The Walchem WBL600PSSNN-AA controller is now obsolete and is replaced by the Intuition-6 series of controllers. The new series is enhanced, but has similar specs. For reference, here are the specifications of the old model:
Series: WBL600
Relays/Wiring: 100-240 VAC, 6 Powered Relays, Prewired with USA Power Cord and Pigtails
Input Cards: Two Sensor Input Cards
Analog Outputs: No Analog Outputs
Ethernet: No Ethernet Card
Sensors: Two Boiler Sensors with ATC, 1.0 Cell Constant, 250 PSI, 20' Cables