Sizing - Rheem RETEX-04T Use & Care Manual

SIZING GUIDE
!
DANGER
INCREASING THE FLOW RATE REDUCES THE OUTLET TEMPERATURE.
PLEASE BE SURE TO PROPERLY SIZE YOUR AERATOR TO PREVENT SCALDING
INLET WATER TEMPERATURE
Use the guide below to help select the right tankless water heater.
1. CONSIDER LOCATION AND SEASONAL CHANGES
Average water supply inlet temperature varies by location. Select the zone below that aligns with installation location.
2. CONFIRM THIS WILL BE ADEQUATE
Based on the zone of the installation location, confirm this product will supply enough hot water.
WATER SUPPLY INLET TEMPERATURE
Zone 1
Inlet Temp.
37-47˚F
Max. Approx.
Model
GPM Usage
3.5 kW 0.4
recommended
6.5 kW 0.7
Usage Key
Faucet
Flow rate of .5 GPM
AERATOR SUPPLIED IS .35GPM/1.3LPM
To ensure the optimal temperature output and overall
performance of your tankless water heater an aerator
supplied with heater should be installed.
Zone 2
Inlet Temp.
47-57˚F
Max. Approx.
GPM Usage
Not Not
0.5
recommended
0.9
Shower
Flow rate of 1.5 GPM
Zone 1
Zone 2
Zone 3
Zone 4
Zone 3
Inlet Temp.
57-62˚F
Max. Approx.
GPM Usage
0.6
1.0
Inlet Temp: The temperature of cold water before it enters the water heater.
GPM: Gallons Per Minute
Approx. Usage: The number of faucets and/or showers this model will
serve based on a temperature setting of 105°F. Higher temperature
settings will reduce flow rates.
4
¢
¢
¢
¢
Zone 4
Inlet Temp.
62-77˚F
Max. Approx.
GPM Usage
0.9
1.5