Just wondering how this weird "coolant pipe" running across the top of my EKO 40 could be used to its maximum benefit? Could it be used as a preheater HX for my DHW, I suppose it would also cool the boiler in an emergency if I had a circulation pump rigged to run in an outage (probably its purpose)? I have no idea how it is coupled with the boiler internals and the manual says to just leave it alone and cap it off so it can still vent. Has anyone here used it for something? Thanks to everyone on this board, for making it what it is!