North Carolina

Average Groundwater Temperatures for the Cities in North Carolina

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.

 

North Carolina Groundwater Temperature Yearly Average

 

City Groundwater Temperatures

Charlotte

28202 |28203 | 28204 | 28205 | 28206 | 28207 | 28208 | 28209 | 28210 | 28211 | 28212 | 28213 | 28214 | 28215 | 28216 | 28217 | 28226 | 28227 | 28244 | 28262 | 28269 | 28270 | 28273 | 28277 | 28278 | 28280 | 28282

61°F.

Raleigh

27601 |27603 | 27604 | 27605 | 27606 | 27607 | 27608 | 27609 | 27610 | 27612 | 27613 | 27614 | 27615 | 27616 | 27617

62°F.

Greensboro

27401 |27403 | 27405 | 27406 | 27407 | 27408 | 27409 | 27410 | 27455

59°F.

Rocky Mount

27801 | 27803 | 27804

58°F.

Winston

27101 |27103 | 27104 | 27105 | 27106 | 27107 | 27109 | 27110 | 27127

58°F.

Durham

27701 |27703 | 27704 | 27705 | 27707 | 27709 | 27712 | 27713

62°F.

Ashville

28801 |28803 | 28804 | 28805 | 28806

62°F.

Fayetteville

28301 |28303 | 28304 | 28305 | 28306 | 28311 | 28312 | 28314

63°F.

Hickory

28601 | 28602

59°F.

Wilmington

28401 |28403 | 28405 | 28409 | 28411 | 28412

58°F.

Jacksonville

28540 | 28546

63°F.

Greenville

27834 | 27858

62°F.

Burlington

27215 | 27217

63°F.

 

New Bern

28560 | 28562

60°F.
 

What Tankless Water Heater Should you buy if you Live in North Carolina?

Since North Carolina's average temperature range is between 46°F and 54°F. It is recommended that you select a green zone or orange zone Tankless Water Heater. To see the recommended Tankless Water Heaters that apply to the orange and green 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