4
Rinnai CVent
Water Heater Installation
For information regarding the installation of the RU98i (REU-KB3237FFUD-US), RUC98i (REU-KBD3237FFUD-US), and
C199i (REU-KBD3237FFUDC-US) tankless water heaters, please reference the Installation and Operation Manual
included with the respective tankless water heater.
Set the water heater for “Long Vent” by adjusting the SW1 in DIPSW1 to the OFF Position. (Must be done on all tankless
water heaters when using CVent System)
High Altitude Installations
The Rinnai RU98i (REU-KB3237FFUD-US), RUC98i (REU-KBD3237FFUD-US), and C199i (REU-KBD3237FFUDC-US) tank-
less water heaters have been certified for use with the Common Vent System (CVent) at installations from
0 - 10,200 feet. (0 - 3,109 m). The Common Vent System is ANSI Z21.10.3 certified; exhaust components to be
propylene (PP/PPTL) for U.S. installations and PPS for Canadian installations (all venting components used in Canada
must be ULC-S636 certified). Intake components to be in accordance with national and/or local codes having
jurisdiction.
For CVent installations at high altitude you must ensure that the water heaters are properly installed and setup for the
altitude that they will be operating at.
For information on how to adjust altitude settings reference the respective In-
stallation and Operation Manual for the RU98i (REU-KB3237FFUD-US), RUC98i (REU-KBD3237FFUD-US), and
C199i (REU-KBD3237FFUDC-US) tankless water heaters.
Water heaters using CVent at altitudes over 2,000ft will automatically de-rate according to the table below. Use the
tables below for calculating your total Btu for multiple water heaters using CVent at elevation:
* RU98i (REU-KB3237FFUD-US), RUC98i (REU-KBD3237FFUD-US), and C199i (REU-KBD3237FFUDC-US)
Altitude: 2,001-10,200 feet
Natural and propane gas
High Altitude De-Rate plus Cvent De-Rate - LP Gas
Number
of Water
Heaters 2001-5200 Ft 5201 - 7700 Ft 7701 - 10200 Ft
1
168,000
151,000
120,000
2
332,640
298,980
237,600
3
493,920
443,940
352,800
4
651,840
585,880
465,600
5
806,400
724,800
576,000
6
957,600
860,700
684,000
7
1,105,440
993,580
789,600
8
1,249,920
1,123,440
892,800
High Altitude De-Rate plus Cvent De-Rate - Natural Gas
Number
of Water
Heaters
2001-5200 Ft 5201 - 7700 Ft 7701 - 10200 Ft
1
170,000
153,000
139,000
2
336,600
302,940
275,220
3
499,800
449,820
408,660
4
659,600
593,640
539,320
5
816,000
734,400
667,200
6
969,000
872,100
792,300
7
1,118,600
1,006,740
914,620
8
1,264,800
1,138,320
1,034,160
Summary of Contents for c199i
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