I have had my Hardy OWB installed about the same amount of time, about 8 weeks, and not seeing any savings on electric, about the same monthly bills. But our propane usage has dropped dramatically, my furnace and water heater are propane. We had spend $1100.00 in two fillings, one $600 bill in October getting ready for winter, and then another $500.00 bill in December right before the OWB install. The propane tank is stitting at about 44% of a 500 gallon tank, have only used about 2% in 8 weeks since burning wood. The 2% might have been used heating my water, as I have a water to water heat exchanger, but have only turned down my propane stat on the water heater about 20%. The way I have my Taco pump is on demand, it does not run 100% of the time, so my water flow is not real hot all the time. I think this is causing my water heater to kick on some and heat the water in the water tank with the propane. This is my first year so I am kind of testing some methods and watching the propane usage, although I have not heard or seen the propane water heater heating element lite up, I am pretty sure that is where my small propane usage is going.... Still saving money though, all my friends are at about $2000.00 in propane bills this year, and I love my OWB also.