Installation Sheet

18 Rinnai Tankless Water Heater Installaon and Operaon Manual
1. Install the water heater.
2. Determine the terminaon method—horizontal or vercal, concentric, or twin pipes, etc.
3. Determine proper locaon for wall or roof penetraon for each terminaon.
4. Install terminaon assembly as described in this manual or in the vent manufacturer’s installaon instrucons.
5. Install air and vent piping from water heater to terminaon.
6. Slope horizontal exhaust run towards the water heater 1/4 in per foot. DO NOT slope combuson air pipe
towards water heater.
7. Install vent supports and brackets allowing for movement from expansion, or as per vent manufacturer’s
instrucons or local code requirements.
8. Install vent screen (supplied with water heater) on PVC combuson air and exhaust terminaon elbows as
illustrated below.
• Press vent screen inside of terminaon piece/elbow.
• Secure vent screen to the elbow with screw provided.
Check to determine whether local codes supersede the
following clearances:
• Avoid terminaon locaons near a dryer vent.
• Avoid terminaon locaons near commercial
cooking exhaust.
• Avoid terminaon locaons near any air inlets.
• You must install a vent terminaon at least 12 in
above the ground or ancipated snow level.
The vent for this appliance shall not terminate:
• Over public walkways.
• Near sot vents or crawl space vents or other area
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 operaon of regulators
pressure relief valves, or other equipment.
Listed below are important consideraons for locang
vent terminaon under a sot (venlated or unvenlated
or eave vent; or to a deck or porch):
• Do not install vent terminaon under a sot vent
such that exhaust can enter the sot vent.
• Install vent terminaon such that exhaust and rising
moisture will not collect under eaves. Discoloraon
to the exterior of the building could occur if installed
too close.
• Do not install the vent terminaon too close under
the sot where it could present recirculaon of
exhaust gases back into the combuson air part of
the terminaon.
Venng Installaon Sequence
Terminaon Consideraons