concrete boiler?

[kegjeg]

I am wondering if anyone has built or even seen a wood boiler out of concrete. I am not sure if the concrete could take the heat without cracking, maybe line the firebox with fire brick, or if I could get the heat transfer through the concrete to the water. I am just brainstorming on how to build a relatively inexpensive outdoor boiler. Any ideas?

 

[rx7145]

You might be able to use it to help insulate the water jacket. I don't think it work good though. The heat would crack it. Even with no heat it will still crack every time.

 

[blackdoggy]

What you need is to look for refractory brick or the mix for refractory cement, you wont be able to wrap a steel jacket with cement unless it's mix is meant for high heat and you use lots of rebar.