At Home with Water, a study conducted by the Energy Saving Trust, analysed real-life water use in homes, and developed consumer-led water efficiency solutions. As part of its first phase, this report provides an analysis of self-reported water use information generated online through the Energy Calculator by more than British 86,000 households. The study revealed, among others, that individuals use 142 and households 349 litres of water per day. The average annual metered water bill amounted to £427. Hot water use contributes £228 to the average annual combined energy bill and produces 875 kg of CO2 per household per year.