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If JackRafter is useing only one "Automatic fast fill", pre-set for say, 19 psi, shouldn't both boilers, when cold just reach this point and stop?
and then as you say LP, when one or the other heats, should they not increase at the same rate it all being a closed loop with just 2 boilers in the system???
Gerry
PS...Maybe a bad guage on one or the other boiler??????
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