La hejtado bone funkcias hodiaŭ.

La is the definite article, meaning the.

So la hejtado means the heating. In a sentence like this, Esperanto often uses la when talking about a specific thing that both speaker and listener can identify, such as the heating system in the house, building, or room.

Without la, hejtado would be more like heating in a general sense.

The ending -ado often shows an ongoing action, repeated action, or the process/activity itself.

• hejti = to heat
• hejtado = heating, the process/system of heating

In practice, hejtado is commonly used for heating as a system or service, like central heating.

So here la hejtado is naturally understood as the heating.

In Esperanto, all present-tense verbs end in -as.

• funkcii = to function, to work
• funkcias = functions / is functioning / works / is working

So bone funkcias means works well or is functioning well.

A useful point: Esperanto verbs do not change for person.

• mi funkcias = I work / am working
• vi funkcias = you work / are working
• ĝi funkcias = it works / is working

The verb form stays the same.

Because bone is an adverb, and it modifies the verb funkcias.

• bona = good, an adjective
• bone = well, an adverb

In English, we say The heating works well, not The heating works good in standard grammar. Esperanto works the same way here.

So:

• La hejtado estas bona = The heating is good
• La hejtado bone funkcias = The heating works well

Because there is no direct object here.

The sentence has:

• La hejtado = the subject
• bone funkcias = the verb phrase
• hodiaŭ = a time adverb

The verb funkcii does not take a direct object in this sentence. The heating is not doing something to another noun; it is simply functioning.

So no word needs -n here.

Hodiaŭ means today and acts as a time adverb.

It tells you when the heating works well.

So the sentence structure is basically:

• La hejtado = subject
• bone funkcias = works well
• hodiaŭ = today

Esperanto is flexible, so you could also say:

• Hodiaŭ la hejtado bone funkcias.
• La hejtado hodiaŭ bone funkcias.

All of these are grammatical. The original sentence is a neutral, natural order.

Yes. Funkcii is the usual verb for something functioning or operating properly.

It is especially natural for:

• machines
• devices
• systems
• services

So for heating, plumbing, a computer, an elevator, etc., funkcii is a very good choice.

Examples:

• La komputilo ne funkcias. = The computer is not working.
• La lifto bone funkcias. = The elevator works well.

The core meaning of funkcias can cover both works and is working, because Esperanto does not distinguish simple present and present progressive the way English often does.

So depending on context, La hejtado funkcias hodiaŭ could mean:

• The heating works today.
• The heating is working today.

But because this sentence has bone, the strongest sense is:

• The heating is working well today.
• The heating works well today.

Because the main verb is funkcias.

In English, some meanings use to be + -ing, like is working. Esperanto usually just uses the plain present tense:

• funkcias = works / is working

You only use estas when to be itself is the main verb, such as:

• La hejtado estas bona. = The heating is good.

But here the main idea is functions, so funkcias is enough.

A helpful pronunciation guide is roughly:

ho-di-aŭ

Each vowel is pronounced clearly:

• ho
• di
• aŭ

The aŭ is a diphthong, roughly like ow in English cow, though pronunciation varies a bit depending on accent.

Also remember that Esperanto stress is always on the second-to-last syllable. In hodiaŭ, the stress falls on di:

ho-DI-aŭ

Yes, absolutely.

Both of these are fine:

• La hejtado bone funkcias hodiaŭ.
• La hejtado funkcias bone hodiaŭ.

Esperanto word order is fairly flexible, especially with adverbs like bone and hodiaŭ.

The difference is mostly about emphasis and style, not grammar:

• bone funkcias slightly highlights works well as a unit
• funkcias bone is also very natural and common

It can suggest either, depending on context.

Literally, hejtado comes from the idea of heating as a process or activity. But in everyday use, it is also commonly used for the heating as a household or building system.

So in this sentence, most people will understand it as:

• the heating system
• the heating service in the building
• the house heating

This is similar to English, where the heating can mean the system, not just the abstract process.

Yes, it is very natural.

It uses:

• a normal noun phrase: la hejtado
• a common adverb: bone
• a standard present-tense verb: funkcias
• a time expression: hodiaŭ

So it sounds like ordinary, idiomatic Esperanto for saying that the heating is functioning well today.