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The bathroom is on the same floor, a few metres from the boiler. It takes at least a minute for the water to start getting warm

First of all, I should say that I don't have any knowledge about plumbing or boilers. I tried to turn on the preheat by holding the Eco button and selecting "On" on the display. As you can see in the screenshot, PreHeat appears to be on, yet the water still takes a long time to heat up at the...