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The most efficient stoves are the Russian/Finnish masonry stoves with a typical over 80% use of available BTUs. Properly built, you can put your hand over the chimney and feel only a slight warmth escaping.

They burn very clean - but it depends on the wood and how dry it is. I lived through several harsh winters  with two these at each end of a large wooden house in the forest. They are economical with wood: we had a winter's worth stacked up outside under the eaves.

The easiest biodiesel is locally pressed oil from say rape seed. Your diesel engine will have to be slightly adapted, but it is not major mechanics. It's much easier to adapt an older diesel engine. An old Perkins in a boat would probably burn the stuff as it is.

The building research division of VTT the Finnish state technical research centre was been developing new timber construction techniques. One of these is massive  laminated load-bearing beams that have been used to span 20-30 metres.

You can't be me, I'm taken

by Sven Triloqvist on Thu May 22nd, 2008 at 06:28:13 PM EST
[ Parent ]
not these things?

the standard traditional heating in Polish homes, but they're generally coal fired

by MarekNYC on Thu May 22nd, 2008 at 06:42:22 PM EST
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Similar.  The point is the massive brick encasement to soak up and then radiate heat. And the somewhat convoluted flue path to expose as much surface area to rising heat, plus a method of closing off the flue when the fire has burned out to prevent cold air entering above.

You can't be me, I'm taken
by Sven Triloqvist on Fri May 23rd, 2008 at 04:22:25 AM EST
[ Parent ]

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