High Efficiency Gas Water Heaters Review

An overview of the high-efficiency gas water heaters built by the major manufacturers of water heating products in the US and Canada. Check out the available types and models, capacity and energy factors of the gas-powered tank-type water heaters.

Energy Star

All the listed high-efficiency water heaters below are also Energy Star approved, making them eligible for the rebates and tax breaks. One water heater is considered Energy Star as long as the Energy Factor (EF) and First Hour Rating meet the requirements.

High efficiency means that more energy is transferred to water, less energy is lost, and less carbon dioxide is emitted.

The EF is used to measure the efficiency of the water heater, and the higher it is, the lower the operating costs are. The bigger the number, the more efficient model is.

Important things to know when buying a new water heater

With approximately 15-20% annual energy consumption, water heating is the second-largest energy consumer in an average US household, right after heating and air conditioning (about 45%).

Electric appliances spend roughly two times more energy than gas. They have higher efficiency, but the high cost per BTU makes it expensive to run.

Water heaters today are much more efficient than old ones. Older models have an efficiency of 50-60%, while new condensing models can easily go over 90%. The efficiency is even better with hybrid technologies, such as hybrid electric water heaters, which combine heat pumps and electric heating elements.

If you want to buy a tank-type water heater, check its energy-related features. High efficient models have 2-3” thick foam insulation with an R-value around 20. They also include heat traps, induced draft, power or power-direct venting system, modulating gas valve, and advanced electronics. Some homeowners use insulation blankets to reduce the standby heat loss.

Always read the information found on the Energy Guide label, where you can find energy-related info so you can compare the energy efficiency of different models. It contains info such as the approximate annual operating cost and estimates of its annual energy use.

The Energy Factor (EF), which measures the efficiency, ranges from 0.5 to 1 in conventional water heaters, while it can go even four times more in heat pumps or hybrids. Low efficient models have an efficiency around 50-60%, mid-efficient around 70-80%, and high efficiency over 90%.

Keep in mind that water heaters with the higher energy factor cost more but save more energy and money in the long run and when compare to the standard-type models. According to energystar.gov, high-efficiency gas water heaters use 10-15% less energy than conventional models.

American

Natural Gas Liquid Propane
PCG62-40T40-3NOV PCG62-40T40-3PV
PCG62-50T40-3NOV PCG62-50T40-3PV
PVG62-40T42-NV PVG62-40T42-PV
PVG62-50T42-NV PVG62-50T42-PV
PVG62-50T60-NV PVG62-50T60-PV
PDVG62-40T42-NV PDVG62-40T42-PV
PDVG62-50T42-NV PDVG62-50T42-PV
PDVG62-50T60-NV PDVG62-50T60-PV
PG10 50-199-3NV PG10 50-199-3PV

AO Smith

Natural gas Propane gas
GPNH-50 GPVT-50 (LP)
GPVL-50 GPVL-50 (LP)
GPDT-50 GPVT-40 (LP)
GPDX-50L GPVL-40 (LP)
GPVT-50 GPDL-40 (LP)
GPVT-40 GPDL-40L (LP)
GPVL-40 GCF-50 (LP)
GPNH-40 GCFL-40 (LP)
GPDL-40 GCF-40 (LP)
GDHE-75 GDHE-75 (LP) 
GPDL-40L GPDT-50 (LP)
GDHE-50 GDHE-50 (LP)
GCF-50  
GCFL-50  
GUF-50  
GUF-40  
GCFL-40  
GCF-40  

Bradford White

Model Model
Number
Capacity
(Gallons)
Energy
Factor
(EF)
High EF
Atmospheric Vent 
Damper Energy Saver
D-4-403S6FBN60 40 0.67
D-4-504S6FBN 50
TTW
Power Vented 
High EF 
Energy Saver
M-4-TW40T6FBN 40
M-4-TW50T6FBN 50
M-4-TW60T6FBN 60
TTW Extra Recovery
Power Vented High EF
M-4-XRTW50T6FBN 50
M-4-XRTW65T6FBN 65
PDX4 Power 
Direct Vent
PDX4-40S6FBN 40
PDX4-50S6FBN 50
Eco-Defender Safety 
System Ultra Low Nox 
TTW Power Vented
High EF
U-4-TW-40T6FRN 40
U-4-TW-50T6FRN 50
U-4-TW-60T6FRN 60
TTW Extra Recovery 
Ultra Low Nox
Power Vent High EF
U-4-XRTW50T6FRN 50
U-4-XRTW65T6FRN 65

GE

Model Model
Number
Capacity
(Gallons)
Energy
Factor
(EF)
GE Atmospheric SG40T12TVT 38 0.69
GG40T06TVT 38
GG40S06TVT 40 0.67
SG50T12TVT 50 0.68
GG50T06TVT 50 0.68
GG50S06TVT 50 0.67
GE Power Vent GG40T06PVT 40 0.67
GG50T06PVT 50

Kenmore

Model Model
Number
Capacity
(Gallons)
Energy
Factor
(EF)
Kenmore
Elite -12
33262 40 0.70
33264 50
Kenmore - 6 33702 40 0.67
33704 50

Rheem

Model Model
Number
Capacity
(Gallons)
Energy
Factor
(EF)
XR90 43V30-60 29 0.70
Professional Powered Damper PRO40E2 38 0.69
PRO50E2 50 0.67
PRO50-50E2 50
PRO40SE2 - Short 40
PRO50SE2 - Short 50
Fury Powered Damper 43V40E2 38 0.69
43V50E2 50 0.67
43V50-50E2 50
43V40SE2 - Short 40
43V50SE2 - Short 50
High-Efficiency Condensing 
Power Direct Vent
RHE50 48 0.80
RHE40S - Short 38
Standard Power Direct Vent PDV40 40 0.67
PDV50 50
Power Vent 43VP40E2 40 0.67
43VP50E2 50
43VP40SE2 - Short 40
43VP50SE2 - Short 50
42VP40FN - Short 40
42VP50FN - Short 50
Power Vent with Electronic Control 43VP40E2-E 40 0.67
43VP50E2-E 50
Professional Ultra Low NOx Powered 
Damper
PRO40NE2 40 0.68
PRO50NE2 50

Fury Ultra Low NOx Powered Damper
23V40NE2 40 0.68
23V50NE2 50

State

Model Model
Number
Capacity
(Gallons)
Energy
Factor
(EF)
Premier HE GP6 40 YPCT 40 0.70
GP6 50 YPCT 50
HE w/Flue Damper GS6 40 YBFT 40 0.67
GS6 50 YBFT 50
GS6 40 YBFS - Short 40
Select Power Vent GS6 40 YBVIT 2 40 0.67
GS6 50 YBVIT 2 50

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