6- SIZING GUIDE
Please use the chart below to see how many gallons per minute your tankless water heater can produce with your
incoming water temperature. The gallons per minute is calculated assuming 105°F outlet temperature.
Incoming
Water
Temperature
PR008240 PR011240 PR013240 PR018240 PR024240 PR027240 PR036240
40°F
0.8
1.2
1.4
1.9
2.5
2.8
3.8
45°F
0.9
1.3
1.5
2.0
2.7
3.1
4.1
50°F
1.0
1.4
1.6
2.2
3.0
3.4
4.5
55°F
1.1
1.5
1.8
2.5
3.3
3.7
4.9
60°F
1.2
1.7
2.0
2.7
3.6
4.1
5.5
65°F
1.4
1.9
2.2
3.1
4.1
4.6
6.1
70°F
1.6
2.2
2.5
3.5
4.7
5.3
7.0
75°F
1.8
2.5
3.0
4.1
5.5
6.1
8.2
80°F
2.2
3.0
3.6
4.9
6.6
7.4
9.8
(Gallons per Minute)
FLOW RESTRICTOR – OPTIONAL
In order to ensure the optimal temperature output and overall performance of your tankless water heater you may
require a flow restrictor. These flow restrictors are installed on the outlet connection of your tankless water heater and
limit the maximum volume coming out of your unit to a specified flow rate to prevent the exit temperature from
becoming too cool. To learn more about flow restrictors or find out how to purchase one for your tankless water heater
visit us online at Eemax.com or contact us at 1-800-543-6163.
Steps for Choosing a Flow Restrictor
1.
Find your model in the chart on the left
2.
Choose the column with the inlet water temperature closest to your geographical location
3.
Take the GPM or gallons per minute you find and match it with the corresponding flow restrictor on the right
*Selection based on inlet temperature above and outlet temperature of 105°F
Eemax Part Number Maximum Flow Rate
Connection Size
IFR 1-2
1.0 GPM
1/2" Compression
1.5 GPM
1/2" Compression
2.0 GPM
1/2" Compression
IFR 3-4
2.0 GPM
3/4" NPT
3.0 GPM
3/4" NPT
4.0 GPM
3/4" NPT
5.0 GPM
3/4" NPT
Inlet Water Temperature
40°F
50°F
60°F
70°F
PR008240
1.0
1.0
1.0
1.5
PR011240
1.0
1.0
1.5
2.0
PR013240
1.0
1.5
2.0
2.0
PR018240
2.0
2.0
2.0
3.0
PR024240
2.0
2.0
3.0
4.0
PR027240
2.0
3.0
4.0
5.0
PR036240
3.0
4.0
5.0
5.0
Summary of Contents for PR008240
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