Download - AO Smith Water Heaters

Residential 

A. O. Smith 

makes an 

important 

decision easy! 

Choosing the right water heater isn't as simple as 

“one size fits all.” The size of the family, the size 

of the bathtub, and the size of the budget are 

just three factors to consider. A. O. Smith has 

taken all of these factors into account and offers an 

innovative selection of gas and electric residential 

water heaters that provide clear choices to make 

the right selection for every home. 

The very best and most efficient water heater 

money can buy is the Conservationist ® . For large 

families or homes with high hot water demand, 

ProMax ® High Recovery delivers maximum hot 

water. If utility rebates can reduce cost, ProMax ® 

High Efficiency is the right choice. Regardless of 

the model, you can be sure it’s built on a solid 

foundation of quality and innovation that’s made 

A. O. Smith water heaters the preferred brand of 

the professional plumbing contractor. 

2 

All A. O. Smith residential water heaters meet or exceed federal minimum efficiency standards effective January 20, 2004, 

according to the National Appliance Energy Conservation Act (NAECA). They also comply with the latest editions of the 

B.O.C.A. National Codes, C.E.C., U.B.C., S.B.C.C., C.A.B.O. and the HUD Standards Gas models meet American National 

Standards Institute standards (ANS Z21.10.1) governing storage type water heaters. Electric models are UL listed according 

to safety specifications outlined in Underwriters Laboratories, Inc. Standards for Safety (U.L. 174).

WATER HEATERS 

Blue Diamond 

Glass Coating 

Our Conservationist ® gas and electric water 

heaters now have the ultimate protection 

against rust and corrosion for the longest tank 

life. A. O. Smith’s Blue Diamond glass 

coating provides over twice the corrosion 

resistance compared to industry-standard 

glass lining. 

CoreGard – Advanced Anode 

Rod Protection…Now An 

Industry Standard! 

The anode rod is a highly effective corrosion fighting 

system which utilizes cathodic action to protect 

internal tank surfaces from corrosive elements. 

CoreGard adds a stainless steel core to magnesium 

or aluminum anodes for even longer life. Standard 

on Conservationist and ProMax models. 

DynaClean Automatic 

Sediment-Cleaning System 

Automatic self-cleaning action 

greatly reduces sediment accumulation 

and maximizes hot water output. 

Conservationist models are equipped with 

advanced DynaClean II, for maximum 

sediment-fighting power. ProMax ® models 

feature standard DynaClean design. 

Tamper-Resistant 

Brass Drain Valve 

Reliable, quality brass drain valve 

with “screw-slot” head to help 

prevent valve opening by curious 

youngsters. Standard on most other 

residential gas and electric models. 

PEX Dip Tubes 

A. O. Smith’s PEX cross-link polymer 

dip tubes are long-lasting with 

superior resistance to destructive 

thermal oxidation. Standard on all 

gas and electric models. 

T&P Relief Valve 

Every temperature and pressure 

relief valve is factory-supplied and 

matched to the heater to help ensure 

that every A. O. Smith residential 

water heater is installed properly. 

Intelli-Vent Power 

Gas Control Valve 

Now standard on A. O. Smith power-vent 

and power direct-vent models, this advanced 

electronic valve features polarity sensing to ensure 

proper operation, simplified diagnostics and a 

nearly indestructible silicon nitride hot surface 

igniter. 

Green Choice 

Low-NOx Burner 

Patented “eco-friendly” burner design reduces 

NOx emissions by up to 33% and complies 

with Southern California and Texas 

requirements. Standard on all gas models. 

Innovative A. O. Smith 

C3 Technology Water Heaters 

A. O. Smith 30-, 40- and 50-gallon standard atmospheric gas 

and 40- and 50-gallon Power-Vent gas water heater models now 

incorporate C3 Technology . They meet new ANS Z21.10.1 

“Flammable Vapor Ignition Resistant” standards associated with 

the accidental ignition of flammable vapors outside the water 

heater. With A. O. Smith’s non-metallic Corderite Flame Arrestor, 

C3 Technology provides an advanced level of protection and the 

industry’s most contractor-friendly design. 

3

Residential 

Water Heater 

Selection Guide 

To select the right A. O. Smith water heater for your home, you need to consider the size of your family 

and other factors that contribute to your First Hour Rating Requirement. The chart below provides suggested 

A. O. Smith Residential Water Heater selection guidelines for several family sizes. 

To Choose the Right Water Heater for You… 

1. Determine whether your family is Low Demand or High Demand. You should consider your 

family to be High Demand if... 

• There are more than two full baths in the home. 

• There are (or will be) teenagers living in the home. It’s a fact: teenagers use more hot water 

for showering and washing clothes. 

• If you have an oversize whirlpool bath or other large tub. As a rule of thumb, the water 

heater tank capacity should be 100% of the bathtub capacity (example: 75-gallon tub/ 

75-gallon water heater). 

2. Find your Family Size and Demand Profile in the chart below, and read across to find the First Hour Rating 

Requirement for your family. If you decide your family is High Demand, consider moving up to the next First 

Hour Rating level. 

3. Consult the charts on the following pages for an A. O. Smith residential water heater with a First Hour Rating 

that meets your requirement. 

FAMILY SIZE 

FIRST HOUR RATING REQUIREMENT 

2 People 45 – 55 Gallons 





7 or More People 100 or More Gallons 

Remember, these are general recommendations...your A. O. Smith Water Heater Specialist can review your family’s needs in even greater detail 

to make sure the model you choose will always provide enough hot water to meet the demand. 

4

Residential 

Gas 

Standard Vent 

GAS WATER HEATERS 

Conservationist ® 

The Conservationist, our top-of-the-line model, is fully loaded with all of A. O. Smith’s leading 

innovations. For consumers looking for maximum energy savings and excellent output, the 

Conservationist is the model of choice. 

• Highest energy factors – 2˝-thick CFC-free foam insulation, with external traps, 

specially designed “high draw” combustion chamber 

• DynaClean II automatic sediment-cleaning system – creates turbulence in tank for 

maximum protection against lime and sediment buildup 

• Blue Diamond Glass Coating – A. O. Smith innovation delivers over twice the corrosion 

resistance compared to industry-standard glass lining 

• C3 Technology “Flammable Vapor Ignition Resistant” System 

• 40,000 BTU input on all models – delivers high first hour ratings and recoveries 

• Advanced PEX cross-link polymer dip tube lasts longer than standard polymer dip tubes 

• Heat trap nipples reduce heat loss through outlet and inlet water connections (3/4˝ male) 

• Our best CoreGard magnesium anode rod with stainless steel core provides added 

protection against tank corrosion 

• Piezo igniter for easy “no-match” pilot ignition 

• Eco-friendly Green Choice gas burner reduces NOx emissions by 33% compared to 

standard burners 

• Factory-installed temperature and pressure (T&P) relief valve 

• Tamper-resistant brass drain valve 

• Extra warranty protection – 10 years on the tank and parts 

MODEL FIRST HOUR ENERGY GALLON BTU INPUT RECOVERY DIMENSIONS 

NUMBER RATING FACTOR CAPACITY PER HOUR 90°F RISE DRAFT HOOD 

GALLONS NATURAL GALLONS HEIGHT* DIAMETER OUTLET 

TALL MODELS 

XGV-40 81 .63 40 40,000 41 63-1/2 20-1/2 3 or 4 

XGV-50 97 .63 50 40,000 44 65 22 3 or 4 

SHORT MODELS 

XGVL-40 79 .63 40 40,000 43 56 22 3 or 4 

*Height to top of draft hood. 

For propane gas inputs, further detailed information on warranties and technical specifications, 

visit www.hotwater.com to view and download specifications. 

5

Residential 

Gas 

ProMax ® Plus High Recovery 

The ProMax Plus High Recovery is A. O. Smith’s “big family” gas line with larger sizes and higher 

inputs than any other. They are ideal for homes with teens or other high-demand factors. 

• Highest recoveries and first hour ratings – capacity/input combinations up 

to 98 gallons/75,100 BTU produce recoveries up to 81 gallons per hour, 

with deliverable hot water up to 150 gallons in the first hour 


• DynaClean diffuser dip tube – reduces lime and sediment buildup 


• Eco-friendly Green Choice gas burner reduces NOx emissions by 33% compared 

to standard burners 

• Piezo igniter on C3 Technology models for easy “no-match” pilot ignition 

• CoreGard aluminum anode rod with stainless steel core provides added 




• 6-year warranty on tank and parts 

• 8-year extended warranty available on 30-, 40- and 50-gallon models 

• 10-year tank warranty available on all models 

ProMax ® Plus High Efficiency 

The ProMax Plus High Efficiency is a great combination of value and savings, meeting energy 

efficiency requirements for most gas utility rebate programs. 

• High Energy Factors qualify for most gas utility rebate programs, Energy Star Home 

Program recommendations and California Title 24 requirements 


• 2˝-thick foam insulation 

• Energy-saving external heat traps 











• 8-year extended warranty available on all models 


HIGH 

RECOVERY 

HIGH 

EFFICIENCY 




GCVT-40 88 .60 38 50,000 48 58-1/2 20-1/2 4 

GCVT-50 90 .58 48 50,000 51 60-7/8 20 4 

GCVX-50 93 .58 50 65,000 67 63-7/8 22 4 

GCG-65** 112 .55 65 65,000 67 63-1/4 22 4 

FCG-75** N/A N/A 74 75,100 81 61 26-1/2 4 

FCG-100** N/A N/A 98 75,100 81 68-1/2 26-1/2† 4 

GVR-30 66 .63 30 40,000 41 62-3/8 18 3 or 4 

GVR-40 71 .62 40 40,000 41 59-7/8 20-1/2 3 or 4 

GVR 50 80 .62 50 40,000 41 60-7/8 22 3 or 4 


**Not equipped with C3 Technology. 

For 10-year tank warranty, change “G” to “X” in model number ( XCVT-40). On 75-gallon 

and 100-gallon models, change “F” to ”P” in model number (PCG-75). 

†When model ordered as propane diameter increases to 27-3/4˝. 

6 


visit www.hotwater.com to view and download specifications.


ProMax ® 

A terrific value for homes that need an economical water heater that will perform 

exceptionally well for years. 












• 8-year extended warranty available on all models 





GCV-30 66 .62 28 40,000 41 59-5/8 16 3 or 4 

GCV-40 71 .60 38 40,000 39 57-5/8 18-1/2 3 or 4 

GCV-50 91 .58 50 40,000 41 60-7/8 20 3 or 4 

GCVL-30 66 .61 30 40,000 40 48-1/8 18-1/2 3 or 4 

GCVL-40 71 .59 40 40,000 41 51-5/8 20 3 or 4 

GCVL-50 80 .58 50 40,000 41 53-1/4 24 3 or 4 


For 10-year tank warranty, change “G” to “X” in model number ( XCV-30). 

Energy-Saver Manufactured Housing 

• All models meet HUD requirements for manufactured housing installation 

• Available in standard-vent or direct-vent design 

• Convertible gas control for natural gas or propane gas operation 

• Side-mounted cold water inlet, top-mounted hot water outlet 

• Roof jack kits available for direct-vent models, with intake air 

and exhaust vents 

• Eco-friendly Green Choice gas burner reduces NOx emissions by 33% 

compared to standard burners 

• Aluminum anode rod helps protect against tank corrosion 

• External heat traps 


• Thick CFC-free foam insulation 

• 6-year tank/2-year parts warranty 

STANDARD 

ATMOSPHERIC 

VENT MODELS 

DIRECT 

VENT 

MODELS 




FMG-30 54 .61 30 30,000 31 59-1/2 18 3 

FMG-40 63 .59 40 30,000 31 60 20 3 

FMG-50 77 .58 50 38,000 39 63 22 3 or 4 

FMD-30 54 .61 30 30,000 31 56 18 - 

FMD-40 64 .59 40 32,000 33 56-1/2 20 - 

FMD-50 77 .58 50 38,000 39 56-1/2 22 - 




7

Residential 

Gas 

Specialty-Vent 

Specialty-vent gas water heaters are an alternative to standard metal-vent water heaters. 

They provide venting flexibility in replacement applications and offer useful choices for location of 

gas water heaters in new homes. Specialty-vent benefits include... 

Flexible Installation – Horizontal-venting options allow tremendous flexibility for placement of 

the water heater in the home. For example, A. O. Smith Power Shot ® power vent and Sealed 

Shot ® power direct-vent can vent up to 40 feet, using inexpensive PVC, CPVC or ABS pipe. 

Direct-venting for proper combustion – Insufficient indoor ventilation can deprive a gas 

water heater of enough air for proper operation. Sealed Shot ® power direct-vent and Sure Shot ® 

direct-vent water heaters have “two-pipe” systems that vent to and draw air from outside the 

home, eliminating concerns about indoor ventilation. 

Power Direct-Vent 

• Two-pipe “closed combustion” system permits combined horizontal and vertical venting 

and air intake runs up to 45 feet 

• Uses 3” Schedule 40 PVC, CPVC or ABS pipe 

• Quiet modular blower, with 110V/120V electrical system (rating 3 amps or less), with 

7-foot cord, standard 3-prong male connector 

• Advanced Intelli-Vent gas control valve with silicon nitride hot surface igniter (see page 3) 



• Heat Trap Nipples Installed (3/4˝ male connection) 



• Factory-installed temperature & pressure (T&P) relief valve 

• Tamper-resistant brass drain 



NUMBER RATING FACTOR CAPACITY PER HOUR 90°F RISE 

GALLONS NATURAL GALLONS HEIGHT* DIAMETER VENT CONN. 

GPDH-40 73 .59 40 40,000 41 57 21 3 

GPDH-50 80 .58 50 40.000 41 66 21 3 

GPDT-50 80 .58 50 65,000 64 69-1/2 21 3 

GPDX-75 123 .53 75 70,000 72 71-1/2 26-1/4 3 

*Height to top of blower outlets. 

8 




• Performance that rivals a 75-gallon 

gas water heater 

• Delivers “endless hot water” 

Power-Vent 

• Completely surrounded by water in tank, improves heat 

transfer surface over standard straight flue tube 

• Helps produce 90% thermal efficiency, which saves money 

on operating costs compared to a standard 78% efficient 

gas water heater 

• Versatile power-vent design allows combined vertical and 

horizontal vent runs terminating through an outside wall, 

using Schedule 40 PVC pipe 

• Modular blower equipped with 120V, 60Hz electrical system 

(rating 5 amps or less), 6-foot cord with standard 3-prong 

connector 

• Two heavy-duty commercial-grade anodes ensure 

protection against corrosion 

• Intelli-Vent gas control for more precise 

water temperature control 

• Side-mounted hot and cold recirculating taps 

• Long-lasting pex cross-link polymer diffuser dip tube 

• Six-year limited warranty on tank and parts 

* Height to top of blower outlet. 

** Distance from back of heater to front of gas valve. 

For further detailed information on warranties and technical specifications, 


9

Residential 

Gas 

ProMax ® Power-Vent 

• 40- and 50-gallon residential gas water heaters equipped with 

patented C3 Technology ® design 

• Meet Phase II of the ANSIZ21.10.1 standards for flammable vapor 

ignition resistance 

• Vent using 2, 3 or 4 Schedule 40 PVC, CPVC or ABS pipe 

• System versatility allows combined horizontal and vertical vent runs up to 

120 equivalent feet with 3 pipe, up to 160 equivalent feet with 4 pipe on 

40,000 BTU and 50,000 BTU models 

• Equipped with a nearly indestructible silicon nitride hot 

surface ignitor—no standing pilot 

• Exclusive Power-Vent blower specifically designed and manufactured 

by A. O. Smith 

• Exclusive A. O. Smith Coregard aluminum anode rod with stainless 

steel core protects tank against corrosion 

• 6-year limited warranty on tank and parts 

10 




Direct-Vent 

• One pipe/dual-channel system permits 

horizontal venting and air intake on most 

models up to 4 feet from outside wall 

• No electrical power needed 

• Eco-friendly Green Choice gas burner 

reduces NOx emissions by 33% compared 


• Heat Trap Nipples Installed 

(3/4˝ male connection) 

• CoreGard aluminum anode rod with 

stainless steel core provides added 


• Factory-installed temperature & pressure 

(T&P) relief valve 




NUMBER RATING FACTOR CAPACITY PER HOUR 90°F RISE 

GALLONS NATURAL GALLONS HEIGHT* DIAMETER VENT CONN. 

GDVS-40 68 .59 40 36,000 36 63-3/4 21 3 x 6 

GDVH-40 71 .59 40 40,000 40 63-3/4 21 3 x 6 

GDVS-50 77 .58 50 38,000 38 72-1/2 21 3 x 6 

GDVH-50 87 .58 50 48,000 49 76 21 3 x 6 

GDVH-75 109 .53 75 55,000** 52 76-1/2 26-1/4 3 x 6 

*Minimum height to top of dual-channel vent pipe. 

**Natural gas only. 



11

Residential 

Gas 

ProMax ® 

SL 

For recirculating hot water loop systems 

A. O. Smith ProMax SL “side loop” gas water heaters are designed with side-mounted recirculating 

taps for installations with combination space heating/water heating applications (such as with air 

handlers) or any system requiring a recirculating hot water loop. 

All ProMax SL water 

heaters are equipped 

with side-mounted 

recirculating taps, like 

the standard-vent 

model shown above. 

ProMax SL water heaters are available in Standard Vent (including self-cleaning DynaClean II 

models), Direct-Vent, Power-Vent and Power Direct-Vent models. All models include the following 

features: 

• Commercial-grade PermaGlas lining for longer life 

• Durable, tamper-resistant brass drain valve 

• High-temperature DynaClean II diffuser dip tube reduces lime and sediment buildup 



• Factory-supplied temperature & pressure (T&P) relief valve 

• Optional circulating loop connection assemblies available 


Standard Vent 

• Standard or self-cleaning models (equipped with advanced DynaClean II 

automatic sediment cleaning system) 

• C3 Technology system on 40- and 50-gallon models 

• Dual anode rods for superior protection against corrosion 


MODEL FIRST HOUR ENERGY GALLON BTU INPUT BTU OUTPUT RECOVERY DIMENSIONS 

NUMBER RATING FACTOR CAPACITY PER HOUR PER HOUR 90°F RISE DRAFT HOOD 

GALLONS NATURAL NATURAL GALLONS HEIGHT* DIAMETER OUTLET 

GCVH-40L 71 .59 40 40,000 29,600 40 59-7/8 18-1/2 3 or 4 

GCVT-40L 88 .60 38 50,000 35,000 48 58-1/2 20-1/2 4 

GCVT-50L 90 .58 48 50,000 38,000 51 60-7/8 20 4 

GCVX-50L 93 .58 50 65,000 50,100 67 63-7/8 22 4 

GCG-65L** 112 .55 65 65,000 49,400 67 63-1/4 22 4 

FCG-75L** N/A N/A 74 75,100 60,100 81 61 26-1/2 4 

XGV-40L 81 .63 40 40,000 30,400 41 63-1/2 20-1/2 3 or 4 

XGV-50L 97 .63 50 40,000 32,400 44 65 22 3 or 4 

GCVH-40Q 71 .59 40 40,000 29,600 40 59-7/8 18-1/2 3 or 4 

GCVT-40Q 88 .60 38 50,000 35,000 48 58-1/2 20-1/2 4 

GCVT-50Q 90 .58 48 50,000 38,000 51 60-7/8 20 4 

GCVX-50Q 93 .58 50 65,000 50,100 67 63-7/8 22 4 

GCG-65Q** 112 .55 65 65,000 49,400 67 63-1/4 22 4 

FCG-75Q** N/A N/A 74 75,100 60,100 81 61 26-1/2 4 


**Not equipped with C3 Technology. 

12 




Direct-Vent 

• Closed-combustion dual-channel vent system – draws combustion air from outside, vents to 

outside the home 

• System permits horizontal venting up to 4 feet 

• No electrical power required 


NUMBER RATING FACTOR CAPACITY PER HOUR PER HOUR 90°F RISE 

GALLONS NATURAL NATURAL GALLONS HEIGHT* DIAMETER VENT CONN. 

GDVH-40L 71 .59 40 40,000 30,000 40 63-3/4 21 3 x 6 

GDVH-50L 87 .58 50 48,000 36,480 49 76 21 3 x 6 

GDVH-75L 109 .53 75 55,000** 41,800 53 76-1/2 26-1/4 3 x 6 

*Minimum height to top of dual-channel vent pipe. 

**Natural gas only. 

Power-Vent 

• 40- and 50-gallon residential gas water heaters equipped with 

patented C3 Technology ® design and meet Phase II of the ANSIZ21.10.1 

standards for flammable vapor ignition resistance 

• Vent using 2, 3 or 4 Schedule 40 PVC, CPVC or ABS pipe 

• System versatility allows combined horizontal and vertical vent runs up to 

120 equivalent feet with 3 pipe, up to 160 equivalent feet with 4 pipe on 

40,000 BTU and 50,000 BTU models 

• Equipped with a nearly indestructible silicon nitride hot 

surface ignitor—no standing pilot 

• Exclusive Power-Vent blower specifically designed and manufactured 

by A. O. Smith 

• Exclusive A. O. Smith Coregard aluminum anode rod with stainless 

steel core protects tank against corrosion 




13

Residential 

Gas 

Power Direct-Vent 

• Closed-combustion two-pipe system 

draws combustion air from outside,vents 

to outside the home 

• Uses PVC, CPVC or ABS pipe 

• Vents up to 50 equivalent feet with 3˝ pipe 

• Quiet modular blower with 7-foot cord, 

standard 3-prong plug 

• Advanced Intelli-Vent gas control valve with 

silicon nitride hot surface igniter (see page 3) 

• Dual anode rods on 40- and 50-gallon models 


NUMBER RATING FACTOR CAPACITY PER HOUR PER HOUR 90°F RISE 

GALLONS NATURAL NATURAL GALLONS HEIGHT* DIAMETER VENT CONN. 

GPDH-40L 73 .59 40 40,000 30,000 41 57 21 3 

GPDT-50L 80 .58 50 65,000 47,500 64 69-1/2 21 3 

GPDX-75L 123 .53 75 70,000 53,200 72 71-1/2 26-1/4 3 

*Height to top of blower outlets. 

14 




XT 190L 

XT 199L 

On-Demand 

• Installed individually or in multiples from 2 units (XT-199 or XT-236 only) 

to 24 units (XT-236 only), ProStar offers an alternative way to meet 

needs of homes with extremely high hot water demand 

• Modulating input adjusts with demand: XT-190 and XT-199 modulate from 

25,000 to 190,000 BTU/Hour; XT-236 modulates from 21,000 to 236,000 

BTU/Hour 

• Energy-efficient copper heat exchanger with durable copper tube and sheet 

construction 

• Remote control offers digital display of thermostat setting, push-button 

adjustment, and indicator light for burner operation (provided with XT- 

199, XT-236, optional accessory on XT-190) 

• 10-year limited warranty on heat exchanger 

• 3-year limited warranty on parts 

XT 236L 



15

Residential 

Electric 

Conservationist ® 

The top of the line Conservationist electric water heater is fully loaded with all A. O. Smith’s 

leading innovations. For consumers looking for maximum energy savings and excellent output, 

the Conservationist is the model of choice. 

• Our most efficient electric models, for maximum savings on operating costs with 3˝ thick 

CFC-free insulation, external heat traps 

• DynaClean II automatic sediment-cleaning system – creates turbulence in tank for 

maximum protection against lime and sediment buildup 

• Blue Diamond Glass Coating – A. O. Smith innovation delivers over twice the corrosion 

resistance compared to industry-standard glass lining 

• 4500-watt Phoenix low-watt density Incoloy steel upper and lower heating elements – 

designed to operate more efficiently and last 2-3 times longer than standard copper 

elements 



• Extra warranty protection – 10 years on the tank and parts 

MODEL FIRST HOUR ENERGY GALLON ELEMENT WATTAGE DIMENSIONS 

NUMBER RATING FACTOR CAPACITY 

GALLONS STD. 240V MAX. 240V HEIGHT DIAMETER 

UPPER/LOWER UPPER/LOWER 

TALL MODELS 

PXHT-40 56 .95 40 4500 5500 60-1/2 20 

PXHT-52 60 .95 50 4500 5500 57 22-1/2 

PXHT-66 72 .95 66 4500 5500 62 24 

PXHT-80 81 .95 80 4500 5500 62 26 

SHORT MODELS 

PXHS-40 52 .95 40 4500 5500 47 22-1/2 

PXHS-50 62 .95 50 4500 5500 50 24 

Recovery capacity based on actual performance test. 

Water connections: 3/4" male NPT on all models. 

Top-mounted T&P valve not available. 

16 



ELECTRIC WATER HEATERS 

ProMax ® Plus High Efficiency 

ProMax Plus High Efficiency is a great combination of value and savings, meeting 

energy-efficiency requirements for most electric utility rebate programs. 

• Meets energy-efficiency requirements for most electric utility programs, 

Energy Star Home Program recommendations and Title 24 requirements 

• 2-1/2˝ thick CFC-free foam insulation 

• Energy-saving external heat traps (3/4˝ male connection) 

• DynaClean diffuser dip tube reduces lime and sediment buildup 




• 8-year extended warranty available on 40- through 66-gallon models 






TALL MODELS 

ECRT-40 54 .93 40 4500 6000 60 19 

ECRT-52* 60 .93 50 4500 6000 56-1/2 21-1/2 

ECRT-66 76 .93 66 4500 6000 61 23 

ECRT-80* 87 .93 80 4500 6000 61-1/2 25 

SHORT MODELS 

ECRS-50 62 .93 50 4500 6000 49 23 

Recovery capacity based on actual performance test. 

For 10-year tank warranty, change “E” to “P” in model number (PCRT-40). 

*Models not available with top T&P. 



17

Residential 

Electric 

ProMax ® 

A terrific value for homes that need an economical water heater that will perform 

exceptionally well for years. 

• Tall, Short and Lowboy (top connect) models available 


• DynaClean diffuser dip tube reduces lime and sediment buildup 




• 8-year extended warranty available on 30- through 66-gallon models 






TALL MODELS 

ECT-30** 43 .93 30 4500 6000 46-1/2 18 

ECT-40 52 .92 40 4500 6000 59-1/2 18 

ECT-52 62 .91 50 4500 6000 54 20-1/2 

ECT-55† 67 .90 55 4500 6000 60-1/4 20-1/2 

ECT66 72 .88 66 4500 6000 60-1/4 22 

ECT-80† 81 .86 80 4500 6000 60-1/2 24 

ECT-120*† 112 .81 119 4500 6000 64-1/4 28 

SHORT MODELS 

ECS-30** 43 .93 30 4500 6000 36-1/2 20-1/2 

ECS-40** 52 .92 40 4500 6000 44 20-1/2 

ECS-50** 62 .90 50 4500 6000 48 22 

LOWBOY MODELS 

ELJC-6 N/A N/A 6 1500 @ 120 2500 15-1/2 14-1/4 

ELJC-15 N/A N/A 15 1500 @ 120 2500 32-1/4 14-1/4 

ELJC-20 N/A N/A 19 2500 @ 120 6000 32-1/4 18 

ECL-30** 41 .93 29 4500 6000 30 22 

ECLN-40** 48 .92 38 4500 6000 31-1/2 23 

ECL-50** 55 .91 50 4500 6000 34 26-1/2 

Recovery capacity is based on actual performance tests. 

For 10-year tank warranty, change “E” to “P” in model number (PCT-40). 

*This model is not available with top T&P valve. 

PCL-40 and PCL-50 are not available with top T&P. 

**Models supplied with Heat Trap Nipples. 

†Models with installed Nipples. 

All water connections are 3/4" NPT. 

18 



ELECTRIC WATER HEATERS 

ProMax ® Specialty Electric 

To make the most out of limited space or deliver small amounts of hot water for small-demand 

applications, A. O. Smith offers three ProMax Specialty choices. 6-year tank and parts warranty on 

all models. 

• Table Top - Featuring convenient flat surface at 36˝ height to provide extra 

“counter space.” All plumbing and electrical connections through back of heater. 

Table Top 

Lowboy 

Point-of-Use 

• Lowboy Side Connect - Compact design, with side-mounted plumbing and electrical 

connections, for installation under a counter or in other tight spaces. 

Single heating element. 

• Point-Of-Use - For low-demand point-of-use applications. Single heating element. 

110/120V cord set with 3-prong plug. Wall mounting supplied. 



GALLONS 

STANDARD MAXIMUM HEIGHT DIAMETER 

TABLE TOP 

ESTT-30 45 .89 27 4500* 6000 36 21** 

ESTT-40 52 .88 40 4500* 6000 36 24** 

LOWBOY SIDE-CONNECT MODELS 

ELSC-10S N/A N/A 10 1500 @ 120 3000 18 18 

ELSC-15S N/A N/A 15 1500 @ 120 3000 25-3/4 18 

ELSC-20S N/A N/A 19 2500 3000 22-1/4 21-3/4 

ECJ-30 37 .93 29 4500* 6000 30 22 

ECJ-40 43 .92 40 4500* 6000 32-1/4 25 

POINT-OF-USE MODELS 

ELJC-2 N/A N/A 2 1440 @ 120V 12-3/4† 10 

ELJC-4 N/A N/A 4 1440 @ 120V 20† 10 

Dimension from floor to cold water inlet on all lowboy side-connect models is 3-1/2". 

Point-of-Use models have 1/2" inlet and outlet connections. All others are 3/4" NPT. 

*240V standard element. 

**Depth (front to back) of both table top models is 25-1/8". Width is 21" for 

ESTT-30 and 24" for ESTT-40. 

†Top mounted T&P adds approx. 3" additional to overall unit height. 

Energy Saver Manufactured Housing 

• All models meet HUD requirements for manufactured housing installation 

• Side-mounted cold water inlet and hot water outlet 

• Two heating elements on 30-, 40- and 50-gallon models 

• Aluminum anode rod for added protection against tank corrosion 



• 5-year tank/1-year parts warranty 

MODEL FIRST HOUR ENERGY GALLON STD. RECOVERY R HEIGHT DIAMETER 

NUMBER RATING FACTOR CAPACITY VOLTAGE/WATTAGE 90°F RISE VALUE 

GALLONS 

GALLONS 

ESM-20 - - 19.9 120V, 1650 Watts 8 12 34 17 

ESM-30 43 .93 30 240V, 3800 Watts 17 16 37-1/2 20-1/2 

ESM-40 51 .93 40 240V, 3800 Watts 17 16 46 20-1/2 

ESM-50 58 .95 50 240V, 3800 Watts 17 16 56 20-1/2 

All Dimensions in Inches. 

All water connections 3/4" NPT. 



19

Pump & 

Expansion Tank 

ProMax ® Pump Tanks 

• Multiple head construction adds structural strength 

and more capacity within the same diameters 

• Interior epoxy coating is permanently bonded 

to the tank shell for ultimate protection on the 

water side of the tank 

• Durable butyl diaphragm ensures long life 

• Positive lock retention system controls compression in 

the diaphragm connection, eliminating air loss or 

water leaks in tank 

• Electrostatically applied powder-coated exterior for 

maximum sunlight (UV) resistance in outside 

installations, with zinc phosphate undercoat for 

highest corrosion resistance 

• Metal air valve 

• Welded steel base 

• 5-year limited warranty 

20 



PUMP & EXPANSION TANKS 

ProMax ® Expansion Tanks 

• Multiple head construction adds structural strength and 

more capacity within the same diameters 

• Interior epoxy coating is permanently bonded to the tank 

shell for ultimate protection on the water side of the tank 

• Durable butyl diaphragm ensures long life 

• Positive lock retention system controls compression 

in the diaphragm connection, eliminating air loss 

or water leaks in tank 

• Electrostatically applied powder-coated exterior 

for maximum sunlight (UV) resistance in outside 

installations, with zinc phosphate undercoat for 

highest corrosion resistance 

• Metal air valve 

• Welded steel base 

• 5-year limited warranty on potable expansion tanks 

• 1-year limited warranty on hydronic expansion tanks 



21

Solar 

Booster Tank 

Solar Booster Tanks 

• 80- and 120-gallon electric water heaters 

specifically designed for installation as part 

of direct solar water heating systems 

• Multiple connection options for installation 

flexibility, with incoming and outgoing water 

connections through side or top of unit 

• A. O. Smith Dynaclean diffuser dip tube made 

from pex cross-linked polymer helps reduce lime 

and sediment buildup to maximize hot water output 

• A. O. Smith Permaglas ® patented glass tank coating 

helps withstand steel tank corrosion and rust 

• Durable tamper-resistant brass drain valve 

• 2˝ thick foam insulation (R-16) for high efficiency factory 

installed temperature and pressure (T&P) relief valve 


22 



NOTES 

23

Residential 

A. O. SMITH WATER HEATERS 

500 Tennessee Waltz Parkway 

Ashland City, TN 37015 

www.hotwater.com 

A.O. Smith reserves the right to make product changes or improvements at any time without notice. 

A. O. Smith reserves the right to make product changes or improvements at any time without notice. 

Form No. ARBCA00106 

October 2006R 

5M-MSI-0104 ©2006 A. O. Smith Corporation Printed in U.S.A.

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