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Outdoor Boiler w/ Condensing Backup - Piping Arrangement
Hello, long time viewer, first time poster...I'm in the process of re-designing my piping system for a outdoor wood boiler. I purchased a condensing backup boiler and would like the house side to be pressurized. I have found an article w/ schematic that accomplishes just that but had some questions.
Photo 1, shows a pressurized system coupled to the unpressurized boiler. I plan on using the main circ (to the right of the plate heat exchanger) as my boiler protection, where it will turn off when temperature drops below 140F and the condensing boiler will pick up. My question arises when I look at photo 2, providing freeze protection w/ a small circulator. To the right where it says "To the heating system" it shows another circulator. Why is there a circulator in photo 2 but not photo 1? Will I need that second circulator?
thanks - Matt