CLEAN, EFFICIENT WOOD HEATING
There's nothing quite like winter in Australia, when it's cold outside and you can hear the sound of rain on your roof. Australians have been warming their homes with wood heaters and slow combustion stoves for generations, basking in the golden glow of a real fire. But there's a problem - the old slow-combustion heater designs are inefficient and somewhat polluting, particularly when the damper is almost closed. With the damper closed, oxygen supply to the fire is restricted, resulting in unwanted smoke.
Tested by HRL Labs in Victoria, the Eco-Twin Wood Heater has an incredible maximum efficiency of 81.6%. There are only 6 other hardwood burning Wood Heaters on the market with an efficiency in this range. Efficiency is very important in wood heating, determining how much firewood you'll consume to heat your home. The Eco-Twin will consume as little as 1kg of hardwood per hour, heating an area of 200m², or 20 squares. That's 90% of the average Australian home!
Efficiency is important, but more important is the amount of particulate emissions put into the atmosphere for every kilogram of firewood that's consumed. The higher the emissions, the worse the heater is for air that all of us have to breathe. Most wood heaters on the market today have emissions of 1.8 grams of fine particulates per kilogram (g/kg) of firewood burnt, including the six wood heaters with an efficiency comparable to the Eco-Twin. This is where the Eco-Twin is remarkably different.
Under testing by HRL Labs, the Eco-Twin Wood Heater recorded minimum emissions of 0.13 grams per kilogram of firewood.
THAT'S 93% LESS THAN AVERAGE. We cannot understate this - the Eco-Twin has the LOWEST EMISSIONS OF ANY WOOD HEATER ON THE MARKET. The next closest has an emissions rate of 0.21g/kg, but an efficiency of 66%.
How can the Eco-Twin have such low emissions, and such high efficiency? Simply put, it's completely different to any other Wood Heater currently available. When wood burns, it releases a mixture of smoke and flammable gasses. In a typical wood heater, this smoke and gas passes unburnt up the flue and into the atmosphere, lost forever. Not so in the Eco-Twin.
Initially the Eco-Twin operates just like most Wood Heaters you've come across. Wood is burnt in the upper chamber, with the smoke and hot gasses escaping through an adjustable outlet at the rear. Once the flue heats up it starts to draw, actively pulling the smoke and gasses from the upper chamber. At this point we close the outlet at the rear of the upper chamber, and the flue starts to draw from the lower chamber through vents in the sides, pulling the smoke and gasses down, through a special refractory injector. This injector mixes fresh, superheated air into the flow and forms a jet of flame in the lower chamber, burning the smoke and gasses completely. This is a process called gassification - the wood is converted into gas into the upper chamber, mixed with preheated oxygen-rich air in the injector, and burnt in the lower chamber.
It gets better - rather than a fan controlled by a knob on the side of unit as you'll find in most Wood Heaters, the Eco-Twin controls the fan speed for you. Just switch the fan on and walk away, temperature sensors will determine whether to run the fan at low, medium or high speed. If the Eco-Twin is running hot, the fan will automatically run at the highest speed, and vice-versa.