Water chiller on Shabbat

Shabbat
1

We have a water chiller and instant hot under our sink.
I know that the instant hot cannot be used on Shabbat.

As water from the chiller is used, new water enters it, to be cooled down, sort of like a mini-fridge.
Can this be used on Shabbat?

Thanks

2

Thats a question thats dependant on the type of cooler. If it goes on immediately when you take water it’s a problem. Otherwise it would be ok. It’s like opening a fridge