In-line water heaters are
used in applications where the location for which there is a need to heat water
is distant from the main water heater. The units are used in applications such
as jetted tubs and spas to add heat to the water as a means of counteracting
the cooling effect from pressurized water mixing with air as it is being
circulated through the jets. Some uses of the term in-line water heater also
refer to what was described earlier as tankless or on demand water heaters.
