Translation guide
A furnace is a device used for heating, often to high temperatures, in homes or industrial settings. Japanese distinguishes between home heating furnaces, industrial/metalworking furnaces, and metaphorical uses.
A device that heats air and distributes it through ducts in a house or building.
General term for a heating furnace, commonly used for central heating systems.
You need to replace the furnace filter.
Can refer to a furnace or heater, but is broad and often used in compound words. In context, it can mean a home furnace.
There is a furnace in the basement.
Loanword from English, used in technical or product contexts, but not common in everyday speech.
This furnace is high-efficiency.
A high-temperature enclosed structure for melting metals, firing ceramics, or industrial processes.
The standard term for industrial furnaces, kilns, or ovens. Often used in compounds like 溶鉱炉 (blast furnace).
They use a furnace to melt iron.
Specifically a blast furnace for smelting iron.
A firing furnace or kiln, used for ceramics or heat treatment.
Pottery is fired in a kiln.
Used figuratively to describe a very hot environment or a severe test.
The English word 'furnace' is not used for a kitchen oven. For a cooking oven, use オーブン (ōbun). 炉 (ro) can sometimes refer to a traditional Japanese hearth or a kiln, so context is important.
The temperature of the blast furnace is extremely high.