"desgnr" wrote in message
...
Would there be much difference in operating costs for a 40 gallon gas
water heater vs. a 30 gallon ?

--
Dell Inspiron
Pentium dual-core 2.2 GHz
2 GB DDR2 SDRAM
Windows Vista Home Premium SP1

Energy req'd=f(weight of the water)----So with all other things being equal,
increasing the tank size by 33% (10/30), one would expect to see the
operating cost go up by 33%.
MLD