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Im not sure what model/brand you have, simpler is better INHO .the units I use have all the good stuff to make them more efficient increasing the %of savings to 92+% over the 80+% that a tank type WH are rated for . they both make hot water one saves more $ on the monthly bill and has a much longer pay back for initial investment ECO or not. one has been made the same way for years so it should be better on the ECO . with a 12% savings on gas the 3600 additional cost should pay off in about OOH 35 years give or take 5 yrs ---SO ECO!
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