I was a Aqua Hot Tech since 2009 I retired last January, But I don't mind helping out. Kent you have a Hydro Hot probable HHE 200-08E or close to that, The AHE-400 and 450 replaced the Hydro Hot,same foot print both 5 gallon boiler tanks. The 400 is a striped down 450, Does not have stir pump or engine per-heat which does 2 things 1st 450 will warm up Diesel engine before fire up 2nd Engine heats Aqua Hot driving down the road,no pumps or burner, for that you can run Aqua Hot heat running down the road. and the 400 uses #2 pump for stir pump. 400 is a good unit just less bells and whistles, I've replaced a lot of Hydro Hot's because of boiler tank failure.
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Art
97 Prevost Royale 40 foot
470 HP Detroit Series 60 four Stroke
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