NSMaple1
Addicted to ArboristSite
I had a circulator stick once after sitting all summer. Would be odd to have two stick at the same time - but you never know I guess. It's also a good idea to have a spare on hand in case one konks out in the middle of a cold snap - swapping in a known good one would rule a circulator problem out. Also another reason to have lots of iso valves - easy swapping. Good luck anyway.