Important Safety Information
Danger: [660 EF] - do not install
Do not use the water heater if the ex-
haust pipe is displaced, has holes, is
clogged or is corroded.
Danger: [660 EFO] - do not install
This will cause carbon monoxide poi-
soning and a potential fire hazard.
Danger: Do not allow anyone to
change the water temperature while hot
water is being used!
To prevent scalding, do not change the
water temperature to a higher setting.
Warning: If the information in this
manual is not followed exactly, a fire or
explosion may result causing property
damage, personal injury or death.
Warning: This water heater does not
have a pilot. It is equipped with an igni-
tion device that automatically lights the
burner. Do not try to light the burner by
Warning: BEFORE OPERATING
smell all around the water heater area
for evidence of leaking gas. Be sure to
smell next to the floor because some
gas is heavier than air and will settle on
WHAT TO DO IF YOU SMELL GAS:
- Do not try to light any appliance.
- Do not touch any electrical switch; do
not use any phone inyour building.
- Immediately call your gas supplier from
a neighbor's phone. Follow the gas sup-
- If you cannot reach your gas supplier,
call the fire department.
Use only your hand to turn the gas valve
knob. Never use tools. If the knob will
not turn by hand, don't try to repair it.
Call a qualified service technician.
Force or attempted repair may result in
a fire or explosion.
Do not use this water heater if any part
has been under water. lmmediately call
a qualified service technician to inspect
the water heater and to replace an dam-
When a gas leak is noticed:
1. Stop use immediately
2. Close the gas valve
3. [When installing indoors] Open win-
dows and doors.
If you detect abnormal combustion or
abnormal odors, or during an earth-
quake, tornado or fire:
1. Turn off the hot water supply
2. Turn off the power to the water heat-
3. Turn off gas and water supply valve.
4. Call the nearest Bosch agent.
6 720 644 063