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24 

RV53i & RV53e Operation and Installation Manual 

  Venting 

•  This water heater is a direct vent water heater and 

therefore is certified and listed with the vent 
system.  You must use vent components that are 
certified and listed with the water heater model. 

•  Do not combine vent components from different 

manufacturers. 

•  The vent system must vent directly to the outside 

of the building and use outside air for combustion. 

•  Venting should be as direct as possible with a 

minimum number of pipe fittings. 

•  Avoid dips or sags in horizontal vent runs by 

installing supports per the vent manufacturer’s 
instructions. 

•  Support horizontal vent runs every four feet and all 

vertical vent runs every six feet or in accordance 
with local codes. 

•  Vent diameter must not be reduced. 
•  Do not connect the venting system with an existing 

vent or chimney. 

•  Do not common vent with the vent pipe of any 

other water heater or appliance. 

•  Vent connections must be firmly pressed together 

so that the gaskets form an air tight seal. 

•  The vent piece connected to the water heater must 

be secured with one self-tapping screw. 

•  Refer to the instructions of the vent system 

manufacturer for component assembly instructions. 

•  If the vent system is to be enclosed, it is suggested 

that the design of the enclosure shall permit 
inspection of the vent system.  The design of such 
enclosure shall be deemed acceptable by the 
installer or the local inspector. 

Condensate formation can occur in high efficiency 
direct vent appliances.  To prevent condensate 
damage follow these instructions. 

NOTICE 

Provisions must be made to prevent the condensate 
from entering the water heater.  Without proper 
drainage or disposal, condensate will damage the heat 
exchanger. 

     WARNING 

The condensate trap must be primed before operation 
to prevent exhaust gases from entering the building. 
 

NOTICE 

If it becomes necessary to access an enclosed vent 
system for service or repairs, Rinnai is not responsible 
for any costs or difficulties in accessing the vent 
system.  Warranty does not cover obtaining access to 
an enclosed vent system. 

•  Vertical terminations must incorporate a 

condensate drain and trap as close as possible to 
the appliance. 

•  The RV53i water heater has an integrated 

condensate collector. 

•  Rinnai offers a condensate trap.   
•  Regions of cold climate will create more 

condensate in the vent system.  The condensate 
collector should be used in cold climates. 

•  Use only vent that is approved and identified as 

acceptable for your particular model. 

•  Do not use PVC, CPVC, ABS or galvanized 

material to vent this appliance. 

•  Slope the venting toward the appliance according to 

the vent manufacturers installation instructions. 

•  All condensate must drain and be disposed of per 

local codes. 

•  Use only PVC or CPVC pipe for the condensate 

drain line.   

•  The condensate drain pipe should be as short as 

possible and have a downward pitch. 

•  Do not connect the condensate drain pipe directly 

to the rain sewer. 

•  The condensate drain pipe (along its entire length) 

must be at least the same diameter as the drain 
line. 

•  The end of the condensate drain pipe should be 

open to the atmosphere.  The end should not be 
under water or other substances. 

•  Do not connect the condensate drain line with an 

air conditioning evaporator coil drain. 

•  To minimize freezing of the condensate, run the 

condensate drain line through an interior wall or 
between insulation and an interior wall. 

•  The condensate collector should be used for all 

hydronic heating applications.