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Standards Compliance
Water heaters and common vent system must be
installed in accordance with these instructions, local
codes, and utility company requirements.
In the United States where local codes are not
available, use the latest edition of the American
National Standard/National Fuel Gas Code. A copy of
the Fuel Gas Code can be purchased from either the
American Gas Association, 400 North Capitol Street
Northwest, Washington, DC 20001, as ANSI standard
Z223.1, or National Fire Protection Association, 1
Sizing
The Rheem common vent system can only be used with following Rheem tankless water heaters:
RTGH-C95DVLN and RTGH-CM95DVLN
RTGH-CM95DVLN has a pre-installed manifold control. RTGH-C95DVLN is not shipped with manifold control. This is
the only difference between these two models. Both these models can be mixed to use with the Rheem common vent
system.
Number of
water heaters
2
3
4
5
6
7
8
Total input rate will drop naturally as longer vent length is added. Expect 6 to 10% input rate drop with maximum vent length.
Cold water, hot water and natural gas sizes are recommended sizes. The size requirements may change based on water
pressure, gas pressure, pressure drop, and other factors at installation site. Adjust accordingly these sizes for each installation.
Cold Water -
Total Input Rate
Recommended Manifold
(Btu/h)
Header Size (Inches)
399800
599700
799600
999500
1199400
1399300
1599200
INSTALLATION INSTRUCTIONS
Batterymarch Park, MA 02269 as NFPA 54.
In Canada, use the latest edition of the CAN/CSA
B149.1 Natural Gas and Propane Installation Code and
the Canadian Electrical Code, CAN/CSA C22.1, Part 1.
A copy can be purchased from; Canadian Standards
Association, 5060 Spectrum Way, Mississauga, ON
L4W 5N6
Hot Water - Recommended
Manifold Header Size
(Inches)
1
1
1
1
1 1/4
1 1/4
1 1/2
1 1/2
1 1/2
1 1/2
2
2
2
2
Natural Gas -
Recommended Manifold
Header Size (Inches)
1
1 1/4
1 1/4
1 1/4
1 1/2
1 1/2
2
9
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