teppan ha atui.

は marks 鉄板 as the topic of the sentence.

So 鉄板は熱い is not literally word-for-word iron plate + is + hot. It is more like:

• As for the iron plate, it is hot
• The iron plate is hot

In natural English, we usually just say The iron plate is hot, but the Japanese particle は is doing a topic-marking job that English does not mark so clearly.

When は is used as a particle, it is pronounced wa. This is a special historical spelling rule in Japanese.

So in this sentence:

• written: 鉄板は熱い
• spoken: てっぱんはあつい in kana spelling, but pronounced teppan wa atsui

The same thing happens with some other particles too, such as:

• へ written, but often pronounced e as a particle
• を written, but pronounced o

Because Japanese does not always need a separate verb like is in this kind of sentence.

熱い is an i-adjective, and i-adjectives can function as the predicate by themselves. That means they can end the sentence without needing a word like is.

So:

• 鉄板は熱い。 = The iron plate is hot.

You do not need だ or です to make it grammatical.

Compare:

• 鉄板は熱い。 = plain
• 鉄板は熱いです。 = polite

Both are correct.

Japanese sentences often place the main predicate at the end. In this sentence, the predicate is 熱い.

So the structure is:

• 鉄板 = iron plate
• は = topic marker
• 熱い = is hot / hot

This is very normal Japanese word order. English tends to put the adjective after is, but Japanese puts the predicate at the end.

熱い is an i-adjective.

That means:

• it ends in い
• it can directly describe a noun
• it can also end a sentence as the predicate

Examples:

• 熱い鉄板 = a hot iron plate
• 鉄板は熱い = the iron plate is hot

This is different from a na-adjective, which would need だ or です when used as the predicate.

This is a very common question because several Japanese words are pronounced atsui.

• 熱い = hot to the touch, or physically hot like a pan, soup, metal plate
• 暑い = hot weather, hot air, a hot day
• 厚い = thick

So here 鉄板は熱い uses 熱い because a metal plate is something that becomes physically hot.

For example:

• 今日は暑い。 = It’s hot today.
• スープが熱い。 = The soup is hot.
• この本は厚い。 = This book is thick.

Yes, you could say 鉄板が熱い, but the nuance changes.

• 鉄板は熱い。 = As for the iron plate, it’s hot.
• 鉄板が熱い。 = The iron plate is the one that is hot / more focus on 鉄板

Very roughly:

• は introduces or contrasts a topic
• が often gives stronger focus to the subject

In many everyday situations, both can be grammatical, but they do not always feel exactly the same.

Yes, 鉄板 is a compound noun, read てっぱん.

It is made of:

• 鉄 = iron
• 板 = plate / board

Together, 鉄板 means an iron plate or metal plate, depending on context.

A learner may notice that てつ + はん does not stay てつはん. In compounds, sounds often change, and here it becomes てっぱん. This kind of change is common in Japanese.

Normally, Japanese is written without spaces:

• 鉄板は熱い。

Spaces are often added in textbooks or beginner materials to make the parts easier to see.

So the version with spaces is just a learning aid, not standard Japanese writing.

鉄板は熱い。 is plain style.

A polite version is:

• 鉄板は熱いです。

The meaning is basically the same, but the level of politeness changes.

Use:

• 熱い。 in casual speech, notes, simple statements
• 熱いです。 in polite conversation

Yes, very often.

If everyone already knows you are talking about the iron plate, Japanese might simply say:

• 熱い。 = It’s hot.

Japanese frequently omits information that is clear from context. English usually keeps the subject more often, but Japanese does not need to.

So 鉄板は熱い is a full, clear sentence, but in real conversation a shorter version may be more natural if the context is obvious.