Burning Box (Solid)

Burning Boxes are a set of machine blocks in GregTech 6. They convert solid fuels into Heat that can be used to power other devices. At present, these heat-powered devices are the Steam Boiler Tank and the Crucible.

Usage
The Burning Box has no GUI. To insert Fuel, right-click the box while holding items of solid fuel. The entire stack of fuels will be added at once. Additionally, the Burning Box does not automatically light when it receives fuel. To light it, use a Flint and Tinder on it. Fuel burned by a Burning Box may produce Ashes, depending on the fuel. Ash must be periodically removed, which can be done by right-clicking the Box with an empty hand. The Burning Box requires an open space (or a block without a collision box) in front of it to operate. An active Burning Box will cause nearby flammable objects to randomly catch fire, so be careful.

The Burning Box emits heat from its top side. Devices placed on its top side will automatically absorb all of the heat the Box produces. If there is no device on top of the Box, the Box will lose half of the heat it produces and store the rest for when a device is placed.

Burning Boxes can be crafted out of many different materials. Their fuel efficiency and heat transfer rate is determined by the material used. Burning Boxes also come in two variants: normal and Dense. Dense Burning Boxes are significantly more expensive, but burn fuel and transfer heat at 4x the rate of normal Burning Boxes, at no change in fuel efficiency. However, crafting a Dense Burning Box requires a Dense Copper Plate, which can only crafted in a Compressor.

Fuel burn rate is also determined by the material of the box. One smelting operation is equal to 5,000 GregTech Heat Units; one Coal equals 40,000 HU. At least one exception to this rule is wood: 2500 HU / unit of wood (log is 8 units, plank is 1 unit, stick is 0.5 units).

Automation
Solid burning box can be automated with hoppers. For example: hopper with fuel attached to a side or back and another hopper (for ash removal) attached to the bottom.

Non-solid fuels
For liquid fuels (diesel, ethanol, oil, rocket fuel, fire water, GregTech alcoholic drinks, etc) use liquid burning boxes. For gas fuels (IC2 biogas, hydrogen, methane, etc) use gas burning box. Both accept fuel by pipes and create no ash currently.

Wood log is 8 units of wood, wood plank is 1 unit of wood. Testing shows that it's 2500 HU / wood unit. So it's better to burn entire logs instead of planks, made from them. Also, charcoal is only 2 times better than wood log and requires coke oven.