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My case is little complex. I have a solar panel hot water system which has electical back up. that hot water tank needs to be replaced now. we are thinking buy a storage tank only for the solar panel system and use the tankless as the backup. we can do manual switch. most of time we are going to use solar energy and also we don't want to heat entire tank each time because we may only a little and next is good sunshine.
Im pretty sure buderus offers a storage tank that has 2 coils through it. coil 1 would be your solar wich would be your primary. and then the 2nd coil would be from your boiler. this would only run when your solar was not mantainging the sufficient temperature. Im almost positive its buderus though. Ill get the flyer i looked at from the supply house tomorow and post the info on it. NM found the web page. Here you go. I personally would use this so you only need to have 1 tank. http://www.buderussolar.com/Products...3/Default.aspx