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home made, energy star rated water tank idea.
ive got an idea, 
that came to mind having a modern electric hot water tank that has the plastic liner and foam filled out side....
how about taking a older tank and removing the insulation and using the ins-ta spray foam around the tank versus the old house type insulation.
and you have a used tank that is now much better at holding heat.... 
how much better i have not a clue other then just tossing around ball park numbers.
the other thing i been thinking about is, does the stuff that exspands less have a better R value then the sruff that exspands many times the size of the can 
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1 86 T\D trooper with rare GEN 3 rods TRANS FIXED NOW DD
1 86 4WD 5sp pup is 2.3L gas, but plan on 2.2L diesel repower
1 91 trop, long term plan is a group buy of imported Isuzu 4JB1-T 2.8L I-4 engines, hoping to get price down to 2K not 3K plus
1993 sidekick my MPG toy, epa rating 26.
i get 29/31 with stock drive train.
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