The Walchem WMB81111-1NNNN controller is now obsolete and the replacement is the WBL900 controller. The new series has upgraded features; for reference, here is the description of the old model:
Multi I/O boiler controller, contacting electrode 1: 250 PSI, contacting electrode 2: 250 PSI, contacting electrode 3: 250 PSI, contacting electrode 4: 250 PSI, prewired w/ USA cords, 7 powered relays, 1 dry contact relay, no analog outputs, 6 digital inputs, USB & Ethernet comms software/hardware, no add'l comms hardware, no add'l comms software.
