JR> What we see a lot of here, is water jackets for combustion heaters
 JR> that are plumbed to augment the hot water services. Though these
 JR> aren't without danger. A local family forgot to open the water valve
 JR> and the water in the pipe in the firebox superheated and blew up the
 JR> combustion heated. Unfortunately their kids were sitting near it at
 JR> the time. The amusing aspect is the kids now sport tee shirts
 JR> labeling them as "Blown up Kid#1" & "Blown up Kid #2"
Seems to me this problem could be averted by the use of a pressure-relief 
valve, just like a commercial boiler.  Some people tend to forget how 
dangerous it can be to heat water in an enclosed space!
KLC
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