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Just had a new Viessmann Vitoden 100w heat only boiler installed, I have to turn the dial all the way to max just to get some decent heat, if I turn it all the way (so it's pointing at reset) it'll settle at around 76 degrees. Is this normal? It's modulating fine, I was maybe expecting to set the dial at the dot at 4, but that's not hot enough to heat the hot water cylinder. Pump is on medium speed setting, any slower and some of the rads don't heat up.