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The 2 Channel Programmer THR860 provides accurate time control for central heating systems and other applications. Programmers allow you to set ‘On’ and ‘Off’ time periods. 2 channel programmers switch central heating and stored domestic hot water, and allow both to come on and go off independently of
each other.
THR860 is suitable for replacing a wide range of timers on the market, and is a direct replacement for Honeywell ST6400 programmers without the need for re-wiring.