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Hi, Correct - the Heatslave has a heatbank, the heating of which needs to be controlled for hot water. Thanks for the info on where to connect the CM927. Can you confirm that that I wire the Relay box as shown in diagram 4a of the installation manual (Burner (direct control))? Thanks

Hi, I currently have a Worcester Oil Heatslave 15/19 with the fascia mounted Worcester programmer. I would like to connect a Honeywell CM927 programmable thermostat but since it only controls CH I need to continue to use the fascia mounted controller for HW. Is there a simple way to do this...