The GB series come with a 24 volt electronic flame safeguard system employing the flame rectification for flame detection.  These units use 24 volt valves and controls which are smaller than 120 volt controls yet still allow use of the 120 volt operating controls if needed.

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The 56B unit offers a min. input rating of 300,000 BTU/hr. and a max. input rating of 1,075,000 BTU/hr., the 57B offers a min. input rating of 300,000 BTU/hr. and a max. input rating of 1,500,000 BTU/hr., the 58B offers a min. input rating of 500,000 BTU/hr. and a  max. input rating of 1,850,000 BTU/hr., and the 69B offers a min. input rating of 800,000 BTU/hr., and a max. input rating of 2,500,000 BTU/hr.

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