I was told about this yesterday, so I read the article in September/October 2011 Living Woods Magazine. There are several points: I think "Par-Char" just happens to be a catchy name. The article says the wood is dried without burning, to 10%mc. This takes fuel in another stove called a Greig's Rocket, more investment. As it burns fuel, the efficiency is reduced over what is claimed, since I can't find anywhere that the drying fuel is accounted for. If the wood is dried to 10%, it will be much easier to light. I don't like that. Getting burnt is unpleasant, and increasing the risk of a fire is not something I do deliberately, particularly with a fuel that is usually assumed to be no hazard.
I would dry wood in the normal way by stacking and leaving it for a year i the case of ash, and two years i the case of anything else. If I wanted to accelerate the drying, I'd have a polytunnel. Somewhere light and dry to store it and to work in, and not very expensive for a diy version.
When TSHTF, if someone can't be bothered to put some effort into getting fuel supplies, all well and good, that may mean I could have some. If they want to throw a switch for instant heat, tough.
You need a fire going under the Grieg's rocket for 10 hours, that's going to be a fair amount of fuel to dry some firewood, when buying it in March and stacking it to use in October could have used no fuel. Ok , oak would be a bad choice, but ash is fine. People with modern small plots, would have a problem, they had better get together with neighbours and share a house as well as a bath. There may well be tough choices to make, so they had better be prepared. More clothes too.
This exercise is similar to the charcoal attempts in the 1990s. That failed as there was a recession at the time because of spending cuts at the end of the cold war, and we were competing against cheap foreign imports. At the time you didn't need a licence for a chainsaw, just a certificate would do. Now the safety overheads are too great, and firewood is a more efficient product, so someone has found a £6000 overhead in the form of a dryer which isn't needed.
I'll have another glass of snake oil if there's any left.........