optimus 123SVEA 123 stoves = 4,700 BTU'd Optimus 8r, and 99 = 3,300 BTU's. My own experience with both stoves seems to easily show the power difference between them. AsHere is an in-depth review of the Optimus Svea 123 stove. I go over the features of the stove, do a boil test, and pare the weht with a more modern back...