CWH companion water heater — Product Manual
Pre-installation
The 18-inch mixing valve side clearance
below is MANDATORY
. The 1½” clearance
on the opposite side is strongly recommended
(a smaller clearance will make servicing more
difficult). ADDITIONAL clearance may be
needed if piping is routed on both sides of
the boiler/water heater.
Figure 1
Clearance required (in addition to
clearances specified in the WM97+
manual) — right-mounted mixing valve
1½” min this side 18” min this side
Figure 2 Clearance required (in addition to
clearances specified in the WM97+
manual) — left-mounted mixing valve
1½” min this side18” min this side
Figure 3 Align water heater under boiler as needed
for the piping access panel to fit in place
Piping
access
panel
Codes
1. Installation must conform with instructions in this manual and,
where applicable:
• local, state, provincial, and national codes, laws, regulations
and ordinances.
• in Canada — B149.1 or B149.2 Installation Code.
2. CWH water heaters are exempt from ASME Section VIII, Division
1 Code construction per Interpretation VIII-1-86-136. Check with
local codes for applicability.
3. Where recommendations in this manual differ from local or na-
tional codes, local or national codes take precedence.
CSA Low Lead Content Only certification
1. This product has been certified by CSA to Class 6853 01 — Low
Lead Content Certification Program — Plumbing Products.
2. Applicable requirements:
a. NSF/ANSI 372-2010 Drinking water system components –
Lead Content.
b. California Health and Safety Code 116875 (known as AB-
1953-2006).
c. Louisiana House Bill HB.471, Louisiana’s Lead reduction Law.
d. Vermont Act No. 193 - 2008 Consumer Products Prohibition
against Lead.
e. Maryland House Bill 372 [Statute 12- 605], Business Occupa-
tions and Professionals – Plumbers – Lead Free Materials.
Code restrictions
National Standard Plumbing Code
1. Single-wall heat exchanger in water heater complies with National
Standard Plumbing Code, provided that:
a. Boiler water (including additives) is practically non-toxic, hav-
ing toxicity rating or class of 1, as listed in Clinical Toxicology
of Commercial Products, and
b. Boiler water pressure is limited to maximum 30 PSIG by ap-
proved relief valve.
Uniform Plumbing Code
1. Single-wall heat exchangers are permitted if they satisfy all of the
following requirements —
a. The heat transfer medium is potable water or contains only
substances which are recognized as safe by the U. S. Food and
Drug Administration.
b. The pressure of the heat transfer medium is maintained less
than the normal minimum operating pressure of the potable
water system.
c. The equipment is permanently labeled to indicate that only
additives recognized as safe by the FDA shall be used in the
heat transfer medium.
2. Other heat exchanger designs may be permitted where approved
by the Administrative Authority.
Clearances and placement
1. The CWH must be mounted under the WM97+ boiler, with the
boiler installed to meet all required clearances in the boiler manual.
2. IN ADDITION
,
provide 18 inches clearance minimum
on the
mixing valve side.
3. Read and comply with “Location,” page 4 of this manual.
Part number 635-500-156/0113
5
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