> CH>The 93% is the electricity + heat produced by the natural gas 
 > unit.
 > CH>Diesel's about 90%.  I expect to speak with the fellow from R. A.
 > CH>Mitchell today, so will confirm those figures...
 > 
 > The 90% is probably close enough. If you recapture the heat from
 > the exhaust and block, you can increase the figure to almost 99%.
 > But, the risks with exhaust recapture seems not worth being too
 > stingy. [grin]
A water-cooled manifold makes it safe, and I think that's how they do it.
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