We used the unit to fill a working fireplace with a leaky chimney that had to be sealed or have a costly repair. We sealed it. We investigated ventless gas logs. We have no gas and so that was a significant cost. After lots of research we decided to take the risk and ordered the Dimplex. I remember reading a review about a guy who tossed paper into his forgetting it was not a real fire. That is how we feel too. Very satisfied after one month that started with the A/C on and is ending with heating our living room with our Dimplex.