Noritz NRC111DV - Overview of Condensing Tankless Gas Water Heater

8
Cold water Cold water Gas Gas Hot water Hot water
Condensate
Combustiongas
About
400˚F(200˚C)
Exhaust Exhaust
About
120˚F(49˚C)
Conventional
type
Condensing
TanklessGas
Water Heater
Water is heated
usingtheexhaust
gaswhichisabout
400˚F(200˚C)
.
Primary heat exchanger
Primary heat exchanger
Secondary heat exchanger
condensate trap
Combustiongas
About
400˚F(200˚C)
About
400˚F(200˚C)
Thecondensingtanklessgaswater
heaterdischargescondensate.
When heat from the exhaust gas is collected within
the secondary heat exchanger, condensation occurs
from moisture in the exhaust gas and the resulting
water is discharged from the drain pipe (approx.
2 gallons/hour (7.5 liters/hour) maximum). It is not a
water leak. Do not plug or block the drain line as it
must always be allowed to freely ow.
Note : The condensate discharged is acidic with a pH
level of approximately 2-3.
A condensate neutralizer may be required by
local code prior to disposal.
Drain pipe
(Installation example)
OverviewofCondensingTanklessGasWaterHeater
This water heater is a high efciency, fully condensing appliance. Unlike a traditional tankless water
heater, a condensing type captures heat from the exhaust gas and uses it to preheat the incoming
cold water as it passes through the secondary heat exchanger as illustrated below.
Thecondensingtanklessgas
water heater tends to show
whitesteam.
After the exhaust gas passes through the
secondary heat exchanger, it becomes low in
temperature and moisture rich which tends to
produce steam at the vent discharge terminal.
This is a normal occurrence.
Condensate
comes out from
here.
During combustion, white
steam may often be seen.
This is normal.