Gas Pool Heater Set-up Question....? We have an above ground swimming pool next to a gas heater....

We have an above ground swimming pool next to a gas heater. I newly received a gas bill for $1200 and when I called, the gas company told me that it be from unbilled pool heater usage. Two days previously that I received a gas bill for $1083. Is it possible that my pool is on a seperate line/account? or does this sound similar to something that I need to appropriate a little bit further? It does not brand sense to me. Do any of you have pool heaters on seperate lines from your regular home dash?
Answers:    Do you have more afterwards one gas meter ?, If no. Then you shouldn't be getting a separate bill.
In my opinion pool heaters are a wast of money, gain a good solar blanket and it will do merely as good of a livelihood (especially with an above ground pool)
gas lines are subjected too like line ,and the electric would be on an seperate circuit.