8
Cold water
Cold water
Gas
Gas
Hot water
Hot water
Condensate
Combustion gas
About 400°F
About 400°F
Exhaust Exhaust
About 120°F
Conventional
type
Condensing
Tankless Gas
Water Heater
Water is heated
using the exhaust
gas which is about
400°F
.
Primary heat exchanger
Primary heat exchanger
Secondary heat exchanger
Neutralizer
Combustion gas
About 400°F
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 (GPH) 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)
Overview of Condensing Tankless Gas Water Heater
This water heater is a high efficiency, 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.
To Next Page
Loading...
Need help?
General
