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Bosch 660 EF User Manual page 26

Indoor model/ natural gas/lp gas boilers
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Installation instructions
Comercial Use Treatment Guidelines
Type of
Hardness
Water
Level
Soft
0-1 gpg
(0-17 mg/L)
Slightly Hard
1-3 gpg
(17-51 mg/L)
Moderately
3-6 gpg
Hard
(51-100 mg/L)
Hard
6-10 gpg
(100-171 mg/L)
Very hard
10-14 gpg
(171-239 mg/L)
Extremely Hard
> 14 gpg
(> 239 mg/L)
Table 6
1)
Install Bosch Isolation Valves to allow for flushing.
2)
Flushing is required if a water softener is not installed.
3)
Flushing is required if a water softener is not installed.
26
Treatment
Flush
1)
Device
Frequency
None
None
None
None
2)
Water Softener
Once a Year
Suggested
Water Softener
Twice a
3)
Suggested
Year
Water Softener
Softener
Required
Water Softener
Softener
Required
6 720 644 063

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