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ElectricalEngineerfor30years- As a mechanical engineer, I think you are right about this being a waste of money to use on a boiler, however as Hurricane 101 said that there are processes that this machine can be useful for. For a boiler, there are going to be losses due to heat transfer across the system boundary. How the ElectraTherm is actually implemented directly impacts its benefit. You claim lengthy ROI's for a machine with this use, however if you calculate the ROI it is much less than a decade. Making the assumption, of course, that you are truly using the machine for its designed purpose and extracting WASTE heat. We will then calculate the break even time. The following are the parameters: Initial cost~$128,000 Output~50 kW-hr Average Cost of electricity~$0.11/kW-hr (DOE website) (50 kW-hr)*($.11/kW-hr)=$5.50 This is the cost of energy per hour of operation. $128,000/($5.50/hr)=23272 hours=969.7 days=2.66 years This is the break even time. The ROI will depend on the length of time required by the machine life cycle. I am willing to bet that even with some maintenance (which I am not really sure how much quality control has gone into these) the break even will not exceed 6 years. Now to understand how it is useful Hurricane 101 gave some good examples of where there is a large amount of wasted heat. It is all about the application you use it in. You wouldn't use a toaster to cook your steak would you? Food for thought.