Cob Hot water pipes in cob walls?

[mpayson at eskimo.com]

I'm curious... It seems that an easy way to distribute heat throughout a cob
house would be to run metal water pipes through the walls, & centrally heat
the water in a fireplace. Obviously, there are logistical things to be
considered, but in general, would this work? You'd need a lot of pipe, but
my main concern would be that the pipe would expand when heated, possibly
cracking the wall...

I'm just curious if anyone has tried this or anything like it?

Thanks!
Mike
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