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DHW Recirculation
DHW recirculation lines increase the level of
comfort and convenience of the domestic
hot water supply and reduce water
consumption.
These advantages directly derive from the
immediate availability of domestic hot water
at all draw points.
Poor insulation of the DHW recirculation
line, however, can result in considerable
heat loss.
DHW
RP
R
DCW
Vitocell-V stand-alone DHW storage tank
DHW Recirculation with Gas-Fired Combi Series
Due to the low water content of the plate
heat exchanger, it is not advisable to
connect a DHW recirculation line to the
Vitodens Combi boiler.
Viessmann therefore recommends that
effective insulation be provided and used for
DHW recirculation lines of 23 ft./7 m in
length or longer.
In addition to a recirculation pump and a
flow check valve, the DHW recirculation line
should incorporate a programmed timer to
switch off the recirculation pump overnight.
Legend
DCW Domestic Cold Water
DHW Domestic Hot Water
TPV Temperature and Pressure Relief
Valve
R
DHW Recirculation Line
DCW
RP
DHW Recirculation Pump
DHW Recirculation
13
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