Product Features The ZL-2548 is a control group for use manifold in underfloor heating applications. The mixing valve on the ZL-2548 is adjustable between 20° - 65°C which complies with the requirement of BS 1264-4 2009 for initial warm up temperatures of between 20° - 25°C and a locking pin to set maximum blend temperature. The ZL-2548 has an additional probe pocket for an optional over temperature device to be installed. A throttle to increase the Kv of the mixing valve for larger systems. A built in non-return valve above the circulation pump to prevent back filling during the system fill and also reduces water loss if the circulation pump needs to be removed for maintenance. Features and Benefits £ Precision engineered materials and market leading high-efficiency pump technology provide long lasting and leading performance. Inclusive temperature control ensures that the water temperatures entering the floor do not exceed design temperatures. Built in thermostatic actuator with temperature range between 20°-65°C for system design across all floor constructions. Integrated flow rate control valve for increased regulation of the flow rate and temperature of the underfloor heating system. Standard 210mm manifold spacing and 1” BSP connections allows for use across wide range of manifold products.