I don't use the compost heat mainly because I have about a million items on my to-do list and there are higher priorities at the moment. When living off the grid, our basic needs come first; food, clothing, shelter, etc. As our domain starts to mature and we can play around with luxuries, that may be one project ... one day. I would most likely focus on a hot water envelope for our stove and building solar hot water heating array before I use compost piles for heating water.