The end cap from the tank hit Seitz, 26, killing him, authorities said.
A second fireman with the McArthur Fire Department, Aaron Chesser, was injured in the blast. He was taken to Adena Hospital in Chillicothe to be treated.
About 30 homes in the Londonderry area, on state Route 327 between U.S. Route 50 and Poes Run Road were evacuated because of the fires.
Those residents were allowed to return to their homes on Friday night.
Firefighters said passing rain showers helped them knock down hot spots, but crews were keeping their eyes out for possible flareups.
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