Learn Hardcore Turkish: Şofben açılınca su hemen ısınıyor. - When the water heater turns on, the water heats up immediately.

It’s a domestic instant water heater (tankless), typically gas- or electric-powered, that heats water as it flows. A common near-synonym is termosifon (usually a storage-type heater). You’ll also see the nonstandard spelling şohben in informal writing, but şofben is the standard form.

Why is it açılınca and not açınca?

Because the heater isn’t the doer of the action; it’s being turned on. açıl- is the passive/inchoative form of aç-. So şofben açılınca means “when the heater is turned on.” If you said şofben açınca, it would wrongly suggest “when the heater opens (something),” or “when X opens (the heater),” which doesn’t match the grammar of the clause as written.

What does the suffix -ınca/-ince mean?

It forms a time clause meaning “when/once/whenever.” It attaches to a verb stem and obeys vowel harmony:

gelince = when (someone) comes
bitirince = when (someone) finishes
açılınca = when it is opened/turned on

How is açılınca built morphologically?

aç- = open/turn on
-ıl- = passive/inchoative (“be/get opened”)
-ınca = “when/once” (chosen by vowel harmony; last vowel is ı, so -ınca)

Who is the subject of each clause here?

In the subordinate clause, the subject is şofben (the heater): “when the heater is turned on.” In the main clause, the subject is su (the water): “the water heats up.”

Why is it ısınıyor with the -yor ending instead of ısınır?

Both are possible:

ısınır (aorist) states a general fact or tendency: “it (generally) heats up.”
ısınıyor (present progressive) highlights the immediate/regular outcome right after the trigger. It can still describe a habitual result in this kind of sentence. So the choice is nuance; either works.

What’s the difference between ısınmak and ısıtmak?

ısınmak is intransitive: “to get warm/heat up” (the subject warms up by itself). Example: Su ısınıyor.
ısıtmak is transitive: “to heat (something).” Example: Şofben suyu ısıtıyor. (The heater heats the water.)

What does hemen mean, and where does it go?

hemen means “immediately/right away.” It usually appears before the verb or right before what it modifies:

Su hemen ısınıyor. (Very natural.)
Hemen su ısınıyor. (Possible but sounds like topical emphasis on “immediately.” The first is more neutral here.) Synonyms include anında and derhal.

Is hemen hemen the same as hemen?

No. hemen hemen means “almost/nearly.” For example, Hemen hemen herkes geldi = “Almost everyone came.” In the sentence at hand, you want hemen (“immediately”), not hemen hemen.

Why is it su and not suyu?

Because su is the subject of the main clause and subjects are in the nominative (bare) form. suyu would be the accusative (definite object) or a possessed form (“its water”), which doesn’t fit here. Compare: Şofben suyu ısıtıyor (“The heater heats the water”)—here suyu is a definite object.

Can I say Şofben açıldığında su hemen ısınıyor instead of açılınca?

Yes. -dığında/-diğinde also means “when/at the time that,” and sounds a bit more formal/explicit. Both are correct:

Şofben açılınca…
Şofben açıldığında…

How can I say “as soon as” more explicitly?

Use the -ır/-mez pattern or a doubled form:

Active: (Biri) şofbeni açar açmaz su ısınıyor. (As soon as someone turns on the heater, the water heats up.)
Passive: Şofben açılır açılmaz su ısınıyor.

Can I drop şofben or change the word order?

Yes, if context is clear: Açılınca su hemen ısınıyor is fine. Turkish word order is flexible, so you could also say Su hemen ısınıyor, şofben açılınca, with a slight afterthought feel. Starting with the -ınca clause is the most neutral here.

Any pronunciation tips for tricky vowels and consonants here?

Ş = “sh.” Şofben sounds like “SHOF-ben” (standard spelling with f).
ı (undotted) in ısınıyor is a central “uh”-like vowel (no exact English equivalent).
hemen has two clear e’s: “HE-men.”