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EK DHW indirect vs. storage tank with flat plate heat exchanger
I am getting close to pulling the trigger on an EK Resolute. I currently have an oversized 33 year old Weil-McLain with 3 hot water baseboard zones and a 40 gallon Mega-Stor indirect on priority.
Installer wants to use my existing indirect, but I have read that there are disadvantages compared to EK's solution. In another thread, it was suggested that the existing indirect can be used as a storage tank with the internal coil disconnected, which seems to have all the advantages of the EK system without needing to buy the new tank (although I don't really understand what the advantages are). However, Roger Marran himself seemed to recommend against this, although I don't really follow the reasoning.
It would help if someone could help me understand exactly how the EK system works. It sounds kind of like an aqua booster, where a circulator moves DHW through the boiler's tankless coil and back into the storage tank. My guess is that, instead of a tankless coil there is ANOTHER circulator running boiler water through the flat plate heat exchanger. Am I on the right track?
Can someone help elaborate the pros and cons?
On a totally separate topic, my installer says my system is simple enough that I don't need primary/secondary piping. Does that make sense?