[itsnotanova]

Originally Posted by stephen wilson

How about an electric water pump with a stand-alone controller that varies pump speed in response to cooling needs ?
https://daviescraig.com/?gclid=EAIaIQobChMIu4SqyMGe4wIVCLbICh0toQcpEAAYASA AEgJk0fD_BwE

That's pretty much what I was thinking but on a cheaper scale. I like DC water pumps, but I was thinking of using a generic rotary switch. I would control the flow myself by keeping an eye on the temp gauge.