A rocket mass heater claims to heat a home with one tenth the wood of a conventional wood stove. HOW is that possible? Let's start by looking at the label on conventional wood stove. This label is allowed to have 16 extra percentage points to compensate for some of the heat that goes up the chimney. So a wood stove that says it is 75% efficient, is actually 59% efficient.
Different testing facilities compete to measure the efficiency of a wood stove, so they work hard to produce numbers better than their competitors. Legitimately. They might use especially dry wood, or there could be a little extra air pressure in a test lab - things that could plausibly happen in an optimal home scenario. So the resulting numbers are higher than if their competitor had done the same test and yet still fall within a space of being legit.
But this means that most people using a 59% efficient wood stove will probably operate it at 20% efficiency on average. And most people putting a big green log on just before bed with dampers set low might be getting less than 3% efficiency. And when the fire is down to just embers, the stove might continue to pull heat out of the house, resulting in negative efficiency.
It is pretty easy for a rocket mass heater to compete with 3% efficiency. And even easier to compete with negative efficiency.
When using a conventional wood stove properly, the law requires an exit temperature of at least 350 degrees. 350 to 600 degrees is the most common. No matter how efficient the burn is, that's a LOT of heat going outside.
Rocket mass heaters typically test at 93% efficiency. That is without adding the 16% for going up the chimney. And the exhaust temperature tends to be 70 to 140 degrees. Since the mass holds the heat through the night after an efficient burn, people are not attempting to set up an inefficient burn through the night.
Most people shifting from conventional wood stoves to rocket mass heaters report heating their homes with one tenth the wood. Some people have shifted from modern, super efficient wood stoves that they were using very wisely - and those people report heating with 75% to 80% less wood.
Heat your home with one tenth the wood, one hundredth the smoke and wake up to a warm home.
Safer, cheaper, cleaner, easier and more luxuriant than a conventional wood stove.
Safer, cheaper, cleaner and better for the environment than natural gas or electric heat.
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