Virginia

Average Groundwater Temperatures for the Cities in Virginia

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 groundwater 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)

 

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.

Virginia Groundwater Temperature Yearly Average

City Groundwater Temperatures

Virginia Beach

23464 | 23462 | 23454 | 23452 | 23456 | 23455 | 23451 | 23453 | 23457 | 23460 | 23459 | 23461

56°F
Arlington 55°F

Norfolk

23503 | 23513 | 23518 | 23505 | 23504 | 23508 | 23502 | 23511 | 23509 | 23510 | 23523 | 23507 | 23517 | 23551

55°F

Chesapeake

23322 | 23320 | 23323 | 23321 | 23324 | 23325

54°F

Newport News

23608 | 23602 | 23606 | 23601 | 23607 | 23605 | 23603

57°F

Fairfax

22030 | 22033 | 22031 | 22032 | 22035

58°F

Richmond

23223 | 23234 | 23225 | 23224 | 23220 | 23235 | 23222 | 23227 | 23236 | 23237 | 23226 | 23221 | 23230 | 23219 | 23173 | 23250

53°F

Roanoke

24018 | 24012 | 24019 | 24017 | 24014 | 24015 | 24013 | 24016 | 24020 | 24011

52°F

Lynchburg

24502 | 24501 | 24503 | 24504

55°F

Blacksburg

24060

53°F

Winchester

22602 | 22601 | 22603

52°F

Harrisonburg

22801 | 22802 | 22807

55°F

Danville

14540 | 14541

57°F

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

Since Virginia's average temperature range is between 52°F and 58°F. It is recommended that you select a green zone Tankless Water Heater. To see the recommended Tankless Water Heaters that apply to the 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