Rinnai ThermaCirc360 RUR199i Installation And Operation Manual page 39

3
Common Vent
Common venting allows multiple Rinnai Tankless Water Heaters to
share the same vent system.
When operating multiple water heaters in a common venting
system, it is recommended to use Rinnai's EZ Connect cable
(purchased separately) which electronically connects two water
heaters so they function as one hot water source.
Do not common vent this water heater with any other water
heater or appliance.
Note: Multiple RUR models (water heaters with a recirculation
pump) cannot be electronically connected using the EZ Connect
cable. The EZ Connect cable connects only an RUR model with an
RU model. See illustration below.
RUR199
(With Pump)
Common Vent Maximum Equivalent Vent Lengths
Common vent equivalent lengths include polypropylene pipe (PP) or schedule 40 PVC in a back-to-back or inline
configuration.
For the table below:
•
Header is the main vent pipe into which several vents connect.
•
Vent Length is the distance from the end of the header to the
vent termination.
•
Maximum vent length starts at the end of the header system.
Water Heater
RUR199i (REU-NP3237FF-US)
RU199i(REU-N3237FF-US)
RUR160i(REU-NP2530FF-US)
RU160i(REU-N2530FF-US)
Rinnai Tankless Water Heater Installation and Operation Manual
(Indoor Units Only. Direct Vent and Non-Direct/Room Air Vent)
CORRECT
RU199
(Without Pump)
Common Vent Maximum Vent Length
# Water
Model Heaters
and
and
Sample Inline, Freestanding Configuration
RUR199
(With Pump)
Max System
BTU/HR
2 398,000
(20 m)
2 320,000
(27 m)
NOT CORRECT
RUR199
(With Pump)
Header Vent Length
Vent Diameter
3 in. 4 in.
65 ft 150 ft
(46 m)
90 ft 150 ft
(46 m)
6 in.
150 ft
(46 m)
150 ft
(46 m)
39