Onsen Pools

A Japanese bathing tradition in Brooklyn — three salt-water pools, cold to hot, for the quiet rhythm of contrast.

Japanese-style onsen pools at World Spa, Brooklyn — salt-water pools at cold, warm and hot temperatures

The Room

The onsen is a Japanese bathing tradition — originally pools fed by geothermal hot springs, each prized for the minerals in its water. At World Spa, our onsen pools are simple salt water, set at three contrasting temperatures: cold (52°F), warm (101°F) and hot (104°F).

Move between them at your own pace. Warm through in the hot pool, brace in the cold, return to the heat — the slow rhythm of hot-cold contrast that the onsen was built for.

Cold, warm, hot — three pools, and the unhurried rhythm between them.

The Details

Temperatures: Cold 52°F · Warm 101°F · Hot 104°F
Water: Salt water
Best for: Hot-cold contrast, circulation, quiet soaking
Access: Included with any World Spa day pass
Location: 1571 McDonald Ave, Brooklyn, NY 11230

How to Use the Onsen Pools

Shower before entry. Start in the hot pool for 3–4 minutes to warm through, then dip into the cold pool for 20–25 seconds, and return to the heat. Cycle through at your leisure — the cold onsen also makes a perfect plunge after a sauna.

Why Guests Return

Circulation — hot-cold cycling gets the blood moving.
Muscle relief — soothes fatigue and tension.
Immune support — a natural lift.
Contrast therapy — three temperatures, one ritual.
Calm — a quiet recharge for mind and body.
Quiet soaking — the slowest, most unhurried stop on the circuit.

Onsen Pools, Answered

What is an onsen?

A Japanese bathing tradition of soaking in warm mineral pools. World Spa’s onsen pools use salt water at three contrasting temperatures.

How warm are the onsen pools?

Three pools: cold 52°F, warm 101°F and hot 104°F.

Are they natural hot springs?

The tradition comes from geothermal springs; at World Spa the onsen pools are salt water, set to those temperatures.

How do I use the onsen pools?

Warm up in the hot pool for a few minutes, dip into the cold for 20–25 seconds, and cycle through for the hot-cold contrast.

Are they included with admission?

Yes — included with any World Spa day pass.