Recirculating the Mash tun and bringing it up to the right temperature for appropriate starch conversion. This is a Dark Mexican Lager and I set the RIMS system to mash the grains at 152 F. This is a 5 gallon batch.  The sweet wort is drained from the bottom of the mash tun as it passes through a stainless steel false bottom.  The wort is then pumped into an electric stainless steel heating tube with a sight glass.  At the end of the heating tube I have a thermowell and a probe that leads back to a Ranco digital temperature controller.  The temperature controller reads the passing worts temperature and activates the stainless steel heating bar inside the heating tube when the wort falls below the desired mash temperature. After the wort passes the thermowell it is pumped back into the kettle via a stainless steel sparge arm.

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