Vedenkeitin kiehauttaa veden nopeasti, joten teen teetä sillä joka ilta.

Vedenkeitin is a compound noun:

• veden = water's / of water (from vesi, water)
• keitin = boiler, cooker, device for boiling (related to keittää, to boil / cook)

So the word literally means something like water-boiler, and in normal English that is a kettle or more specifically an electric kettle.

Finnish uses compound words very freely, so long words like this are very common.

They look the same, but they are not functioning in exactly the same way.

1. In vedenkeitin, veden- is part of a compound word:

   • vesi → veden
   • It helps describe what kind of device it is: a device for water

2. In kiehauttaa veden, veden is the object of the verb:

   • the kettle brings the water to a boil

So both forms come from vesi, but one is inside a compound noun and the other is the object of the sentence.

This is about the Finnish object system.

• veden is a total object
• vettä is a partial object in the partitive

Here, kiehauttaa veden suggests a completed action: the kettle brings the whole amount of water to a boil.

So:

• kiehauttaa veden = boil the water / bring the water to a boil completely
• kiehauttaa vettä = boil some water, or boil water in a more ongoing / less bounded sense

Because the sentence presents this as a completed, effective action, veden is natural.

They are related, but not identical.

• keittää = to boil, cook, brew
• kiehauttaa = to bring to a boil, often with the idea of doing it quickly or causing it to start boiling

So:

• keittää vettä = to boil water
• kiehauttaa veden = to bring the water to a boil

In this sentence, kiehauttaa fits well because an electric kettle's job is specifically to get the water boiling quickly.

Teetä is the partitive of tee.

Finnish often uses the partitive for substances, uncountable things, or actions that are not focused on as a single completed object. Tea is being treated here as a substance: some tea.

So:

• teen teetä = I make tea
• teen teen = I make the tea

The second one is possible in a specific context, but it sounds much more definite and specific, as if a particular tea has already been mentioned. In a general habit sentence like this, teen teetä is the normal choice.

Yes. Finnish often uses tehdä (to make / do) for preparing food and drink.

So teen teetä is perfectly normal and means I make tea.

You could also hear:

• keittää teetä = brew / boil tea

The difference is mostly about emphasis:

• tehdä teetä = prepare tea in a general sense
• keittää teetä = focus more on the brewing/boiling process

In this sentence, teen teetä sounds very natural.

Here sillä means with it or using it.

It is the adessive form of se (it / that):

• se → sillä

The adessive case often expresses means, instrument, or tool, so sillä can mean:

• with it
• by means of it
• using it

So teen teetä sillä means I make tea with it.

Yes, it can.

This is one reason learners often notice sillä.

Depending on context, sillä can mean:

• with it / on it / by it — as a case form of se
• for that reason / because — as a conjunction or connective word

In this sentence, it clearly means with it, because:

• the sentence already has joten, which means so / therefore
• sillä comes after teen teetä, where it naturally refers back to vedenkeitin

So here it is not a connector. It is an instrumental form meaning with it.

Joten is a conjunction meaning so, therefore, or thus.

It connects the two clauses:

• Vedenkeitin kiehauttaa veden nopeasti
• joten teen teetä sillä joka ilta

The first clause gives the reason or background, and the second gives the result or consequence.

So the structure is basically:

• X happens, so Y happens

Because the verb already shows the subject.

Teen is the first person singular form of tehdä, so it already means I do / I make.

Finnish usually leaves out subject pronouns when they are not needed:

• teen = I make
• sinä teet could be just teet = you make
• minä teen is possible, but minä is usually only added for emphasis, contrast, or clarity

So omitting minä here is completely normal.

Joka ilta literally means every evening:

• joka = every / each
• ilta = evening

This is a very common and natural way to express repeated time.

You can also say jokaisena iltana, which also means every evening, but it is a bit heavier and sometimes feels slightly more formal or emphatic.

So:

• joka ilta = the usual, simple way
• jokaisena iltana = also correct, but less compact

Finnish has no articles like English a/an or the.

So:

• vedenkeitin can mean a kettle or the kettle
• veden can mean water or the water
• teetä can mean tea or some tea

The exact meaning comes from context, not from articles.

That is why English speakers often feel that Finnish is leaving something out, but in Finnish this is completely normal.