If you run it on lp does it ever shut off? If in fact you have a "good flame" then the only thing I can think of might be a great deal of scale build up acting as an insulator on the heat exchanger/burner tube. When you replaced the anode did you flush out the tank?
I'm sure others will chime in with other ideas.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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