ERGOMAX INDIRECT

and your boiler's got enough BTU's, you should never run out of hot water. I think taking the tankless coil and putting in an insulated tank is a great idea. No sulfer odor, no bacteria growth. I hear the Ergomax's are pricey and most models sized for comercial use. I don't understand why the smallest model uses 1 1/4" Domestic water and 1" Boiler connections. You might also want to check out Dunkirk Artesian and TFI-Everhot.