Peć za keramiku je vruća.

Peć is the dictionary form, meaning oven, stove, kiln, furnace depending on context. In this sentence, it means kiln.

It is a feminine noun, even though it does not end in -a. That is important because the adjective later must agree with it:

• peć = feminine singular
• so: vruća = feminine singular adjective form

A lot of Croatian feminine nouns do end in -a, but some feminine nouns end in a consonant, and peć is one of them.

Because the preposition za here means for, and in this meaning it usually requires the accusative case.

So:

• dictionary form: keramika
• accusative singular: keramiku

That is why you get:

• peć za keramiku = a kiln for ceramics / a ceramic kiln

This is a very common pattern in Croatian:

• šalica za kavu = cup for coffee
• četka za kosu = brush for hair
• peć za keramiku = kiln for ceramics

Je is the 3rd person singular present tense of the verb biti (to be).

So here it simply means is:

• Peć za keramiku je vruća.
• The kiln is hot.

It links the subject (Peć za keramiku) with the description (vruća).

Because adjectives in Croatian must agree with the noun they describe in gender, number, and case.

Here the noun is:

• peć = feminine
• singular
• nominative

So the adjective must also be:

• feminine singular nominative → vruća

Compare:

• vruć = masculine singular
• vruća = feminine singular
• vruće = neuter singular

Examples:

• kruh je vruć = the bread is hot
• peć je vruća = the kiln is hot
• sunce je vruće = the sun is hot

The letter ć is a soft sound, somewhat like a very soft ch/t sound. For an English speaker, it is often approximated as something between t and ch, but softer than English ch in chair.

Rough pronunciation:

• peć ≈ pech (but softer)
• vruća ≈ VROO-cha (again, with a softer ć)

Also note:

• č and ć are different letters in Croatian
• English speakers often confuse them at first

You do not need a perfect pronunciation immediately, but it is good to notice that ć is not the same as plain c.

Yes. Both are possible, but they are formed differently.

• peć za keramiku = literally kiln for ceramics
• keramička peć = literally ceramic kiln

Both can refer to the same kind of object. The za + accusative structure is very common when Croatian describes what something is used for. It can sound practical and straightforward.

So:

• peć za keramiku emphasizes what it is for
• keramička peć uses an adjective and can sound a bit more like a fixed label or category

Croatian word order is more flexible than English word order, because case endings show grammatical relationships.

The neutral, natural order here is:

• Peć za keramiku je vruća.

But other orders are possible for emphasis, for example:

• Vruća je peć za keramiku.
• Peć za keramiku vruća je.

These are more marked or stylistic. For a learner, the safest choice is the normal order:

• subject + je + adjective

So stick with Peć za keramiku je vruća unless you have a reason to emphasize something.

Normally, in standard Croatian, no: you usually keep je in this kind of present-tense sentence.

So you say:

• Peć za keramiku je vruća.

not usually:

• Peć za keramiku vruća.

Croatian normally uses the present tense of biti (to be) in ordinary statements like this. Leaving it out would sound incomplete in standard speech, though you might occasionally see omission in poetry, headlines, or very informal styles.

Usually vruća means hot, not just mildly warm.

If you wanted warm, Croatian often uses topla:

• vruća peć = a hot kiln
• topla peć = a warm kiln

So in your sentence, vruća suggests real heat, not just a pleasant temperature.

It is capitalized only because it is the first word of the sentence.

In normal writing, peć is not a proper noun, so it would not normally be capitalized in the middle of a sentence:

• Peć za keramiku je vruća.
• Ta peć za keramiku je nova.

So the capital letter here is just standard sentence capitalization.