As it happens, mister, our Ideal Isar boiler's thermostat makes the boiler heat up faster if the water temperature is lower.
So if you turn up the thermostat well beyond the temperature you want then the water to the radiators heats up much faster.
Some men may not understand this sophistication but most women will get it straight away. :-)
Having said that, sometimes the boiler seems to have a mind of it's own and needs switching off completely to reset something. I'm told it's not the world's greatest boiler.