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Installation instructions
3.7
Insulation blanket
If an insulation blanket is installed, the manufacturer's
instructions included with the kit must be carefully fol-
lowed.
Application of any external insulation, blankets or water
pipe insulation to this water heater will require careful
attention to the following:
• Do not cover the temperature and pressure-relief
valve.
• Do not cover access panels to the heating elements.
• Do not cover the electrical junction box of the water
heater.
• Do not cover the operating or warning labels
attached to the water heater or attempt to relocate
them on the exterior of the insulation blanket.
• Do not block the air inlet grill or the exhaust vent
opening.
3.8
Filling the water heater
Warning: The tank must be full of
water before heater is turned on. The
water heater warranty does not cover
damage or failure resulting from
operation with an empty or partially
empty tank.
B Turn off power supply.
B Make certain the drain valve is completely closed.
B Open the shut-off valve in the cold water supply line.
B Open a hot water faucet to purge air from the water
heater and piping.
B A steady flow of water from the hot water faucet(s)
indicates a full water heater.
B Turn on power supply.
3.8.1
Water quality
If your water quality exceeds the levels in the table
below, you should consider treating or conditioning the
water entering the water heater. Bosch's warranty does
not cover product failures resulting from water quality
related issues.
Contaminant
1)
Total Hardness
Aluminum
Chlorides
Copper
Fluoride
Table 2 Source: Part 143 National Secondary Drink-
ing Water Regulations
16
Recommended Level
More than 2 gpg
Up to 0.2 mg/L
Up to 250 mg/L
Up to 1.0 mg/L
Up to 2.0 mg/L
Contaminant
Iron
Manganese
pH
Silver
Sulfate
TDS (Total Dissolved Solids)
Zinc
Table 2 Source: Part 143 National Secondary Drink-
ing Water Regulations
1)
Hardness is not regulated by the National Secondary
Drinking Water Regulations
3.9
Installation checklist
1. Tank location
• Is room size less than 10' x 10' x 7' (700 cu. ft.)? If
yes, louvered door or similar ventilation is needed.
• Is there 5-½" of clearance (air space) between any
object and the front and rear shrouds?
• Is front of unit free and clear?
• Use level to confirm water heater is exactly vertical. If
not condensate will not drain properly. Add shims as
needed under the base of the unit.
• Are bracing straps (if required) in place?.
2. Plumbing connections
• Plumbing line must not block air filter removal on top
of the unit.
• Check for leaks on plumbing lines and water heater
connections.
3. Condensate lines are in place
• Connect both drain lines. Connect longer conden-
sate tube to lower drain and run to an appropriate
drain or condensate pump.
4. Ensure that the Temperature and Pressure-
Relief Valve is operational and the drain line is
installed per local code.
5. Electrical connections
• Electrical connections do not prevent air filter
removal.
• Confirm that water heater electrical circuit is properly
isolated.
6. Verify control panel displays 120°F Auto mode.
7. Front cover is in place.
Recommended Level
Up to 0.3 mg/L
Up to 0..05 mg/L
6.5 to 8.5
Up to 0.10 mg/L
Up to 250 mg/L
Up to 250 mg/L
Up to 250 mg/L
6 720 646 804
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