Overview Of Condensing Continuous Flow Gas Water Heater - Bosch BC3200RA Owner's Manual

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.
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.
8 8
Operating Instructions
Conventional
Exhaust
type
About 200°C
Combustion gas
About 200°C
First heat exchanger
Condensing
Continuous Flow
Exhaust
Gas Water Heater
About 50°C
Secondary heat exchanger
Combustion gas
About 200°C
First heat exchanger
Drain pipe
(Installation example)
Condensate
comes out
from here.
Water is heated
using the exhaust
gas which is about
200°C.
During combustion, white
steam may often be seen.
This is normal.