How much firewood does a rocket stove save?

SGE Fabs rocket stoves save 40 to 60 percent firewood compared to traditional open-fire stoves. The exact savings depend on the type of wood, moisture content and cooking volume.

How quickly does a rocket stove pay for itself?

For a hotel or catering business, an SGE Fabs rocket stove typically pays for itself within 4 to 8 weeks through firewood savings alone. For household use, the payback period is 2 to 3 months.

What type of firewood works best in a rocket stove?

Dry, seasoned hardwood gives the best results. However, SGE Fabs rocket stoves also work well with coconut shells, dried palm fronds, wood scraps and other biomass. The key is low moisture content.

How Rocket Stoves Save Firewood and Fuel Costs

The single biggest reason people switch to a rocket stove is fuel savings. Not the idea of saving fuel in theory, but the actual, measurable drop in how much firewood they buy and burn every week. We have tracked this with our customers at SGE Fabs and the numbers are consistent across different types of users.

The Science Behind the Savings

A traditional open-fire stove has no insulation and no airflow control. Heat escapes in every direction. Wood burns incompletely, leaving behind charcoal and unburnt gases. You end up with a lot of smoke and not a lot of cooking heat.

A rocket stove solves this with three design elements: an insulated combustion chamber that keeps heat where it is needed, controlled air intake that feeds oxygen to the fire at the right rate, and a vertical burn tunnel that directs heat straight into the cooking vessel. The wood burns at much higher temperatures, which means more complete combustion and more heat extracted per kilogram of wood.

Real Numbers from Real Customers

Here is what we have documented from customers across different use cases:

Small hotel in Coimbatore (50 meals per day)

Before rocket stove: 15 kg firewood per day, Rs 2,700 per month
After rocket stove: 6 kg firewood per day, Rs 1,080 per month
Monthly savings: Rs 1,620 (60% reduction)
Stove cost recovered in: 4 weeks

Catering business in Salem (300-person events)

Before: 80 to 100 kg firewood per event
After: 35 to 45 kg firewood per event
Savings per event: Rs 600 to Rs 800
With 8 events per month, monthly savings: Rs 5,000 to Rs 6,400

Household in rural Erode (family of 5)

Before: 4 to 5 kg firewood per day with traditional stove
After: 1.5 to 2 kg firewood per day with SGE 5 kg rocket stove
Monthly savings: about Rs 600
Stove cost (Rs 2,750) recovered in: about 5 weeks

Why the Savings Are So Significant

The savings are not marginal. They are 40 to 60 percent. This is because a traditional stove wastes wood in three ways that a rocket stove eliminates:

Incomplete combustion: Traditional stoves leave behind charcoal and half-burnt wood. A rocket stove burns wood nearly completely.
Heat loss: Open fires radiate heat in all directions. A rocket stove directs heat upward into the pot.
Excess air: Too much air cools the fire. A rocket stove controls airflow for optimal combustion temperature.

Additional Savings: Time and Health

Beyond firewood costs, there are savings that do not show up on a receipt. Cooking is faster because heat is more concentrated, so you spend less time in front of the stove. Smoke is dramatically reduced, which means fewer health issues for the cook and lower cleaning costs for the kitchen. Soot buildup on walls and ceilings drops significantly.

Choosing the Right Fuel

Our stoves work with almost any dry biomass, but some fuels give better results:

Best: Dried hardwood (neem, casuarina, eucalyptus), coconut shells
Good: Dried palm fronds, wood offcuts from carpentry shops
Avoid: Green or wet wood (produces excess smoke and reduces efficiency)

The key is moisture content. Wood that has been dried for a few weeks burns cleanly and efficiently. Fresh-cut wood has too much water content and will produce smoke even in a rocket stove.