Rinnai RU98i - Water Heater Spacing

Rinnai CVent 30
Installaon Instrucons
Recommended Spacing of Water Heaters
Spacing of the water heaters is crical for the common vent
system to mounng easily and securely. The collectors are
made for 20.5” spacing (center line to center line) between
water heaters. If a dierent spacing is needed, please
contact Rinnai concerning your applicaon. Rinnai
recommends using our Tankless Rack System (TRS) which is
designed for 20.5” spacing. Our engineered system is
designed to make installaon simple which greatly reduces
labor me and the chance of miscalculaons.
Custom Water Heater Spacing
If common venng with LESS than 20.5” between water heaters:
• The installer assumes all responsibility of following local codes. Inspectors can reject the installaon if the
rang plate cannot be seen for all water heaters.
• D4 Extension Pieces must be cut appropriately to maintain the required 3° slope.
If common venng with GREATER than 20.5” between water heaters:
• The installer must purchase a vent extension cut to the appropriate length between the collectors.
• The length of each addional vent extension must be considered in the maximum allowable vent length.
• D4 Extension Pieces must be cut appropriately to maintain the required 3° slope.
NOTE: Never attempt to cut or modify the
collectors.
To maintain a 3° slope, use the following
formula to calculate D4 Extension Piece
length (L):
(L) = (water heater spacing) X 0.05
Example: if the adjacent water heater is
20.5” away
Length (L) = 20.5” x 0.05 = 1.02”
Example: if the adjacent water heater is
26” away
Length (L) = 26.0” x 0.05 = 1.30”
20.5”
Vent extension -
cut to size
Air Intake -
extension
D4 Extension
Piece