Let’s be completely honest: the absolute worst part about owning a CO-Z Inflatable Hot Tub is the waiting game. Because budget-friendly inflatable spas run on standard household outlets (110V-120V), their heaters are usually capped at a modest 1350W.
In the real world, that means your water heats up at a agonizingly slow rate of 1°F to 3°F per hour. If you fill your tub with cold hose water, you could be waiting up to 24 to 36 hours before you can actually get in!
Luckily, you don’t just have to sit there staring at the thermometer. Here are 5 genius, budget-friendly hacks to blast through the warming phase and get your CO-Z tub steamy in record time.
1. The “Hot Tap” Jumpstart
The absolute fastest way to heat your hot tub is to never put cold water in it to begin with.
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The Hack: Instead of hooking up your garden hose to the freezing outdoor spigot, use an adapter to connect your hose to an indoor faucet (like your kitchen sink or utility sink). Mix the hot and cold tap water so it flows into your tub at around 80°F to 90°F.
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Why it works: You are effectively skipping the first 12–15 hours of the heating cycle.
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⚠️ Warning: Never fill the tub with boiling water straight from the tap or a kettle. Water hotter than 120°F can warp the PVC liner or weaken the seams of your CO-Z. Aim for “warm bath water.”
2. Double-Down with a Floating Thermal Blanket
Your CO-Z comes with an inflatable cover, but it’s not perfect. It traps air, but a lot of heat still escapes from the water’s surface while the heater is working overtime.
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The Hack: Buy a cheap solar pool blanket (or a heavy-duty sheet of bubble wrap) and cut it into a perfect circle that matches the inside diameter of your tub. Float this directly on top of the water, then put your standard CO-Z cover over it.
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Why it works: It acts as a primary barrier, trapping the rising heat before it even hits the air gap under your main lid. It can shave hours off your heating time.
3. Insulate the Bottom (The Foam Board Trick)
Think about where your hot tub is sitting. Is it on a cold concrete patio? A chilly wooden deck? Cold ground will literally suck the heat right out of the bottom of your tub like a sponge.
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The Hack: Before you inflate and fill your CO-Z, head to the hardware store and buy a few sheets of Interlocking Foam Gym Mats or rigid EPS foam insulation boards. Tape them together and place them underneath the tub’s ground cloth.
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Why it works: Creating a thermal break between the cold ground and your spa water prevents “thermal bridging.” Your heater won’t have to work twice as hard to fight the cold floor.
4. Keep the Bubbles OFF While Heating
It is incredibly tempting to turn on the jets to “mix the water up” while it’s heating. Don’t do it.
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The Hack: Keep the bubble jet function completely turned off until you are ready to physically step into the tub.
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Why it works: The CO-Z bubble ring works by pulling ambient outside air and forcing it into the water. If the air outside is 65°F, turning on the bubbles blasts cold air directly into your warming water, instantly dropping the temperature.
5. Build a “Spa Jacket” For Cold Weather
If you are trying to heat your CO-Z in the autumn or early spring, the thin PVC walls of the tub are constantly fighting the cold outside air breeze.
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The Hack: Wrap the exterior walls of your inflated tub in Reflectix (foil bubble wrap insulation) or a couple of heavy-duty moving blankets while it heats up. You can secure it easily with a couple of bungee cords.
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Why it works: This essentially turns your budget inflatable into a high-end thermos. It traps the ambient heat generated by the pump motor and keeps the outer walls from cooling down.
The Ultimate Speed Setup Checklist
To get your tub from 50°F to 104°F by tonight, combine the hacks:
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Fill with warm tap water (around 85°F).
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Ensure the tub is sitting on a foam insulation base.
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Float a thermal bubble-wrap blanket on the water surface.
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Clip the top cover tightly.
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Leave the bubbles off until it’s time to soak.
By using these tricks, you can easily cut your wait time down from an entire weekend to just a few short hours.
What temperature is your water sitting at right now? If you are trying to heat your tub in freezing weather, let me know—there is one extra safety precaution you need to take with the CO-Z pump!
