I have a two-vessel system with a single pump, recirculating mash but have no way to maintain temperature thus far. I was thinking of punching a hole in my 10-gallon cooler lid and running a bulkhead through to allow a camlock connection to my hoses. Then it occured to be to add a simple 120V RIMS tube line so I could add a little bit of heat before returning through the lid bulkhead.
Surely someone else had done something similar before. Are there any design threads on HBT I can read through?