8
8
Operating Instructions
Cold w
ater
Cold w
ater
Gas
Gas
Hot w
ater
Hot w
ater
Condensate
Combustion gas
About 200
°
C
About 200
°
C
Exhaust
Exhaust
About 50
°
C
Conventional
type
Condensing
Continuous Flow
Gas Water Heater
Water is heated
using the exhaust
gas which is about
200
°
C.
First heat exchanger
First heat exchanger
Secondary heat exchanger
Neutr
aliz
er
Combustion gas
About 200
°
C
Overview of Condensing Continuous Flow Gas Water Heater
This water heater is a high efficiency, fully condensing appliance. Unlike a traditional continuous flow
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 continuous
flow 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.
100cc/min maximum). It is not a water leak.
Do not plug or block the drain line as it must
always be allowed to freely flow.
Drain pipe
(Installation example)
Condensate
comes out
from here.
The condensing continuous flow 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.
During combustion, white
steam may often be seen.
This is normal.
