How many BTUs per hour will natural gas and propane lanterns use?

Series 1 & 2 natural gas lanterns use 3451 BTUs per hour; series 3 natural gas lanterns use 4854 BTUs per hour. Series 1 & 2 propane gas lanterns use 2800 BTUs per hour; series 3 propane gas lanterns use 4854 BTUs per hour.