Illinois

Average Groundwater Temperatures for the Cities in Illinois

Average groundwater temperatures play an important role in determining which tankless water heater to purchase. The reason for this is because in colder climates the groundwaters starting temperature is colder than in warmer climates. This causes the tankless water heater to work harder to increase the water temperature in colder climates, which in turn causes the flow rate to decrease in parallel. For example, if the starting water temperature is 52°F and you need to raise the water temperature to 110°F. Then your tankless water heater needs to be capable of raising the water temperature by 58°F and still have enough flow to support the fixtures you want to simultaneously run.

 

How Flow Rates are Affected by Temperature

In the example below, you can see the impact that temperature has on flow rates. This example is based on a tankless water heater that has a flow rate rated for 8 GPM.

 

Temperature Zone Efficiency
+71 °F 100% (8 GPM)
61 - 70 °F 73% (5.8 GPM)
51 - 60 °F 58% (4.6 GPM)
41 - 50 °F 48% (3.8 GPM)
< 40 °F 41% (3.2 GPM)

The efficiency percentage is an average based on Siebel TempraRinnai RU199, and ECO90 tankless water heater models.

 

Flow Rates of Appliances

Based on the corresponding flow rates for each appliance that are listed. A tankless water heater that is rated with a flow rate of 8 GPM (gallons per minute) is capable of running these items at the same time in regions with an average groundwater

temperature of 72°F.

 

Shower = 3 GPM

Kitchen Sink = 1.5 GPM

Washing Machine = 2.5 GPM

Total = 7 GPM

 

If you take this same exact tankless water heater and install it in a region that has an average groundwater temperature of 52°F (green zone). This will lower that tankless water heater's max GPM output to 4.64 GPM.

 

Shower = 3 GPM

Kitchen Sink = 1.5 GPM

Total = 4.5 GPM

 

As you can see before purchasing a tankless water heater it's important to know the impact temperature has on its ability to heat water and its effect on the total GPM needs of your household.

 

Illinois Groundwater Temperature Yearly Average

City and Zip Codes Groundwater Temperatures

Aurora

60502 |60503 | 60504 | 60505 | 60506

 

Carol Stream

60188

 

Champaign

61820 | 61821 | 61822

 

Chicago

60601 |60602 | 60603 | 60604 | 60605 | 60606 | 60607 | 60608 | 60609 | 60610 | 60611 | 60612 | 60613 | 60614 | 60615 | 60616 | 60617 | 60618 | 60619 | 60620 | 60621 | 60622 | 60623 | 60624 | 60625 |60626 | 60628 | 60629 | 60630 | 60631 | 60632 | 60633 | 60634 | 60636 | 60637 | 60638 | 60639 | 60640 | 60641 | 60642 | 60643 | 60644 | 60645 | 60646 | 60647 | 60649 | 60651 | 60652 | 60653 |60654 | 60655 | 60656 | 60657 | 60659 | 60660 | 60661

 

Cicero

60804

 

Columbus

62236

 

Crystal Lake

60012 | 60014

 

Danville

61832 | 61834

 

Decatur

62521 |62522 | 62523 | 62526

 

Dekalb

60115

 

Des Plaines

60016 | 60018

 

Downers Grove

60515 | 60516

 

East Peoria

61611

 

East Saint Louis

62201 | 62203 | 62204 | 62205 | 62206 | 62207

 

Elgin

60120 | 60123 | 60124

 

Elmhurst

60126

 

Elmwood Park

61529 | 60707 

 

Evanston

60201 | 60202 | 60203

 

Glenview

60025 | 60026

 

Granite City

62040

 

Joilet

60431 | 60432 | 60433 | 60435 | 60436

 

Kankakee

60901

 

Lombard

60148

 

Melrose Park

60160 | 60164

 

Moline

61265

 

Mount Prospect

60056

 

Naperville

60540 | 60563 | 60564 | 60565

 

Oak Lawn

60453

 

Oak Park

60301 | 60302 | 60304

 

Orland Park

60462 | 60467

 

Palatine

60067 | 60074

 

Peoria

61602 |61603 | 61604 | 61605 | 61606 | 61607 | 61614 | 61615 | 61625

 

Plainfield

60544  | 60585 | 60586

 

Rockford

61101 |61102 | 61103 | 61104 | 61107 | 61108 | 61109 | 61112 | 61114

 

Romeoville

60446

 

Springfield

62701 |62702 | 62703 | 62704 | 62707 | 62711 | 62712

 

 

What Tankless Water Heater Should you Buy if you Live in Illinois?

Since Illinois' average temperature range is between 46°F and 54°F. It is recommended that you select a green zone or light blue zone Tankless Water Heater. To see the recommended Tankless Water Heaters that apply to the light blue and green zone temperatures please follow the link that corresponds to the region of your average city temperature.

 

Temperature zone Recommended Tankless Water Heater
< 40 °F Tankless Water Heater Recommendations
41 - 50 °F Tankless Water Heater Recommendations
51 - 60 °F Tankless Water Heater Recommendations
61 - 70 °F Tankless Water Heater Recommendations
+71 °F Tankless Water Heater Recommendations
 

For more information, please contact HydroFLOW Midwest