waterheaterspecs

Gas storage

Rheem ECE Gxx-50U CN HE

The Rheem ECE Gxx-50U CN HE line holds two certified rating sets of gas storage water heaters, 38 model numbers sold under four brand names, listed by Rheem Sales Company. Rated volume runs from 40 to 50 gal, and the first-hour rating runs from 88 to 95 gal; UEF spans 0.88 to 0.90 at the high draw pattern. Rheem ECE G50-50U CN HE, the set with the most model numbers, rates 0.02 below the median UEF of the 4 high-draw gas storage sets (0.90).

Certified as of October 27, 2026 · EPA ENERGY STAR data, public domain · Compare in the Heater finder

Size by size

Certified values of Rheem ECE Gxx-50U CN HE
Rating setRated volume, galFirst hour, galPer rated galUEFGas input, Btu/hTherms/yr
Rheem ECE G40-50U CN HE19 model numbers40882.200.9050,000188
Rheem ECE G50-50U CN HE19 model numbers50951.900.8850,000192

Rheem ECE Gxx-50U CN HE: first-hour rating against rated volume

Rheem ECE Gxx-50U CN HEOther gas storage sets

First-hour rating, gal

Rheem ECE Gxx-50U CN HE: first-hour rating against rated volume8012016020030405060708090100110120Rated volume, gal2×3×A. O. Smith GC6-PS4050V 1A. O. Smith GC6-PS5065V 1A. O. Smith GDHE-50 3A. O. Smith GDHE-75 3A. O. Smith HDHE-50 4A. O. Smith HDHE-75 4American PG10 34 100 2V 2GSW 6G5076NVC 1HTP PH100-119HTP PH100-55HTP PH100-80HTP PH76-50HTP PH76-60HTP PH76-80Rheem ECE G50-100U CN HE EC3Rheem ECE G50-76U CN HE EC3Rheem PROPG75-100P RH HE EC3Rheem ECE G40-50U CN HERheem ECE G50-50U CN HE
Rheem ECE Gxx-50U CN HE: first-hour rating against rated volume80120160200306090120Rated volume, galA. O. Smith GC6-PS4050V 1A. O. Smith GC6-PS5065V 1A. O. Smith GDHE-50 3A. O. Smith GDHE-75 3A. O. Smith HDHE-50 4A. O. Smith HDHE-75 4American PG10 34 100 2V 2GSW 6G5076NVC 1HTP PH100-119HTP PH100-55HTP PH100-80HTP PH76-50HTP PH76-60HTP PH76-80Rheem ECE G50-100U CN HE EC3Rheem ECE G50-76U CN HE EC3Rheem PROPG75-100P RH HE EC3Rheem ECE G40-50U CN HERheem ECE G50-50U CN HE
Filled: the two sets of Rheem ECE Gxx-50U CN HE; open circles: the other 17 gas storage sets. Dashed lines mark 2× and 3× the rated volume; the highest ratio in the line is 2.20×, on Rheem ECE G40-50U CN HE.

Across the sizes

From Rheem ECE G40-50U CN HE to Rheem ECE G50-50U CN HE, rated volume grows by 10 gal and the first-hour rating by 7 gal: 0.70 gal of first-hour output for each added rated gallon.

All sizes test at the high draw pattern, so their energy figures compare directly: Rheem ECE G40-50U CN HE lists the least, 188 therms/yr, and Rheem ECE G50-50U CN HE the most, 192 therms/yr.

Strongest placings, size by size

MeasureValueMedian of the groupPlacingCompared with
UEFRheem ECE G40-50U CN HE0.900.90highest of 4, three tied4 high-draw gas storage sets
Gas inputRheem ECE G40-50U CN HE50,000 Btu/h50,000 Btu/hlowest of 4, three tied4 gas tankless sets
UEFRheem ECE G50-50U CN HE0.880.90lowest of 44 high-draw gas storage sets
First-hour output per rated gallonRheem ECE G50-50U CN HE1.902.23lowest of 44 gas storage sets

Model numbers

The line covers 38 model numbers under four brand names, all certified 2024-11-04. An asterisk stands for a variant character in the model number.

Model numberBrandRating setHeight × diameterVentFuelRecovery efficiencyCertified
12PROG 40-50P FD HE EC3FriedrichECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventpropane97%2024-11-04
12PROG 40-50U FD HE EC3FriedrichECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventnatural gas97%2024-11-04
8PROG 40-50P FD HE EC1FriedrichECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventpropane97%2024-11-04
8PROG 40-50U FD HE EC1FriedrichECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventnatural gas97%2024-11-04
ECE G40-50U CN HE*RheemECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventnatural gas97%2024-11-04
PRO+G40-50P RH HE EC1RheemECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventpropane97%2024-11-04
PRO+G40-50U RH HE EC1RheemECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventnatural gas97%2024-11-04
PROP G40-50* CN HE**RheemECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventnatural gas or propane97%2024-11-04
PROP G40-50* RH HE EC3RheemECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventnatural gas or propane97%2024-11-04
XG40S12UHN50*RheemECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventnatural gas97%2024-11-04
XG40T09UHN50U0RheemECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventnatural gas97%2024-11-04
XP40S12UHC50*RheemECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventpropane97%2024-11-04
XP40T09UHC50U0RheemECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventpropane97%2024-11-04
12GUH40-50F*RichmondECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventnatural gas or propane97%2024-11-04
9GUH40-50FNRichmondECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventnatural gas97%2024-11-04
9GUH40-50FPRichmondECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventpropane97%2024-11-04
PRO+G40-50P RU HE EC1RuudECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventpropane97%2024-11-04
PRO+G40-50U RU HE EC1RuudECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventnatural gas97%2024-11-04
PROU G40-50* RU HE EC3RuudECE G40-50U CN HE54.5 × 21.8 inPower Direct Ventnatural gas or propane97%2024-11-04
12PROG 50-50P FD HE EC3FriedrichECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventpropane94%2024-11-04
12PROG 50-50U FD HE EC3FriedrichECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventnatural gas94%2024-11-04
8PROG 50-50P FD HE EC1FriedrichECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventpropane94%2024-11-04
8PROG 50-50U FD HE EC1FriedrichECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventnatural gas94%2024-11-04
ECE G50-50U CN HE*RheemECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventnatural gas94%2024-11-04
PRO+G50-50P RH HE EC1RheemECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventpropane94%2024-11-04
PRO+G50-50U RH HE EC1RheemECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventnatural gas94%2024-11-04
PROP G50-50* CN HE**RheemECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventnatural gas or propane94%2024-11-04
PROP G50-50* RH HE EC3RheemECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventnatural gas or propane94%2024-11-04
XG50T09UHN50U0RheemECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventnatural gas94%2024-11-04
XG50T12UHN50*RheemECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventnatural gas94%2024-11-04
XP50T09UHN50U0RheemECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventpropane94%2024-11-04
XP50T12UHC50*RheemECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventpropane94%2024-11-04
12GUH50-50F*RichmondECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventnatural gas or propane94%2024-11-04
9GUH50-50FNRichmondECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventnatural gas94%2024-11-04
9GUH50-50FPRichmondECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventpropane94%2024-11-04
PRO+G50-50P RU HE EC1RuudECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventpropane94%2024-11-04
PRO+G50-50U RU HE EC1RuudECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventnatural gas94%2024-11-04
PROU G50-50* RU HE EC3RuudECE G50-50U CN HE65.5 × 21.8 inPower Direct Ventnatural gas or propane94%2024-11-04

Nearest certified alternatives

Rating setFirst hourUEFRated volume
A. O. Smith GC6-PS4050V 1compared with Rheem ECE G40-50U CN HE−2 gal±0.00−2 gal
A. O. Smith GC6-PS5065V 1compared with Rheem ECE G40-50U CN HE+30 gal±0.00+9 gal

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