Crafting using Any Copper Plate, LV Wire Coil, Any Copper Plate, LV Wire Coil, Iron Sheetmetal, LV Wire Coil, Any Copper Plate, Any Redstone Dust and Any Copper Plate, arranged in the pattern shown. Produces External Heater.
Crafting 
External Heater guaranteed| source | count | chance | conditions |
|---|---|---|---|
| External Heater | 1–1 | 100% | Survives Explosion |
Crafting using Iron Sheetmetal, Iron Sheetmetal, Iron Sheetmetal, Iron Sheetmetal, Fluid Pipe and External Heater, arranged in the pattern shown. Produces Blast Furnace Preheater.
Crafting Blast Furnace Preheater guaranteedDrops itself when broken.
immersiveengineering:furnace_heaterimmersiveengineeringimmersiveengineeringchiselsandbits:blocks/chiselable/forced minecraft:blocks/mineable/pickaxe
Recipe JSON (1):
{
"recipe_type": "minecraft:crafting_shaped",
"pattern": [
"pwp",
"wsw",
"prp"
],
"ingredients": {
"p": {
"tag": "forge:plates/copper"
},
"r": {
"tag": "forge:dusts/redstone"
},
"s": {
"tag": "forge:sheetmetals/iron"
},
"w": {
"item": "immersiveengineering:wirecoil_copper"
}
},
"conditions": [],
"sequence": null,
"group_name": null,
"experience": null,
"cooking_time": null
}