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Well just in case anyone else ends up needing to replace a Switchmaster 600 I can confirm that the RWB29 works just fine as a replacement (this was in a gravity hot water, pumped central heating system). It even comes with a helpful wiring interchange guide to show how to wire up the backplate...

Well the timing dial on my Switchmaster 600 has finally given up so I am looking to replace the unit. I would prefer a digital display but I am unsure as to what might be suitable as a direct replacement? I had been looking at the Siemens RWB29 but would that be appropriate? The Switchmaster...