Yes, cold plunges come both ways. Some brands build the chiller directly into the tub as one sealed unit, like the Modouge All-In-One Cold Plunge. Others sell the chiller separately, like the Modouge Portable Cold Plunge Chiller, which clips onto a tub you already own, including a bathtub or stock tank. Neither setup is universally better. It depends on whether you already own a tub and how much space you have.
Yes, cold plunges come both ways. Some brands weld the chiller into the tub itself, so the whole thing is one sealed unit. Others sell a chiller as its own box that clips onto whatever tub you already have, from a stock tank to your home bathtub.
Which one makes sense depends on whether you already own a tub, how much space you have, and whether you'd rather move the chiller on its own or replace the whole setup down the line.
Built-In Chillers: One Sealed System
A built-in chiller is plumbed directly into the tub at the factory, so the pump, filtration, and cooling coil work as a single closed loop. Integrated systems generally offer better cooling performance and a smaller footprint than bolting a separate unit onto a tub, since every component is sized to work together from the start. The Modouge All-In-One Cold Plunge runs this way: a 1HP chiller and ozone filtration in one unit.
Standalone Chillers: The Modular Option
A standalone chiller is its own appliance. It sits next to the tub, runs a hose in and a hose out, and cools whatever container you connect it to. This is the more flexible option if you already own a tub, a stock tank, or even a bathtub you don't want to replace. The Modouge Portable Cold Plunge Chiller is built for exactly this, plug-and-play, WiFi-controlled, and rated to hold 37°F in almost any vessel.
Why Some Brands Sell Both
Modouge sells both configurations because the right answer depends on what you're starting with. If you're buying a cold plunge setup from zero, the All-In-One's built-in chiller is simpler: one purchase, one delivery, one unit to maintain. If you already have a tub taking up space in the garage or a bathtub you're not ready to give up, the Portable Chiller solves the temperature problem without asking you to buy a second tub.
Performance Differences Between the Two
Built-in systems typically win on raw performance and footprint, since the chiller, pump, and insulation are engineered around one tub shape. Built-in units also simplify maintenance, since there's one system to service instead of two separate components. Standalone chillers trade a little of that efficiency for flexibility. You can move a portable chiller between tubs, take it with you if you relocate, or use it seasonally on an outdoor stock tank without hauling the whole tub around.
Which Setup Should You Buy?
Buy built-in if you're starting fresh and want the simplest possible setup: one unit, one warranty, done. Buy standalone if you already own a tub worth keeping, need to move the chiller between spaces, or want to test cold plunging before committing to a dedicated tub. Both configurations hold the same 37°F floor. The choice comes down to what you already have sitting in your garage or bathroom, not which one gets colder.
FAQ
Do all cold plunges have built-in chillers?
No. Some tubs have the chiller built directly into the unit, while others are sold as a tub and a separate standalone chiller you connect yourself.
Is a built-in chiller better than a standalone one?
Built-in systems generally offer better cooling performance and a smaller footprint since every part is engineered together. Standalone chillers offer more flexibility since you can move them between tubs.
Can I buy just the chiller without a new tub?
Yes. Standalone units like the Modouge Portable Cold Plunge Chiller are designed to attach to a tub, stock tank, or bathtub you already own.
Do standalone chillers get water as cold as built-in systems?
Yes, a comparable horsepower standalone chiller can hold the same 37°F floor as a built-in system. The difference is footprint and integration, not the coldest temperature achievable.
Which is easier to maintain, a built-in or standalone chiller?
Built-in systems are generally simpler to maintain since the pump, filtration, and chiller work as one sealed system rather than separate components you service individually.
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