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RV53i & RV53e Operation and Installation Manual 

23 

  Recommended Piping for Circulation Systems

Pressure Relief Valve

3/4" Ball Valve

3/4" Union

Check Valve

S

Pressure Regulator

Circulating Pump

Solenoid Valve

Boiler Drain Valve

Minimum 3/4" Cold Water Supply Line

Electric Water

Heater

Building

Fixtures

Building Supply

Expansion Tank

Gas Supply

QTY

1

1

Rinnai
Equipment List

Rinnai
Water Heaters

RIK-KIT (Optional)
(3/4" Fittings Include:
2 Unions, 2 Ball Valves,
2 Drain Valves and
1 Pressure Relief Valve.)

3/4" Gas Connection

Tank Water Heater to be Sized for
Heat Loss of Circulation Loop.

Pump should be controlled by an Aqua-
stat, Timer or Combination Aquastat and
Timer.
Pump to be sized to maintain circulation
loop temperature.
The pump should be sized to overcome
the pressure loss through the tank water
heater, and supply and return plumbing.
Reference the Rinnai Hot Water System
Design Manual, Pump Sizing for Circula-
tion.
Pump to be of bronze or stainless
construction.

This is not an engineered drawing.  It is intended only as a guide and not
as a replacement for professionally engineered project drawings. This
drawing is not intended to describe a complete system.  It is up to the
contractor/engineer to determine the necessary components and
configuration of the particular system being installed. This drawing does
not imply compliance with local building code requirements.  It is the
responsibility of the contractor/engineer to ensure installation is in
accordance with all local building codes.  Confer with local building
officials before installation.

IMPORTANT: Connect the building
return line to the hot water supply line
as close as possible to the Rinnai Water
Heater.

NOTE:
For residential and commercial
applications, this piping arrange-
ment maintains full warranty.

This piping arrangement maintains 
full warranty.