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hertboilers, thanks for the diagram that explains what I need to do nicely.

Hi SavageW, thank you for taking the time to reply. My current system setup has the one programmer only, which controls both the heating and hot water, the wiring for the Hortsmann H27XL programmer is shown in picture 1. I've attached the wiring diagram for the programmer also. The second...

Hello. I've purchased a Hive 2 heating and hot water system (self install) to replace my Hortsmann H27XL and Hortsmann HRT4-B thermostat. I live in a new house with two zones for controlling upstairs and downstairs heating, with separate hot water control via three separate motorized valves. The...