Hot water just like cold water provides your body with the necessary hydration it needs to replenish fluids. Hot water can help in improving your digestion, reducing stress, reducing joint pains and relieving nasal congestion, among many other things. Warm water that between the temperature of 120°F and 140°F helps improve one's health in different ways as it serves different purposes to the body.
The hot water however should not be too hot that it causes burns and it is advisable to add a small slice of lemon to help in vitamin c boost.