Hi my new polytunnel will be 20 meters from our house/ woodburner. I'd like to use some of it's heat to warm the tunnel.
The obvious one would be to put a spur off the radiator system and put a radiator in the IBC i'm using as a heatstore. However this has the potential to freeze/ crack.
So I was wondering about a 12cm diameter
Insulated pipe dug into the ground with a computer fan at both ends (one sucking, one blowing)
Do you think the heat would stay in the pipe well enough to be worth doing? Or should I think about water some more?