#EnergyEfficiency advice (UK context but should be applicable everywhere):

In this video, we help you understand what heating temperature your combi boiler should be set at, if you have the right type of boiler and show you how to do it simply and safely yourself. If you have a Worcester, Ideal or Vaillant combi boiler you can also turn off the hot water ‘preheat’ to save another 5-10% on your gas bills. We give a couple of common examples in the video. For more model-specific guidance go to our website: www.theheatinghub.co.uk/mission