Hi Arthur, we ended up replacing 3 of the 4 on our 54. I think a lack of TLC and running them 24 /7 had taken the life of the units away. The original unit works well . The new units are great too and the newer controls also help. The water pump was also changed as it was plumbed to service all the units. I would do it differently in the future having two pumps with the ability to split the load. On the list but buried on page 14[emoji15]
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Best,
Paul
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