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Rinnai Tankless Water Heater Installation and Operation Manual 27
4.5.2 Venting Installation
Sequence
1. Install the water heater.
2. Determine the termination method—horizontal
or vertical, concentric, or twin pipes, etc.
3. Determine proper location for wall or roof
penetration for each termination.
4. Install termination assembly as described
in this manual or in the vent manufacturer’s
installation instructions.
5. Install air and vent piping from water heater to
termination.
6. Slope horizontal exhaust run towards the
water heater 1/4 in. per foot. DO NOT slope
combustion air pipe towards water heater.
7. Install vent supports and brackets allowing
for movement from expansion, or as per vent
manufacturer’s instructions or local code
requirements.
8. Install vent screen (supplied with water
heater) on PVC combustion air and exhaust
termination elbows as illustrated below.
• Press vent screen inside of termination
piece/elbow.
• Secure vent screen to the elbow with
screw provided.
4.5.3 Termination
Considerations
Check to determine whether local codes
supersede the following clearances:
• Avoid termination locations near a dryer
vent.
• Avoid termination locations near commer-
cial cooking exhaust.
• Avoid termination locations near any air
inlets.
• You must install a vent termination at least
12 in. above the ground or anticipated
snow level.
The vent for this appliance shall not terminate:
• Over public walkways.
• Near sot vents or crawl space vents or
other areas where condensate or vapor
could create a nuisance or hazard or
cause property damage.
• Where condensate or vapor could cause
damage or could be detrimental to the
operation of regulators, pressure relief
valves, or other equipment.
Listed below are important considerations for
locating vent termination under a sot (ventilated
or unventilated or eave vent; or to a deck or
porch):
• Do not install vent termination under a
sot vent such that exhaust can enter the
sot vent.
• Install vent termination such that exhaust
and rising moisture will not collect under
eaves. Discoloration to the exterior of the
building could occur if installed too close.
• Do not install the vent termination too
close under the sot where it could pres-
ent recirculation of exhaust gases back
into the combustion air part of the termina-
tion.
Figure 14: Vent screen
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