Minnesota

Average Groundwater Temperatures for the Cities in Minnesota

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.

 

Minnesota Groundwater Temperature Yearly Average

 

City and Zip Codes Groundwater Temperatures

Andover

55304

45°F

Anoka

55303

45°F

Bemidji

56601

47°F

Big Falls

56101

48°F

Big Lake

55309

41°F

Brainerd

56401

41°F

Burnsville

55337 

47°F

Chaska

55318

41°F

Circle Pines

55104

42°F

Cloquet

55720

47°F

Cottage Grove

55016

45°F

Detroit Lakes

56501

42°F

Duluth

55802 |55803 | 55804 | 55805 | 55806 | 55807 | 55808 | 55810 | 55811 | 55812 | 55814 

39°F

East Grand Forks

56721

45°F

Eden Praire

55344 | 55347 | 55329

44°F

Elk River

55330

47°F

Excelsior

55331

47°F

Fairbault

55021

48°F

Farmington

55024

43°F

Fergus Falls

56537

49°F

Forest Lake

55025

49°F

Grand Rapids

55744

44°F

Hastings

55033

40°F

Hopkins

55305 | 55343

42°F

Inver Grove Heights

55076 | 55077

49°F

Istani

55040

48°F

Lakeville

55044

48°F

Little Falls

56345

42°F

Manikato

56001 | 56003

43°F

Maple Grove

55311

42°F

Minnetonka

55345 

42°F

Minneapolis

55401 | 55402 | 55403 | 55404 | 55405 | 55406 | 55407 | 55408 | 55409 | 55410 | 55411 | 55412 | 55413 | 55414 | 55415 | 55416 | 55417 | 55418 | 55419 | 55420 | 55421 | 55422 | 55423 | 55424 | 55425 | 55426 | 55427 | 55428 | 55429 | 55430 | 55431 | 55432 | 55433 | 55434 | 55435 | 55436 | 55437 | 55438 | 55439 | 55441 | 55442 | 55443 | 55444 | 55445 | 55446 | 55447 | 55448 | 55449 | 55450 | 55454

49°F

Moorehead

56560

42°F

Northfield

55057

48°F

Osseo

55369

48°F

Owatoona

55060

47°F

Prior Lake

55372

45°F

Red Wing

55066

49°F

Rochester

55901 |55902 | 55904 | 55905 | 55906

49°F

Rosemount

55068

46°F

Saint Cloud

56301 | 56303 | 56304

48°F

Saint Paul

55101 | 55102 | 55103 | 55104 | 55105 | 55106 | 55107 | 55108 | 55109 | 55110 | 55111 | 55112 | 55113 | 55114 | 55115 | 55116 | 55117 | 55118 | 55119 | 55120 | 55121 | 55122 | 55123 | 55124 | 55125 | 55126 | 55127 | 55128 | 55129 | 55130 | 55155 

49°F

Savage

55378

44°F

Shakopee

55379

48°F

Stillwater

55082

44°F

Windom

56101

45°F

Willmar

56201

49°F

Winona

55987

43°F

Worthington

56187

42°F

Zimmerman

55398

41°F

What Tankless Water Heater Should you buy if you Live in Minnesota?

Since Minnesota's average temperature range is between 38°F and 49°F. It is recommended that you select a light blue zone or dark blue Tankless Water Heater. To see the recommended Tankless Water Heaters that apply to the light blue and dark blue zone temperatures please follow the link that corresponds to the region of your average groundwater 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