[Stoves] Black radiating surfaces

[Alex and Christine English]

Andrew,
Or perhaps a single pipe distribution for a low pressure steam boiler, 
with gravity condesate  return counter flowing under the steam. 
Alex
> the maximum sunlight. Often there will have been be a coal fired 
> boiler set below ground level under the green house to provide 
> hydronic heating for it and the beds. From what I have seen the 
> pipes were >3" (>75mm) diameter.
> 
> AJH
> 
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