Yes, it turns the gas burner to the mash tun on and off based on mash temperature and also controls a pump to recirculate the mash (purely to prevent scorching and filter through the grainbed, since the pump is not pumping through a RIMS tube or HERMS coil).
I'm still stumped on why they have a separate controller for the HLT though, unless someone wants to do an automated fly sparge, but that would be more trouble than it's worth IMO.
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