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PLUMBING INSTALLATION
CAUTION: Breaker must remain off until installation is complete.
Step 1: Flush cold water line to clear any debris before connecting to unit.
Step 2: Install a shut off valve and pre filter (Not Supplied) to prevent any particles entering
the unit that may clog or damage the internal parts.
Step 3: Using flexible lines only, connect the Cold Water line to the water heater inlet
labeled with a blue ring. Connect furnished Water Valve to the water heater outlet labeled
with a red ring. Connect the HOT WATER outlet line to the Water Valve. DO NOT Solder any
fittings to unit. This will damage internal sensors and components and void the warranty.
Use flexible lines and screw fittings only to unit. A TP valve is not required in most
jurisdictions. Verify your local codes accordingly and if required install on outlet side only.
Step 4: Verify all fittings are tight and secure. Open hot water source and allow water to run
though the water heater for at least 1 to 2 minutes. This will purge the air from the water
lines and must be performed prior to turning on the power at the unit. This is a Mandatory
step to prevent Damage to Heating Elements.
Verify all connections are free of leaks.
Model
Maximum Flow Rate
Connection Size
IR-30
1.0 GPM
1/2" NPST
IR-234
1.0 GPM
1/2" NPST
IR-245
1.5 GPM
1/2" NPST
IR-260
3.0 GPM
1/2" NPST
IR-288
3.0 GPM
1/2" NPST
IR-14K220
3.6 GPM
1/2" NPST
IR-18K220
4.0 GPM
3/4" NPT