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Handy. In effect this is what tc is doing, however rather than using hot water he is using the fire direct. Unless my understanding is incorrect (I'm no engineer). His system is far more efficient. The Wood burn in trying to keep the water barrel boiling would be too high. We did a similar...

From what I understood he was saying have the pipes running through a tank full of boiling water. Rather than having the pipes heated directly by the fire. However as I said the heat transfer would be too inefficient. You would hardly heat the bath water. Blacky

Your heat transfer efficency wouldn't be high enough. You would struggle to get the bath water up to 20degs. Though we have done a similar thing with a hot pot. Basically recycled water through a large boiling pot. Again it's hard to get the temp right, and is no where near as efficient as...