Hydrocarbons provide about 10-15 kWh/kg total bond energy - varies somewhat
with molecular chain length with short ones benefiting from the slightly
higher H to C ratio -  best is (probably) Methane =3D CH4 and candle wax,
being solid and rather non volatile at room temperature  will be somewhat
long chain. How much you get in practice deep-ends on the efficiency of
your burning process, but even at 100% efficiency a tea light would provide
perhaps 500 Watt-hours (based on out-of-head- estimate 50 grams of wax
/tealight - I being several thousand km from home with no readily available
tea's-light or weighing mechanisms to hand.) If you can get by on 2
kW.hr/day added heat energy and can get 100% conversion then 4 x tealights
may suffice. For most it wouldn't.


       Russell


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> http://www.telegraph.co.uk/finance/newsbysector/energy/10449357/Heat-your=
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> home-office-for-8p-a-day.html>
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