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Can any 1 pls advice me how to adjust the Central Heating Manual Thermostat. I understand there is the adjustment on the mercury thermostat. Its currently 0.2, what does this signify? Also there need to be adjustment on the gas valve for it to work properly with this Manual Thermostat. How do...

Hi, Can any 1 pls advice me if I am able to upgrade my current central heater to include an automatic reignition of the pilot light. I notice my friend's new heater have this function. Its just a press of the button, can reignite the extinguished pilot light. If I have this function it saves...