like an oil or gas burner & auto igniting & with a 80 lb hopper (standard size hopper) never needs to be refilled with pellets more that once in a two day period, assuming a 24 hour non stop burn. geez, all the guy ask was an electrical question
Refueling takes 5 minutes including time for a 4 minute coffee break.
Pellet stoves have come a long way. Now they are push to start,set & forget.
Current price for 1 bag of 40 lb pellets $5.oo & lasts 24 hours of continious non stop burning
or about 4 to 5 days of normal heat, depending.
winter 08/09 expected price $6.oo bag
If money means anything at all to you, get the pellet insert instead of the gas insert ,because 3 yrs from now , you would have to swap out the gas insert for a pellet insert because of gas price increases.
I have read the writing on the wall for you,that you missed & I have my "I told you so's" safely stashed away in the closet , well wrapped up in plastic, so they will be fresh, in case of need. ;-P