A point-of-use water heater is a very small water heater, either a
mini-storage tank or a small tankless model, that is designed to be
installed at the point of use, thereby eliminating a long pipe run.
They are mostly sized to supply hot water to one specific application,
usually a sink. A common application is a remote sink, such as a
bathroom in an office building or a service station. Another common
application is for distant sinks in the home that typically take too
long to receive hot water.
Point-of-use
water heaters are usually used for one of two reasons. One is to supply
hot water to a remote location that is not served by a larger water
heater. The other is to eliminate the wait time for hot water you may
have at a particular faucet. Both offer the advantage of not having to
wait for hot water. You can install a point-of-use water heater right
at the source, e.g., under a sink. Therefore, when you turn on the
faucet you have hot water instantly available to you. This both
eliminates your wait for the hot water and saves water, our most
valuable resource, from being wasted down the drain as you wait for hot
water to arrive.