Main HE A Heat Only Series. Main Heat Only ErP Series (Serial No. Ending in AC / BC). 12 HE A Heat Only – GC No.41-467-16. 15 HE A Heat Only – GC No.41-467-17. 18 HE A Heat Only – GC No.41-467-18. 24 HE A Heat Only – GC No.41-467-19.
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