2015
Did not see this on your web site ....   It is not a very big new story but will be when in May of 2015 people go to replace their existing 80 gallon and find out the cheap + simple electric water heaters don't exist anymore in the larger size.

http://www.bradfordwhite.com/sites/default/files/pdf/2013-0913_BWC-DOE%202015-article.pdf

And this is not making some utilities very happy ....

http://www.aceee.org/files/pdf/conferences/hwf/2013/2C-dennis.pdf

Then they will find out the heatpumps don't work when installed in a closet because they need air flow, make more noise, have moving parts, condensate drain, headache, hassle.

This summer I bought a marathon 105 to put my excess 15-25Kw of solar PV energy into so Im set.   If I was one year late I think I would be screwed.  

I urge anyone eyeing a large water heater or having a large water heater to consider buying one before the most inexpensive energy storage device on the planet are banhammered out of existence.

Thanks for your great website. 
-Dave
Several ideas spew from my head
Top 15

1) Two 40 gallon water heaters give more control than one 80 gallon heater
http://waterheatertimer.org/Two-water-heaters.html

2) Commercial water heaters will never be limited in size

3) I will post pdfs.
Thanks Dave

4) They predicted end of planet with 3-gallon flush toilet.

5) I prefer electric water heaters for control and repair.

6) I have 3 extra electric water heaters in barn... so a forest fire will destroy them and insurance will not pay.

7) I purchased extra parts for water heater since new thermostats and elements will be electronic

8) Glad you have your water heater. I like concept of marathon heaters.
0) There are worst things. I am disabled with arthritis, COPD, can't hear and it hard to eat and talk and sleep and shower... and I'm mostly home bound... with 2-4 years left to live.
The weather's nice today.

11) Why do they mandate CFL light bulbs but allow 72" TVs.
Maybe because cheap light bulbs do not make as much profit as CFLs and football?

12) New top-line gas and electric water heaters are available with wifi module, so water heater can be controlled with phone.
Home Depot sells the module.
So water heaters will emit data to-and-from phone ... requiring service provider... who will send advertisements each time water heater is accessed... and errors will go to plumbing providers who will send offers to fix water heater... and maybe water heater will beep until service is rendered.

14) You're right... heat pumps do not save money. Noisy, annoying, expensive parts, maintenance etc

15) Why do they ban 80 gallon heaters, but allow tankless electric heaters... maybe Rheem and Bosch are making a large profit from wasteful tankless electric ... but not much profit from 80 gallon electric... and government needs to pass energy-saving mandate... ah so the compromise was made.
> 1) Two 40 gallon water heaters give more control than one 80 gallon heater
> http://waterheatertimer.org/Two-water-heaters.html
>
I agree especially for my solar application since I alternate between feeding 120 and 240VDC to the elements.  Multiple heaters would
give me more control.    If I could fit two 50's in my furnace room closet I would have gone for it but they don't.
The 105 barely fit in there.   If I had a big attached garage I would put three 105s in there and have over a weeks supply of hot water.
 
>
> 2) Commercial water heaters will never be limited in size
>
I was looking at those.  They even make a Marthon heavy duty commercial with up to 4 elements.    Beyond my budget.   The 120 gallon Bradford White was in the running but it was 300lbs and 500$ more than the 105.
 
>
> 3) I will post pdfs.
> Thanks Dave
Because my chickens need 100W incandescent lights to stay warm at night and they want my chicks to freeze?

TV is needed to program the Sheeple.  Bigger the better.  Its all about priorities. :)
Why do they ban 80 gallon heaters, but allow tankless electric heaters... maybe Rheem and Bosch are making a large profit from wasteful tankless electric ... but not much profit from 80 gallon electric... and government needs to pass energy-saving mandate... ah so the compromise was made.
>

Makes a lot of sense.

I also suspect that the plumbers don't like Marathon water heaters.  Its better for business to replace a steel tank every 6-10 years or sell a high maintenance tankless.    When the heat pump tech is eventually mandated for the standard 50 gal its going to be a plumbers business bonanza on the unit base price and increased install costs.  Harder to DIY install.

I wonder what lobby group pushed for this? 
 
You should glimpse Rheem's business model.

End DIY
No service manuals online
Sell only proprietary parts
Customers funneled to large plumbing companies that subcontract repairs
Large companies selling only Rheem because they get repair work
Rheem is forcing more control each time I visit

^^^^^^^^^^^^^^^

Most recent marathon manual does NOT show part numbers.
Takes 1-7/8" socket

Marathon elements burn out frequently.
Upper and lower elements are different.
Each element must be matched to model number

Thermostats have higher thermostat range

Let me channel to my site;
http://waterheatertimer.org/How-to-replace-water-heater-element.html#marathon
http://waterheatertimer.org/pdf/Rheem-Marathon-parts-2.pdf

^^^^^^^^^^^^^

Thinking at the top today revolves around 'incentivizing' the wrong people [you and me]
Basic idea is we will not turn down thermostat for $2 a month.
But if one company controls water heaters for a million people, then that's $2 million each month
50,000,000 water heaters in US x $2 each month

^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The problem is:
Science is multidimensional... befuddles decision to buy
Advertising is linear or 2-dimentional ... making purchase clear-cut.

So which will congress choose?
Fast dollars or science dullards

Voila... heat pumps !!

^^^^^^^^^^^^^^^^^^^^^

But... no water means no electricity
We should consider solar-assisted instead of heat pump
Except solar is free... and rheem can't ream you over solar
So congress, in good conscience, cannot vote solar
    Marathon elements burn out frequently.
    Upper and lower elements are different.
    Each element must be matched to model number

 Thermostats have higher thermostat range

I read somewhere that the initial versions of the marathon came with a standard lower element.  Now the lower element is titanium and the upper is standard.   The difference between the heavy duty and the standard water heater is the heavy duty has upper and lower titanium and the upper and lower thermostats go all the way to 170 instead of the 150 range.   Ive been hesitant to change them out for the high range and run at 170.  Concerned the minerals will precipitate out more at 170 than 150.  The water is not hard but alkaline.  Leaks in plumbing crust over and seal themselves up automatically.
 
I attach 3 graphs from my monitor program.  I have an owserver made by eds and a couple of 1 wire sensors installed on the thermo back plate.   The conduit between the electrical junction box and the upper/lower made routing custom stuff like this super easy.
The data acquired is all "contained".  Doesn't escape into the cloud ... except of course these 3 jpgs   ;-)
    Except solar is free... and rheem can't ream you over solar
    So congress, in good conscience, cannot vote solar


Yup, I agree.  And congress can't get payola if Rheem doesn't make money.

I was going to ask you if you have seen or heard anything about the PV solar controller sold at ...