waterheaterspecs

Gas storage, residential-duty commercial

Rheem ECE G50-xxU CN HE EC3

The Rheem ECE G50-xxU CN HE EC3 line holds two certified rating sets of residential-duty commercial gas storage water heaters, 18 model numbers sold under four brand names, listed by Rheem Sales Company. Rated volume is 50 gal for every set, and the first-hour rating runs from 136 to 167 gal; every set rates UEF 0.89. Rheem ECE G50-100U CN HE EC3 lists 3.34 gal of first-hour output per rated gallon, the third highest of the 15 residential-duty commercial gas storage sets. Rheem ECE G50-100U CN HE EC3 lists 190 therms/yr, the fifth lowest of the 15 high-draw residential-duty commercial gas storage sets (shared by three sets).

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 G50-xxU CN HE EC3
Rating setRated volume, galFirst hour, galPer rated galUEFGas input, Btu/hTherms/yr
Rheem ECE G50-76U CN HE EC39 model numbers501362.720.8976,000190
Rheem ECE G50-100U CN HE EC39 model numbers501673.340.89100,000190

Rheem ECE G50-xxU CN HE EC3: first-hour rating against rated volume

Rheem ECE G50-xxU CN HE EC3Other gas storage sets

First-hour rating, gal

Rheem ECE G50-xxU CN HE EC3: 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 G40-50U CN HERheem ECE G50-50U CN HERheem PROPG75-100P RH HE EC3Rheem ECE G50-76U CN HE EC3Rheem ECE G50-100U CN HE EC3
Rheem ECE G50-xxU CN HE EC3: 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 G40-50U CN HERheem ECE G50-50U CN HERheem PROPG75-100P RH HE EC3Rheem ECE G50-76U CN HE EC3Rheem ECE G50-100U CN HE EC3
Filled: the two sets of Rheem ECE G50-xxU CN HE EC3; open circles: the other 17 gas storage sets. Dashed lines mark 2× and 3× the rated volume; the highest ratio in the line is 3.34×, on Rheem ECE G50-100U CN HE EC3.

Across the sizes

At 50 gal of rated volume the line has two sets (ECE G50-76U CN HE EC3 and ECE G50-100U CN HE EC3), which differ in first-hour rating and gas input.

Strongest placings, size by size

MeasureValueMedian of the groupPlacingCompared with
Gas inputRheem ECE G50-76U CN HE EC376,000 Btu/h100,000 Btu/hlowest of 15, five tied15 gas tankless sets
UEFRheem ECE G50-76U CN HE EC30.890.88fifth highest of 15, three tied15 high-draw residential-duty commercial gas storage sets
Gas inputRheem ECE G50-100U CN HE EC3100,000 Btu/h100,000 Btu/hhighest of 15, ten tied15 gas tankless sets
First-hour output per rated gallonRheem ECE G50-100U CN HE EC33.342.65third highest of 1515 residential-duty commercial gas storage sets

Model numbers

The line covers 18 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 50-76P FD HE EC3FriedrichECE G50-76U CN HE EC365.5 × 21.8 inPower Direct Ventpropane95%2024-11-04
12PROG 50-76U FD HE EC3FriedrichECE G50-76U CN HE EC365.5 × 21.8 inPower Direct Ventnatural gas95%2024-11-04
ECE G50-76U CN HE EC3RheemECE G50-76U CN HE EC365.5 × 21.8 inPower Direct Ventnatural gas95%2024-11-04
PROP G50-76* CN HE EC3RheemECE G50-76U CN HE EC365.5 × 21.8 inPower Direct Ventnatural gas or propane95%2024-11-04
PROP G50-76* RH HE EC3RheemECE G50-76U CN HE EC365.5 × 21.8 inPower Direct Ventnatural gas or propane95%2024-11-04
XG50T12UHN76*0RheemECE G50-76U CN HE EC365.5 × 21.8 inPower Direct Ventnatural gas95%2024-11-04
XP50T12UHC76U0RheemECE G50-76U CN HE EC365.5 × 21.8 inPower Direct Ventpropane95%2024-11-04
12GUH50-76F*RichmondECE G50-76U CN HE EC365.5 × 21.8 inPower Direct Ventnatural gas or propane95%2024-11-04
PROU G50-76* RU HE EC3RuudECE G50-76U CN HE EC365.5 × 21.8 inPower Direct Ventnatural gas or propane95%2024-11-04
12PROG 50-100P FD HE EC3FriedrichECE G50-100U CN HE EC365.5 × 21.8 inPower Direct Ventpropane96%2024-11-04
12PROG 50-100U FD HE EC3FriedrichECE G50-100U CN HE EC365.5 × 21.8 inPower Direct Ventnatural gas96%2024-11-04
ECE G50-100U CN HE EC3RheemECE G50-100U CN HE EC365.5 × 21.8 inPower Direct Ventnatural gas96%2024-11-04
PROP G50-100* CN HE EC3RheemECE G50-100U CN HE EC365.5 × 21.8 inPower Direct Ventnatural gas or propane96%2024-11-04
PROP G50-100* RH HE EC3RheemECE G50-100U CN HE EC365.5 × 21.8 inPower Direct Ventnatural gas or propane96%2024-11-04
XG50T12UHN100*0RheemECE G50-100U CN HE EC365.5 × 21.8 inPower Direct Ventnatural gas96%2024-11-04
XP50T12UHC100U0RheemECE G50-100U CN HE EC365.5 × 21.8 inPower Direct Ventpropane96%2024-11-04
12GUH50-100F*RichmondECE G50-100U CN HE EC365.5 × 21.8 inPower Direct Ventnatural gas or propane96%2024-11-04
PROU G50-100* RU HE EC3RuudECE G50-100U CN HE EC365.5 × 21.8 inPower Direct Ventnatural gas or propane96%2024-11-04

Nearest certified alternatives

Rating setFirst hourUEFRated volume
GSW 6G5076NVC 1compared with Rheem ECE G50-76U CN HE EC3−17 gal−0.01−2 gal
A. O. Smith HDHE-50 4compared with Rheem ECE G50-76U CN HE EC3−18 gal−0.01−1 gal
HTP PH76-50compared with Rheem ECE G50-76U CN HE EC3+18 gal+0.01−2 gal
HTP PH76-60compared with Rheem ECE G50-76U CN HE EC3+21 gal−0.01+8 gal
American PG10 34 100 2V 2compared with Rheem ECE G50-100U CN HE EC3+3 gal+0.01−17 gal

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