Rinnai Common Venting Selection Guide Miscellaneous Information

Rinnai Water Heater Miscellaneous Information - Common Venting Selection Guide.
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CVENT ACCESSORIES

Tankless Rack System

Configuraton

Kits Required for up to 100 ft Equivalent

Cvent Header Kit

PVC 

Adaptor

CVent Termination CVent Roof Flashing

Wall

Roof

Flat

Pitched

Type

WH Qty.

Rack Config.

CV8IL3

CV8IL4

CV8IL5

CV8IL6

CV8IL7

CV8IL8

780037

790004

790001

790002

790003

Wall Mount

(TRW)

3

03

1

1

2

1

1

1

4

02 + 02

1

1

2

1

1

1

5

02 + 03

1

1

2

1

1

1

6

03 + 03

1

1

2

1

1

1

7

03 + 02 + 02

1

1

2

1

1

1

8

02 + 02 + 02 + 02

2

2

4

2

2

2

1*

1

2

1

1

1

Type

WH Qty.

Rack Config.

CV8IL3

CV8IL4

CV8IL5

CV8IL6

CV8IL7

CV8IL8

780037

790004

790001

Tankless 

Rack System 

Inline

(Freestanding)

TRS-IL

3

03

1

1

2

1

1

1

4

02 + 02

1

1

2

1

1

1

5

02 + 03

1

1

2

1

1

1

6

03 + 03

1

1

2

1

1

1

7

02 + 02 + 03

1

1

2

1

1

1

8

02 + 03 + 03

1

1

2

4

2

2

2

1*

1

2

1

1

1

Type

WH Qty.

Rack Config.

CV8BB3 CV8BB4 CV8BB5 CV8BB6 CV8BB7 CV8BB8

780037

790004

790001

Tankless Rack 

System

Back to Back

3

03

1

1

2

1

1

1

4

04

1

1

2

1

1

1

5

05

1

1

2

1

1

1

6

06

1

1

2

1

1

1

7

03 + 04

1

1

2

1

1

1

8

04 + 04

2

2

4

2

2

2

1*

1

2

1

1

1

* Option restricted to 41 ft. equivalent.
NOTE: All intake parts except the intake termination and PVC adapter are to be field supplied and are not 

provided by Rinnai. Order extensions and elbows as needed.  
If spacing between water heaters is GREATER than 20.5” (center line to center line), the installer must 

purchase a vent extension and cut to the appropriate length.  Refer to the manual for further instructions. 
The length of each additional vent extension must be considered in the maximum allowable vent length.

Selection Guide

COMMON VENTING

IL = inline

B to B = back to back

CVent Elbows  

Equivalent Lengths

45° = 3ft

90° = 6ft

VENTING OPTIONS FOR THE TANKLESS RACK SYSTEM

Venting Options

Exhaust Vent Material

Intake Vent Material

Diameter 

(in)

Max 

Units

Max Equivalent  

Vent Length (ft)

Common Venting System

PPtl (CVent)

PPtl or PVC (field-supplied)

8

8

100 (with 7 TWH units or less) 

41 (with 8 TWH units)

Concentric

PPs

PVC

5

1

65 (NG) / 41 (LP)

Dual Pipe* (Centrotherm)

PPs*

PPs* or PVC

3

1

41

3 “ PVC / CPVC

PVC or CPVC

PVC or CPVC

3

1

65 (NG) / 41 (LP)

4 “ PVC / CPVC

PVC or CPVC

PVC or CPVC

4

1

100 (NG) / 65 (LP)

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