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I would definitely use a staging control. You can have first boiler secondary circ run as stage one to extract any heat prior to firing, stage two as the on/off boiler, then stage 3 the second boiler circulator and then stages 4 & 5 on the staged boiler. Peak performance and efficiency. Use a good controller like a Tekmar or equal to do the work. Wirig will be fun but can be done.