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old cast iron mixed with new munchkin
apt blg scenario. owner wants hi eff.concerned about going
straight munchkin. would like to split btu.leave say half of existing cast iron capacity and front load with munchkin.
a. how to control (don,t want mixing or injection reset.just want plain non 140 degree limited reset based on condensing boiler)
would i have to be concerned about corroding the cast iron
how would you set up
john sawyer of htp say there was an article about this in pm