Krom la kuirejo, ĉiu ĉambro havas hejtadon.

Krom means apart from, except for, or besides, depending on context.

In this sentence, it marks an exception:

• Krom la kuirejo = apart from the kitchen / except for the kitchen

So the sentence says that all the rooms have heating, with the kitchen being the exception.

La means the.

Here, la kuirejo refers to a specific kitchen: the kitchen of the house, apartment, or place being discussed. In Esperanto, that is normally expressed with la.

So:

• la kuirejo = the kitchen

Without la, kuirejo would sound more like a kitchen or kitchen in a more general sense.

Because la kuirejo is part of the prepositional phrase with krom, not the direct object of the verb.

In Esperanto:

• direct objects take -n
• nouns after prepositions normally do not take -n unless there is a special reason

Here:

• Krom la kuirejo = prepositional phrase
• hejtadon = direct object of havas

So:

• krom la kuirejo → no -n
• havas hejtadon → yes, -n

Both can refer to all the rooms, but they are structured differently:

• ĉiu ĉambro = each room / every room
• ĉiuj ĉambroj = all rooms

In Esperanto, ĉiu is singular, so the noun after it is also singular:

• ĉiu ĉambro havas... = each room has...

This is very common and natural.

Because ĉiu already works as a determiner meaning each or every, so adding la would be unnecessary and ungrammatical here.

So Esperanto says:

• ĉiu ĉambro = every room

not:

• la ĉiu ĉambro

This is similar to English, where we say every room, not the every room.

Because Esperanto often uses a singular noun after ĉiu.

So:

• ĉiu ĉambro literally looks like each room
• but in meaning it refers to all the rooms one by one

English does the same:

• Every room has heating
• not Every rooms have heating

So the singular is exactly what you should expect here.

Because hejtadon is the direct object of havas.

• havi = to have
• What does each room have? → hejtadon

In Esperanto, direct objects take -n:

• ĉambro havas hejtadon = a room has heating

So the -n marks hejtadon as the thing being had.

Hejtado comes from the verb hejti = to heat.

The ending -ado often gives the idea of an ongoing process, activity, or system. So hejtado means:

• heating
• a heating system
• heat provided to a room/building

In this sentence, it means the room has heating available, not just that someone is heating it at this exact moment.

Sometimes, but hejtado is more natural here.

A rough difference is:

• hejto = heat, heating, the act/result in a more general or less process-focused way
• hejtado = heating as a process or system

In a sentence about whether rooms are equipped with heating, hejtado sounds very suitable.

Because the grammatical subject is ĉiu ĉambro, and that is singular.

Even though the overall meaning includes many rooms, Esperanto treats ĉiu ĉambro as each room, which is singular. So the verb must also be singular:

• ĉiu ĉambro havas
• not ĉiu ĉambro havas with any different plural form, since Esperanto verbs do not change for number anyway

Also note: Esperanto verbs do not agree with singular/plural the way English verbs sometimes do. Havas is the present tense form for all persons and numbers.

Examples:

• mi havas
• li havas
• ili havas

Always havas.

Yes. That is also correct and may even feel clearer to some learners.

Both are natural:

• Krom la kuirejo, ĉiu ĉambro havas hejtadon.
• Ĉiu ĉambro, krom la kuirejo, havas hejtadon.

The meaning is the same. The first version emphasizes the exception first; the second starts with the main subject.

Not always. Krom can mean either:

• except for / apart from
• in addition to / besides

The context tells you which meaning is intended.

Examples:

• Krom la kuirejo, ĉiu ĉambro havas hejtadon.
  = Except for the kitchen...

• Krom la kuirejo, la domo havas ankaŭ balkonon.
  = Besides the kitchen, the house also has a balcony.

In your sentence, the meaning is clearly except for.

Kuirejo can be broken down like this:

• kuir- = cook
• -ej- = place for
• -o = noun ending

So kuirejo literally means a place for cooking, i.e. kitchen.

This is a very useful Esperanto pattern:

• lerni = to learn → lernejo = school
• dormi = to sleep → dormejo = dormitory / sleeping place
• kuiri = to cook → kuirejo = kitchen

It is standard and helpful here.

The phrase Krom la kuirejo is an introductory phrase, and the comma shows where the main clause begins:

• Krom la kuirejo, ĉiu ĉambro havas hejtadon.

You may sometimes see punctuation vary a little in Esperanto, but this comma is a good, normal choice and makes the sentence easier to read.

In everyday usage, ĉambro usually means a room in a home or building, but whether a kitchen is counted as one of the ĉambroj can depend on context.

Because of that, the speaker explicitly says:

• Krom la kuirejo = except for the kitchen

This removes any doubt. Whatever counts as a room here, the kitchen is not included among the ones that have heating.