Hot Water (DHW) is water for human consumption (drinking) that has been heated. Used to human health uses (toilets, showers, etc..) And other uses cleaning (scrubbing dishes, washing machine, dishwasher, scrubbing floors).
The hot water can be prepared in essentially two ways:
In a water tank heated by a boiler outside to have, at any time, enough for the intended use at the facility. This system, called centralized water can also prepare for a single user (single house or premises) or for many users (collective system). If the storage tank and pipes are large enough, they can use the many points at once. From the energy point of view, it is much more efficient than the next.
By warming “instant”
The water circulates through a coil heated directly by the flame or through heated water heater (generally used for the heater). Given the power required in boiler, this system can only feed a consumer point, or tap. The energy efficiency of this system is much less than before.
ACS preparation requires considerable amount of energy and is a greater consumption of the residential building, assuming amounts between 20% and 40% of total consumption.