Water heater dia.is 19" what is the curcum. of the water heater. heigh is 4feet.nothing more to add

Probably
AO Smith ECS-30 30 gallon
36 1/2" tall, 20-1/2" diameter,
http://www.hotwater.com/water-heaters/residential/conventional/electric/promax/promax-electric-tank-water-heater-eclb-40/#lit

Gene

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1) Buy 3600 watt element. Nothing special needed:
Copy following link to identify type of element:
http://waterheatertimer.org/How-to-replace-water-heater-element.html

2) March 2013: Add a comment and describe the water heater and the element.

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10-19-12
Please add comment, and include model, brand, and type of appliance or water heater so expert can access manual

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Today's water heaters have more insulation and are larger.

Reliance does not have a water heater 20 x 38.
http://www.reliancewaterheaters.com/lit/spec/electric/R606E0312.pdf

I checked several manufacturers.

American Water Heater has 18 x 38-1/2"
Model #E62-30H-045DV
Shipping weight 77 lbs, but I don't know who sells it.
http://www.americanwaterheater.com/products/pdf/NRESS00308.pdf

Whirlpool from Lowes has a 30 gallon
18" x 45"

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Problem could be air supply, gas supply, venting, part failure or combination of listed things.

Best place to start is manual.
http://www.boschhotwater.com/BoschModel1600H/FeaturesandSpecs/tabid/1024/Default.aspx

Typical 1600 manual shows troubleshoot starting page 19
http://www.boschhotwater.com/Portals/7/TechManuals/1600H_English_0606.pdf

Bosch has online tech support form:
http://forms.boschhotwater.com/Home/BoschTechSupportForm/tabid/614/Default.aspx

BOSCH error codes:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

The smell is from bacteria.
1) The tank needs a new anode rod, but it also needs a periodic dose of hydrogen peroxide.
Recommend you reconfigure incoming water pipes where you can easily add 2 bottles of hydrogen peroxide and then flush water heater each 6 months. The peroxide kills the bacteria. Peroxide is not harmful to you since it is also used orally. You don't drink a bottle of peroxide, but it will not cause harm in trace amounts left in water heater.
2) There is something else to consider. If yours is a 12-year tank or lifetime tank, then you probably have 2 anode rods. Replacing one anode rod will not solve problem.
3) Another solution is a power anode rod. If your tank has two anode rods, then replace one with powered anode, and then remove the second anode rod.
According to the seller, he's had only one person where the water heater smell came back.


Here are links to information and to the powered anode rod:
http://www.waterheatertimer.org/Replace-anode-rod.html
http://www.waterheaterrescue.com/pages/WHRpages/English/OrderPages/XCart/Power-Anode.html

Manufacturers are starting to add powered anode rods to their top models to assure longer tank life and better customer satisfaction.

Add a comment if you need more help.

there is a small dia copper pipe which has a thermal coupling on it the end of it sits in the flame of the pilot light,
if it fails which it does after about 25-15 months,it shuts down the gas burner

I haven't one of these type before.Is this a tankless heater or tank heater .