Grant low temperature circulators can be used in both open and closed loop circulation systems and, when combined with the T and TX Optima thermostats, provide upto 18 different combinations covering basic through to sophisticated applications. Also available are two ready assembled low temperature refrigeration kits which include Optima thermostat mounted on the refrigeration unit and all the insulated tubing and clips needed. The table below details a selection of refrigeration units available, please contact SLS for a more comprehensive listing.