Three trials deal with the comparison of consumption of hot water (about 30°C) and control water (about 20°C). In each trial 36 rabbits are used to compare the consumption of feed and water of 6 cages. In two trials, the air temperature is about 23°C and in one trial, it is about 29°C. The hot water seems to be wasted whatever the air temperature. In fact, the feed/water ratio is higher than 3 against 2 usually. In case of high air temperature, the feed consumption is reduced of 50 per cent whatever the water temperature. Rabbits don't appreciate hot water but the main factor which explain the reduction of the feed consumption in summer is the air temperature and not the water temperature.