Why does the temperature chart show different levels of boiler demand?

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Why does the temperature chart show different levels of boiler demand? To my knowledge my boiler (Glow Worm Energy 25r) is either on or off.

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  • Vertigo
    Vertigo ✭✭✭
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    Id also like to see when its actually on or off. But I think tado uses some smarts taking in to account resident heat in the system. So when it needs eg "25%" power, it may open the valves but not trigger the boiler if the water in the system is still warm enough, but it would trigger at 25% if the water is deemed cold.

    This just me guessing based on watching the system work.