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AO Smith effex water heater Review AO Smith Effex

Summary:
The Effex can save $30-35 per year, but might cost $400 more than simple box-store water heater. Payback would be 12 years. However the Effex includes powered anode rod which sells independently for more than $225. Warranty is 6 years for original owner and residential installation.
Effex plugs into outlet and possibly requires dedicated outlet to avoid interference. Surge protector is recommended.
Offsetting the long-to-improbable payback is that Effex has other benefits: service manual is available, product manual has clear maintenance steps, powered anode rod keeps tank from rusting and helps solve possible odor problems, error code shows if power anode malfunctions, digital LCD readout with error codes for simplified troubleshoot, easy temperature control at eye level, and water heater can be reset after FVIR incident instead of needing replacement.
Read detailed review
American high efficiency gas
Same as AO Smith Effex
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Review Kenmore Elite Gas water heater
Same as AO Smith Effex review

Kenmore elite product manual
Kenmore PCC water heater service handbook: Read AO Smith service handbook
Review American Residential high efficiency PCG6240
Same as AO Smith Effex review
Review State High efficiency atmospheric gas water heater
Same as AO Smith Effex review
State high efficiency product manual
Review Whirlpool High efficiency Atmospheric Vent water heater
Same as AO Smith Effex review
Whirlpool high efficiency manual
Marathon water heater Review Rheem Marathon Electric
Read detailed review

Summary:
Rheem Marathon is ordinary 240Volt residential electric water heater, except with foam tank instead of metal tank.
The purchase price is 4x ordinary water heater, and Marathon offers few advantage that cannot be achieved with less expensive water heater.
Marathon will not pay back the purchase price in most instances, but there are benefits for buyers wanting longer tank warranty for home installation, those wanting tank that can be installed in damp environment with possible reduced warranty, those needing lighter weight tank, and those experiencing chronic odor problems caused by anode rod found inside all steel-tank water heaters.
There are no toxic chemicals from Marathon water heaters.  
Whirlpool flue damper serices Review Whirlpool Flue dampered water heater made by Crastmaster/ AO Smith
Read detailed review

Whirlpool 12 year warranty offers labor for first year, and parts each year after. Phone number for warranty coverage 1-877-817-6750
However warranty sheet does not appear in product manual, so coverage is not clear. For example is warranty transferrable?
40 and 50 gallon flue-damper water heaters with EF .67 cost $271 per year to operate and save about $28 per year over ordinary EF .60 non-dampered water heater. Price about $700 for 50 gallon tank, $525 for 40 gallon tank. Payback 2-8 years compared with less efficient non-dampered series make this good offer. Payback assumes 120volt electric outlet is available. The damper and electronics require electrical outlet that should be dedicated and should be protected from electrical surge that can knock out water heater controls. This water heater is repairable following FVIR event, saving money over water heaters that must be replaced.. Plastic drain valve and air intake on bottom of heater are workmanlike. There is no specific service manual posted for water heater. Warranty is 12 years tank and parts for single-family residential installation.
Kenmore energy-star water heater Review Kenmore energy-star water heater/ Made by AO Smith
Kenmore warranty is usually printed clearly in the manual, and in year 2012, Kenmore warranty exceeds typical residential warranties offered by other vendors. 40 and 50 gallon flue-damper water heaters with EF .67 cost $271 per year to operate and save about $28 per year over ordinary EF .60 non-dampered water heater. Price about $700 for 50 gallon tank, $525 for 40 gallon tank. Payback 2-8 years compared with less efficient non-dampered series make this good offer. Payback assumes 120volt electric outlet is available. The damper and electronics require electrical outlet that should be dedicated and should be protected from electrical surge that can knock out water heater controls. This water heater is repairable following FVIR event, saving money over water heaters that must be replaced.. Plastic drain valve and air intake on bottom of heater are workmanlike. There is no specific service manual posted for water heater. Product manual has good instructions for maintaining and repairing water heater. Warranty is 6 years tank and parts for single-family residential installation.
Read detailed review
Kenmore energy-star water heater Same as American residential with flame guard Product manual
Similar to AO Smith flue damper series Sell sheet
Same as Whirlpool energy efficient 40 and 50 gallon Product manual
Review GE heat pump water heater GE heat pump water heater
Read detailed review

Repair GE heat pump water heaterThere are no service manuals posted for the GE heat pump, and GE will not connect customers to tech support, so customer cannot learn about or repair the product without paying for service. And this means you should not buy the product.

Heat pump water heaters are more expensive to buy than typical electric water heater.
Heat pump water heaters require specific maintenance that must be performed to maintain efficiency. This maintenance is in addition to typical maintenance suggested for all electric water heaters.
All costs are energy, so Heat pumps do not make economic sense for every installation.
Heat pump water heaters save money for specific applications, including 1) Homes in warm climate or with warm incoming water temperature, 2) Homes with 1-4 people who have low hot water consumption habits 3) Homes that do not require very hot water over 130°F, 4) Homes without whirlpool bath or large tub ....
... but Heat pumps only save money when 5) Heat pump unit does not require repairs.
Clean air filter at least once per year
Warranties by brand
Kenmore water heater warranty is printed in each product manual Example Kenmore water heater warranty
Rheem:  Example 6 year Rheem water heater manual from 2003
Rheem warranty claim form
Rheem parts warranty claim form
American Residential: Example American residential warranty 2006
Reliance gas water heater warranty
Rheem Marathon: Example Marathon warranty
GE Heat pump GE Hybrid water heater manual
Bradford White :Bradford White warranty policy and coverage
GE: GE water heater warranties


What do water heater warranties mean?
Unless water heater is specifically sold for commercial installation, then warranties are for original-owner, single-family, residential installation, and apply only when water heater is installed and maintained according to printed information in product manual.
Most residential warranties are non-transferrable, but when warranty is transferrable, then coverage is considerably reduced.
If water heater is not rated for commercial application, the warranty is considerably reduced when installed in commercial building or apartment. 
Warranties are broken into two parts: Tank and tank parts. Tanks are warranted not to leak during warranty period. Parts are warranted against failure due poor workmanship. There is no 100% guarantee that water heater will work flawlessly and without needing service. Every product manual says that water heater must be installed correctly and maintained
American powerflex water heater review American Powerflex water heater
Power vent. EF .67 Cost to operate $270 per year
Takes air supply from outside the home and does not work against heat-air. Can be installed inside closed room.
Brass drain valve.
1/2" gas connection.
2" foam insulation.
Factory heat traps save $2 energy cost per year but can cause clogs. Better to install own heat trap.
6 year warranty
Spec sheet
Product manual
Gas control service manual
Bradford White Flue damper series Bradford White energy factors
Bradford White flue damper series .67 EF/ same as AO Smith flue damper series
Energy Smart Review Whirlpool energy smart
Icon gas valve Honeywell icon gas control valve
Bradford White ICON gas water heater timer
Objective: Save energy
Gas valve communicates with timer and other features.
Gas valve connects to timer
Intellivent gas control Intellivent service manual
American Pacific timer Review American Pacific gas water heater timer
Review power anode rod

Anode rods by manufacturer
Review and repair Rheem FVIR
Heat pump water heaterHeat pump integrated with refrigerator

Real science at work that you can apply.
Heat from refrigerator re-used in water heater
Modest home has 88 cent energy bill
Water heater uses refrigerator heat
Low-energy home uses heat pump integrated with heat from kitchen refrigerator pg9
Water heater parts
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Avoid Tankless Hype

Pro-n-con Tankless
Troubleshoot Rheem tankless
Read side-by-side test results
Read hidden cost of tankless
American gas hybrid
Combines storage and tankless technology
Handles peak demand with no minimum flow rate and cold water sandwich.
American-size consumption.
Water heater manufacturers, brands, sellers, resources
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Kenmore/Sears water heater*
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Water heater manufacturers & sellers (cont)

Reco heaters
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Zenith water heaters














Appliance magazine :

620,000 - 650,000 water heaters are shipped each month in US read

Water heater shipments increased in April read









*Kenmore/Sears is only water heater website with customer comments about water heater products


** Indirect water heaters receive heat from external source including boiler, solar collector, wood/coal burning, and geothermal






Water heater market profile
Water heater market profile 2009- pdf
3.8 Mb file


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Write your own review, compare brands, etc


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Water heater reference chart
-Water heater reference chart

Troubleshoot Rheem tankless

Troubleshoot Bosch tankless
More facts-n-figures


Carbon footprint
Battelle Report- pdf
7.8 Mb file

Tankless gas, storage gas, storage electric compared for:
> Carbon footprint
> Efficiencies
> Life-span with and without water softener


Carbon footprint
PG&E- pdf
21 Kb file
Carbon footprint 
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