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These heaters are economic, useful, easy to install and use. I researched for over six months and the Envi turned out to be the winner for cost, heat, and quality. I purchased two. Installed them, and checked out my heating bill. The savings paid for itself in three months. As a result, I ditched the plan to install a $8,000 central heating system. The small home that needed heat has been kept warm with three Envi heaters, and our heating bill has 1/3 the cost of propane. There is a reason these Envi heaters are loved. They work silently, safely, and economically.