Grundfos 3/4" Clip-on Aquastat Kit (sku# 595657) can be used with Grundfos UP series, single speed circulators. The control will turn the circulator on at 105F and will turn it off at 115F.
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Great for recirculating your hot water to maintain warm/hot water at the faucet. No more cold water when you turn on the hot water.