Grizzly 450 Cold Plunge with Active Aqua Chiller and Ozone

• Setup: under 20 minutes, every hose pre-built and every screw in the box
• Holds: 39°F to 90°F, set it and the chiller cycles on its own
• Sanitation: ozone and 50 micron filtration included, ozone runs on a timer
• Ships: within 2 business days from Texas. Freight is calculated at checkout.

What is the Plunge Crafters Grizzly 450 Cold Plunge?

The Plunge Crafters Grizzly 450 Cold Plunge is a complete cold plunge tub with chiller built on a 450 quart Grizzly rotomolded cooler. It pairs an Active Aqua 1/4 HP or 1/2 HP water chiller with a Danner Aqua-Mag 1200 pump, 50 micron filtration and InlineO3 ozone sanitation, and the plumbing connects through the cooler's two drain ports. The tub holds about 112 gallons and chills water as low as 39°F.

I started Plunge Crafters because I did not want to spend $5,000 on a cold plunge. This is the setup I would buy if I were starting over: a cooler built to hold ice for days, a chiller the cold plunge community trusts, and plumbing that is already done for you.

Which chiller do you need: 1/4 HP or 1/2 HP?

Choose the Active Aqua 1/4 HP (3,010 BTU/hr, rated for 40 to 92 gallons) for a garage, home gym or shaded patio where the air stays under about 85°F. Choose the 1/2 HP (4,020 BTU/hr, rated for 90 to 172 gallons) if your plunge sits outside through a hot summer, more than one person uses it daily, or you want to hold 39 to 45°F year round.

Set up in under 20 minutes

1. Set the Grizzly on a level surface and place the chiller beside it with 12 inches of clearance on the sides and 18 inches at the back.
2. Screw the power box, pump bracket and filter housing to the back of the Grizzly with the included screws. The outdoor power strip and ozone generator are already mounted inside the power box.
3. Thread the Torrent Twist connectors into the Grizzly's two 2 inch drain ports.
4. Connect the pre-built hoses in the order shown in the install video.
5. Fill, plug into a GFCI-protected outlet, set your temperature and set the ozone timer.

Your install video is emailed right after checkout, so you can watch the whole setup before the boxes arrive.

Cold plunge with chiller, filter and ozone included

Most prebuilt Grizzly cold plunges charge extra for sanitation or skip it. This one ships with the full water care system.

• Ozone on a schedule: the Ambohr SPA-124 ozone generator feeds our InlineO3 injector, and the included outdoor outlet timer runs it while nobody is in the tub.
• 50 micron filtration: a 10 inch filter housing with two cartridges, one installed and one spare.
• ChillGuard XL sleeve: keeps condensation off the filter housing. In humid weather the hoses will still sweat, so set up on a surface that can get wet or add foam pipe insulation to the hoses.
• A pump built to run 24/7: the Danner Aqua-Mag 1200 is American made, rated to 1,200 GPH and carries Danner's 5 year limited warranty. Its bracket holds it on the back of the Grizzly, off the ground.

Why a Grizzly 450 makes a great cold plunge tub

• Insulation built for ice: pressure-injected foam walls designed to hold ice for days, so your chiller cycles less.
• Room to sit: Grizzly markets the 450 as a two-person plunge. Most households use it one adult at a time with room to stretch.
• Built for abuse: RotoTough rotomolded polyethylene, a rubber lid gasket, BearClaw latches and padlock holes to keep kids out.
• Made in the USA by Grizzly and certified bear resistant by the IGBC.

Who this plunge is for

Great fit if you:

• Want a finished cold plunge with chiller without building one from a stock tank
• Plunge in a garage, home gym or backyard
• Want ozone and filtration handled from day one
• Live somewhere hot and need a real 1/2 HP option

Look elsewhere if you:

• Need hot tub heating too (the chiller only cools)
• Need app or Wi-Fi control
• Have to carry it upright through a narrow doorway (it is 38.5 inches wide)
• Already own a tub: the Quick Connect Cold Plunge Kit with Active Aqua Chiller turns it into a plunge for less

Warranty and support

• Active Aqua chiller: one-year manufacturer warranty, ships new from an authorized dealer
• Danner pump: five-year limited warranty
• Plunge Crafters components: one-year warranty
• Texas-based, BBB Accredited business that stands behind what we sell. Questions before you buy? Contact us.

Cold plunging is not right for everyone. Talk with your doctor before you start if you have a heart condition, high blood pressure, Raynaud's, are pregnant or have any other health concern.

Orders ship within 2 business days from Texas, and most arrive within 5 business days. Your plunge ships in more than one box: the Grizzly cooler ships separately from the chiller and equipment, so they may arrive on different days.

Freight is calculated at checkout. Inspect the cooler for damage before you sign for the delivery.

Check out our Shipping Policy for additional details.

We stand behind the quality and performance of every Plunge Crafters product. If for any reason you're not completely satisfied within 30 days of delivery, simply contact our support team to return the product in its original condition and packaging. 

How it works:

• Submit your return request within 30 calendar days of receiving your order.
• Return the unused product in its original packaging.
• Once received and inspected, your refund will be processed within 5–7 business days.