A vízforraló egy eszköz.

Here A is the definite article, so it means the.

• a = the before a consonant sound
• az = the before a vowel sound

So:

• a vízforraló = the kettle / the electric kettle
• az eszköz = the device would use az because eszköz starts with a vowel sound

In this sentence, A vízforraló egy eszköz literally means The kettle is a device.

Yes. egy can mean a / an.

So the sentence has:

• A vízforraló = the kettle
• egy eszköz = a device

That gives: The kettle is a device.

Hungarian often uses:

• a definite article for the subject: A vízforraló
• egy for an indefinite noun in the predicate: egy eszköz

They are two different words with two different jobs:

• a / az = the → definite article
• egy = a / an, and also literally one

Examples:

• a ház = the house
• egy ház = a house / one house

In your sentence:

• A vízforraló refers to a specific thing or to the kettle as a known item
• egy eszköz classifies it as one member of the group devices

Technically yes, because egy is also the number one, but in this sentence it is most naturally understood as the indefinite article: a.

So egy eszköz here means a device, not especially one device.

If you wanted to stress the number, you would usually say it with emphasis in speech or make the context clear.

Yes, you can, but it changes the feel a little.

• A vízforraló egy eszköz. = The kettle is a device.
• A vízforraló eszköz. = more like The kettle is a device/tool, sounding more categorical, definitional, or stylistically compressed

Hungarian often leaves out the article in predicate nouns in some contexts, especially with professions, roles, or classifications. But with a sentence like this, egy eszköz sounds very natural and clear for learners.

So:

• with egy = very straightforward, natural classification
• without egy = also possible, but a bit more bare or dictionary-like

Because Hungarian very often forms compound nouns as one word.

• víz = water
• forraló = boiler / thing that boils

So vízforraló literally means something like water-boiler, i.e. kettle or more specifically electric kettle depending on context.

This is very common in Hungarian. English sometimes writes similar ideas as one word, two words, or hyphenated words, but Hungarian strongly prefers solid compounds.

Usually yes, it refers to a kettle, especially an electric kettle.

Literal breakdown:

• víz = water
• forral = to boil
• -ó = a suffix that can help form a noun meaning something that does the action

So vízforraló is literally something that boils water.

In everyday use, this normally means a water kettle / electric kettle.

Eszköz means tool, device, or instrument, depending on context.

In this sentence, device is a very natural translation.

So egy eszköz means:

• a device
• sometimes a tool or an implement, in other contexts

It is a fairly general word.

This is the neutral, straightforward word order:

• A vízforraló = subject
• egy eszköz = predicate noun / classification

So the sentence simply states a fact: The kettle is a device.

Hungarian word order is flexible, but different orders change the emphasis.

For example:

• A vízforraló egy eszköz. = neutral statement
• Egy eszköz a vízforraló. = unusual in isolation; it puts focus on device

For a beginner, it is best to treat the original sentence as the normal basic order.

A rough pronunciation guide:

• vízforraló ≈ VEEZ-for-rah-loh
• eszköz ≈ ES-kuhz

A few useful notes:

• í is a long ee sound
• ó is a long o
• ö is like the vowel in German schön or French peu; English does not have a perfect match
• Hungarian stress is usually on the first syllable:
  • VÍZforraló
  • ESZköz

In Hungarian, accent marks are very important. They usually show a different vowel, often a longer one.

In this sentence:

• í in víz is a long vowel
• ó in forraló is a long vowel
• ö in eszköz is a different vowel from o
• ő would be the long version of ö, though it does not appear in this sentence

These marks are not optional spelling decorations. They are part of the word.

For example, changing vowel length can change the word.

Yes, but it is not written.

Hungarian often leaves out the present-tense is in the third person singular.

So:

• A vízforraló egy eszköz. literally looks like
• The kettle a device.

But the meaning is:

• The kettle is a device.

This is completely normal in Hungarian.

Compare:

• Én tanár vagyok. = I am a teacher.
• Te tanár vagy. = You are a teacher.
• Ő tanár. = He/She is a teacher.

In third person singular, the present-tense van is usually omitted in this kind of sentence.

Yes. For example:

• A vízforralók eszközök. = The kettles are devices.

Here:

• vízforraló → vízforralók = kettles
• eszköz → eszközök = devices

Notice that Hungarian makes both nouns plural when needed.

Also, just like in the singular, there is no written present-tense are in this kind of third-person sentence.

Hungarian chooses between a and az based on the sound that follows.

• a before a consonant sound
• az before a vowel sound

So:

• a vízforraló because vízforraló starts with v
• az eszköz because eszköz starts with e

This is similar to English a vs an, but in Hungarian it applies to the definite article instead of the indefinite one.