[Domain]Three different Domain

Young

Dear My Colleagues

I have tired to make a radiant floor model.

But I'm in trouble.

As you know, there are three different domain types

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Room â€" Fluid Domain (Ideal Gas)

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Slab â€" Solid Domain (concrete)

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Tube â€" Fluid Domain (water)

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When I make room a fluid domain with idea gas, the fluid property of the tube domain (which was assigned with water) is changed automatically as water.

How do I separate the domain between room and tube?

Thanks your attentions