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    Nest 3rd Gen to replace Potterton EP2002-Installation Advice

    Dear Friends, At this moment I have: Ideal W Gas boiler Cold water tank in attic Potterton EP2002 Programmer (can currently control CH & HW independently) Pic 1 Potterton EP2002 Programmer (Wirings) Pic 2 PRT100 Thermostat Pic 3 PRT100 Thermostat (Wiring) Pic 3. My questions are, 1. I did...
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