NANO-X HLT's, HERMS & RIMS
Heat Exchange Recirculating Mash System (HERMS) is a really effective and safe way to reheat wort that has been removed from your Mash Tun and put back into the top of your Mash Tun when recirculating. A HERMS is basically a tubed coil fitted to the inside of a vessel and then the vessel is filled with water and heated using a heat sauce. The water in the vessel is enough to fully immerse the coil and as wort passes through, internally within the coil, heat from the water will transfer to the wort thus heating the wort to the temperature of the water within the vessel. To make this type of system work the coil length needs to be long enough or internally wide enough to ensure the wort spends enough time in the coil to heat to the desired temperature. Recirculating through a heat sauce like a HERMS ensures the temperature of your Mash/Mash Tun is maintained or raised through recirculating.
Recirculating Infusion Mash System (RIMS) basically works by using direct heat on a tube or within a tube or vessel to heat the wort as it is recirculated through the tube or over the heat source within a vessel. The heat source can be an electric element or gas, but the wort is heated as it passes through a tube or over an element within a tube or vessel as it is pumped during re-circulation. The pump keeps the wort moving at a steady rate to avoid scorching it. The pump must run continuously during the mash when heating, though the heater itself is often cycled on and off to control temperature. A risk with the RIMS system is scorching if they are not set up correctly but in CPB's opinion they are the better system and feel free to ask us why.