Ne treba podgrijavati kavu; skuhat ćemo novu.

Yes — Ne treba + infinitive is a very common impersonal way to say:

• it is not necessary to ...
• there is no need to ...
• sometimes, depending on context, one shouldn’t ...

So Ne treba podgrijavati kavu most naturally means There’s no need to reheat the coffee.

Croatian often uses this impersonal structure where English might use you don’t need to.

This is about aspect.

• podgrijavati = imperfective
• podgrijati = perfective

In Ne treba podgrijavati kavu, the imperfective infinitive is natural because it refers to the action in a general sense: there is no need to be reheating / to reheat coffee.

After verbs and expressions like treba, morati, voljeti, početi, Croatian often uses the infinitive in a way where the imperfective can sound more neutral or process-focused.

A perfective form Ne treba podgrijati kavu would sound less natural in this context.

Podgrijavati means to reheat or to warm up again.

It comes from:

• grijati = to heat
• podgrijati / podgrijavati = to reheat, warm up

So podgrijavati kavu = to reheat the coffee.

Because kava is the direct object of the verb, so it goes into the accusative case.

• nominative: kava = coffee
• accusative: kavu

So:

• Kava je hladna. = The coffee is cold.
• Podgrijavati kavu = to reheat the coffee

This is very normal for feminine nouns ending in -a:

• voda → vodu
• juha → juhu
• kava → kavu

Skuphat ćemo is the future tense of skuhati.

It is formed with:

• the infinitive stem of the main verb
• • forms of htjeti used as future auxiliaries

So:

• skuhat ćemo = we will make / cook / brew

This means we’ll make a new one.

In standard writing, the auxiliary is written separately:

• skuhat ćemo

Compare:

• ja ću skuhati
• mi ćemo skuhati
• colloquially/written with clitic placement after a dropped final -i: skuhat ćemo

This shortened form is very common and standard.

Yes, literally skuhati means to cook or to boil, but in Croatian it is also the normal verb for making certain hot drinks or foods.

So with coffee, skuhati kavu means:

• to make coffee
• to brew coffee
• sometimes literally to boil/prep coffee, depending on the type

This is a very natural Croatian expression.

Because novu stands for novu kavu.

Croatian often omits a noun when it is obvious from context, just like English says:

• We’ll make a new one

Here:

• novu = new in the feminine accusative singular
• it agrees with the omitted noun kavu

So the full version would be:

• skuhat ćemo novu kavu

But saying just novu is completely natural.

Because it agrees with the omitted noun kavu.

• kava is feminine singular
• as a direct object, it is accusative singular: kavu
• the adjective must match it

So:

• nominative: nova kava
• accusative: novu kavu

Even when kavu is omitted, the adjective still stays in the correct form:

• skuhat ćemo novu

The semicolon connects two closely related ideas:

• Ne treba podgrijavati kavu
• skuhat ćemo novu

The meaning is basically:

• No need to reheat the coffee; we’ll make a new one.

A comma or a full stop could also appear in some contexts, but the semicolon neatly shows that the second clause explains the first.

Yes, that is possible, but the meaning shifts slightly.

• Ne treba podgrijavati kavu = impersonal, There’s no need to reheat the coffee
• Ne trebamo podgrijavati kavu = personal, We don’t need to reheat the coffee

The original sentence sounds a bit more general and natural in this context.

The given word order is very natural:

• Ne treba podgrijavati kavu; skuhat ćemo novu.

Croatian word order is flexible, but this version sounds neutral and idiomatic.

You could also say:

• Kavu ne treba podgrijavati; skuhat ćemo novu.

This puts extra emphasis on kavu.

So the original is the most straightforward version, while other orders may add emphasis or contrast.