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Not sure what model you are referring to. I did not know that On Demand Water Heaters were even an option in 5r. We are seriously looking at a Montana for our first rv purchase. I can possibly give you an idea on the shut down. Most on demand units will call for a minimum flow rate to keep the burner on. Pressur input or restricted flow anywhere. I once had our outdoor shower have the same issue. It turned out the hand shower want had a crimped hose. Fixing that solved the issue.
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