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8.2 Water Treatment
If this Combi Boiler will be installed in a location where the hardness of the supply water is high, scale Build-up
may cause damage to the Plate Heat Exchanger.
Perform suggested treatment and maintenance measures to be taken based on the water hardness level
according to the below table.
Type of Water
Hardness Level Treatment Device*
Soft
Slightly Hard
Moderately Hard
(51-120 mg/L)
Hard
(120-171 mg/L)
Very Hard
(171-200 mg/L)
Extremely Hard
NOTE Damage to the Combi Boiler as a result of the items below is not covered by the Pavilion Limited
Warranty.
• Water in excess of 12 gpg (200 mg/L) of hardness
• Poor water quality (See the Water Quality List on page 14).
Water treatment device
• The water must be treated with either the a Scale Inhibitor* or a water softener.
* Scale Inhibitor: See the page 6 for more detail information.
• Water softeners may be regulated by the local water jurisdiction, consult with the manufacturer for code,
sizing, and installation guidelines.
The below diagram is for reference only. For more information about Scale Inhibitor, contact Pavilion
Customer Center at https://www.peerlessboilers.com/ or 1-855-443-8468.
Shutoff Valve
The illustration is an example. Check with the actual Combi Boiler about the position of piping, and form.
42
Connecting the DHW pipe
Treatment Guidelines
0-1 gpg
(0-17 mg/L)
None
1-3 gpg
(17-51 mg/L)
3-7 gpg
7-10 gpg
Scale Inhibitor*
Water Softener
10-12 gpg
> 12 gpg
(> 200 mg/L)
Cold supply to Combi Boiler
DHW Outlet
Cold Inlet
To DHW Cold
Water Supply
Shutoff Valve
Pressure Relief Valve
Hot Water to
Drain
Fixtures
To Auto Feeder
Backflow Preventer
Flush Frequency*
1
None
or
3
Once a Year*
Water Treatment System
Pressure Reducing Valve
*
When selecting a treatment device,
1
2
you must consult with the device's
spec sheet and installation manual for
guidelines and limitations.
Not all water supplies are compatible.
A water test may be required.
*
Install Service Valve Kit with Pressure
2
Relief Valve to allow for flushing.
*
See the page 6 for more detail
3
information about Scale Inhibitor.
4
*
Flushing is required if a water
4
treatment device is not installed.
Shutoff Valve
Sediment Filter
Water Treatment Device
City Water Supply
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