Texas Groundwater Temperatures

Average Groundwater Temperatures for the Cities in Texas

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.

 

Texas Groundwater Temperature Yearly Average

City and zip codes Groundwater Temperatures

Amarillo

79101 | 79102 | 79103 | 79104 | 79105 | 79106 | 79107 | 79108 | 79109 | 79110 | 79111 | 79118 | 79119 | 79121 | 79124

58°F

Abilene

79601 | 79602 | 79603 | 79605 | 79606 | 79699

64°F

Allen

75002 | 75013

62°F

Arlington

76001 | 76002 | 76006 | 76010 | 76011 | 76012 | 76013 | 76014 | 76015 | 76016 | 76017 | 76018 | 79119 | 79121 | 79124

62°F

Austin

78703 | 78704 | 78705 | 78712 | 78717 | 78719 | 78721 | 78722 | 78723 | 78724 | 78725 | 78726 | 78727 | 78728 | 78729 | 78730 | 78731 | 78732 | 78733 | 78734 | 78735 | 78736 | 78737 | 78738 | 78739 | 78739 | 78741 | 78742 | 78744 | 78745 | 78746 | 78747 | 78748 | 78749 | 78750 | 78751 | 78752 | 78753 | 78754 | 78756 | 78757 | 78758 | 78759

61°F

Beaumont

77701 | 77702 | 77703 | 77705 | 77706 | 77707 | 77708 | 77713

68°F

Bedford

76021 | 76022

60°F

Brownsville

78520 | 78521 | 78526 | 76801

62°F

Bryan

77801 | 77802 | 77803 | 77807 |  77808

63°F

Burelson

76028

62°F

Cedar Park

78613

64°F

College Station

77840  | 77845

62°F

Conroe

77301 | 77302 | 77303 | 77304 | 77306 | 77384 | 77385
59°F

Corpus Christi

78401 | 78402 | 78404 | 78405 | 78406 | 78407 | 78408 | 78409 | 78410 | 78411 | 78412 | 78413 | 78414 | 78415 | 78416 | 78417 | 78418 | 78419

64°F

Euless

76039 | 76040
62°F

Dallas/Fort Worth Metroplex

75201 | 75202 | 75203 | 75204 | 75205 | 75206 | 75207 | 75208 | 75209 | 75210 | 75211 | 75212 | 75214 | 75215 | 75216 | 75217 | 75218 | 75219 | 75220 | 75223 | 75224 | 75225 | 75226 | 75227 | 75228 | 75229 | 75230 | 75231 | 75232 | 75233 | 75234 | 75235 | 75236 | 75237 | 75238 | 75240 | 75241 | 75243 | 75244 | 75246 | 75247 | 75248 | 75249 | 75251 | 75252 | 75253 | 75254 | 75270 | 75287 | 75390 | 76102 | 76103 | 76104 | 76105 | 76106 | 76107 | 76108 | 76109 | 76110 | 76111 | 76112 | 76114 | 76115 | 76116 | 76118 | 76119 | 76120 | 76123 | 76126 | 76129 | 76131 | 76132 | 76133 | 76134 | 76135 | 76137 | 76140 | 76148 | 76155 | 76164 | 76177 | 76179

64°F

Frisco

75034 | 75035
61°F

Galveston

77550 | 77551 | 77554
62°F

Garland

75040 | 75041 | 75042 | 75043 | 75044

62°F

Grand Prarie

75050 | 75051 | 75052 | 75054

64°F

Grapevine

76051

62°F

Greater Houston

77002 | 77003 | 77004 | 77005 | 77006 | 77007 | 77008 | 77009 | 77010 | 77011 | 77012 | 77013 | 77014 | 77015 | 77016 | 77017 | 77018 | 77019 | 77020 | 77021 | 77022 | 77023 | 77024 | 77025 | 77026 | 77027 | 77028 | 77029 | 77030 | 77031 | 77032 | 77033 | 77034 | 77035 | 77036 | 77037 | 77038 | 77039 | 77040 | 77041 | 77042 | 77043 | 77044 | 77045 | 77046 | 77047 | 77048 | 77049 | 77050 | 77051 | 77053 | 77054 | 77055 | 77056 | 77057 | 77058 | 77059 | 77060 | 77061 | 77062 | 77063 | 77064 | 77065 | 77066 | 77067 | 77068 | 77069 | 77070 | 77071 | 77072 | 77073 | 77074 | 77075 | 77076 | 77077 | 77078 | 77079 | 77080 | 77081 | 77082 | 77083 | 77084 | 77085 | 77086 | 77087 | 77088 | 77089 | 77090 | 77091 | 77092 | 77093 | 77094 | 77095 | 77096 | 77098 | 77099 | 77201

66°F

Irving

75038 | 75039 | 75060 | 75061 | 75062 | 75063

63°F

Keller

76244

61°F

Killeen

76541 | 76542 | 76543 | 76549

63°F

El Paso

79901 | 79902 | 79903 | 79904 | 79905 | 79906 | 79907 | 79908 | 79911 | 79912 | 79915 | 79920 | 79922 | 79924 | 79925 | 79927 | 79928 | 79930 | 79932 | 79934 | 79935 | 79936 | 79938 | 79942 

65°F

Leander

78641 | 78645
63°F

Lewisville

75057 | 75067 | 75077

66°F

Little Elm

75068

62°F

Longview

75601 | 75602 | 75603 | 75604 | 75605

64°F

Laredo

78040 | 78041 | 78043 | 78044 | 78045 | 78046

66°F

Lubbock

79401 | 79403 | 79404 | 79406 | 79407 | 79410 | 79411 | 79412 | 79413 | 79414 | 79415 | 79416 | 79423 | 79424

64°F

Mansfield

76063
64°F

Mesquite

75149 | 75150
67°F

McAllen

78501 | 78503 | 78504

69°F

Midland

79701 | 79703 | 79705 | 79706 | 79707

68°F

New Baunfels

78130 | 78132

63°F

North Richland Hills

76180 | 76182
62°F

Odessa

79761 | 79762 | 79763 | 79764 | 79765 | 79766

68°F

Pflugerville

78660
62°F

Plano

75023 | 75024 | 75025 | 75074 | 75075 | 75093 | 75094
67°F

Richardson

75080 | 75081 | 75082

64°F

Round Rock

78664 | 78665 | 78681

66°F

Rowlett

75088 | 75089

63°F

Rusk

75785

65°F

San Angelo

76901 | 76903 | 76904 | 76905

66°F

San Marcos

78666
62°F

San Antonio

78201 | 78202 | 78203 | 78204 | 78205 | 78207 | 78208 | 78209 | 78210 | 78211 | 78212 | 78213 | 78214 | 78215 | 78216 | 78217 | 78218 | 78219 | 78220 | 78221 | 78222 | 78223 | 78224 | 78225 | 78226 | 78227 | 78228 | 78229 | 78230 | 78231 | 78232 | 78233 | 78235 | 78237 | 78238 | 78239 | 78240 | 78242 | 78243 | 78244 | 78245 | 78247 | 78248 | 78249 | 78250 | 78251 | 78252 | 78253 | 78254 | 78255 | 78256 | 78257 | 78258 | 78259 | 78260 | 78261 | 78263 | 78264 | 78266 | 77062 | 77063 | 77064 | 77065 | 77066 | 77067 | 77068 | 77069 | 77070 | 77071 | 77072 | 77073 | 77074 | 77075 | 77076 | 77077 | 77078 | 77079 | 77080 | 77081 | 77082 | 77083 | 77084 | 77085 | 77086 | 77087 | 77088 | 77089 | 77090 | 77091 | 77092 | 77093 | 77094 | 77095 | 77096 | 77098 | 77099 | 77201

68°F

Sugar Land

77478 | 77479 | 77498

64°F

Temple

76501 | 76502 | 76504 | 76508

64°F

Texas City

77590 | 77591

66°F

Tyler

75701 | 75702 | 75703 | 75704 | 75705 | 75706 | 75707 | 75708 | 75709
65°F

Victoria

77901 | 77904 | 77905

69°F

Waco

76701 | 76704 | 76705 | 76706 | 76707 | 76708 |  76710 | 76711 | 76798

69°F

Willis

77318 | 77378

68°F

Whitchita Falls

76301 | 76302 | 76305 | 76306 | 76308 | 76309 | 76310

61°F

Wylie

75098

68°F

 

What Tankless Water Heater should You buy if you live in Texas?

Since Texas's average groundwater temperature range is between 59°F and 71°F. It is recommended that you select an orange zone or red zone tankless water heater. To see the recommended tankless water heaters that apply to the orange and red 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