Most chiller headaches start with “I wish someone had told me…” This is your guide to skipping those costly surprises. We’ve replaced plenty of “commercial” units that couldn’t handle Australian conditions, and we’ve learned a lot along the way. Here are the eight essentials to know before you invest in a chiller. (Heads up: it’s a detailed read, and I’ll dive deeper into each point in future articles.)
1. Pool Size: Cooling Power Isn’t Just About Volume
Sizing a chiller isn’t as simple as “big pool, big unit.” It’s part of the equation, but there’s more to consider.
- Large pools (e.g., 5,000 litres) hold temperature better: they take longer to cool but stay cold and manage a person’s heat load well—think pool vs. bucket on a summer day.
- Small pools (e.g., 1,000 litres) cool fast but heat up faster: you need enough power to pull out each bather’s heat, or temps rise during back-to-back sessions.
- A chiller that’s too small runs non-stop, burns out, and still can’t keep up. One that’s too big cycles excessively, wasting energy and wearing out early.
2. Daily Capacity: Plunges Trump Headcount
It’s easy to focus on people per day instead of plunges—and that’s a common oversight worth addressing.
- Each person plunges 2-3 times: your 50 visitors turn into 100-150 dips daily.
- Water loss adds up: every swimmer takes ~2 litres out per plunge, so that’s 100-300 litres of 20+°C water needing to be chilled each day.
- Underestimating this puts extra strain on your chiller.
3. Sauna Use: Heat Load’s Sneaky Multiplier
Hot-cold therapy—sauna, plunge, repeat—is common, and it increases the challenge for your chiller.
- Heat load jumps 50% post-sauna: for an 80kg person, it’s 555.2 kJ to 832.8 kJ, as skin temp climbs from ~32°C to ~42°C.
- 50 people = 150-450 bather loads: that’s your 100-300 plunges with sauna cycling factored in.
- Your chiller needs the strength to handle this added demand.
4. Target Temperature: The 5°C Factor
Getting a bath to low temperatures—like 3-4°C—on a cold morning with no bathers is straightforward for most chillers. Holding that temp under real-world conditions is a different story entirely.
- Power needs escalate quickly: it takes far less energy to hold a pool at 15°C than at 10°C, and maintaining 5°C requires exponentially more power than 10°C.
- Sub-10°C targets need serious design: if you plan on keeping temps below 10 degrees, your chiller must be built to handle that demand—and it has to suit the climate where you live.
- Many companies advertise 3-4°C capability based on ideal scenarios, but those units often falter when bathers add heat load or conditions shift.
5. Power Supply: The Make-or-Break Detail
This one’s critical—don’t overlook it, because power issues can derail your whole setup.
- Single-phase vs. three-phase: check your switchboard before you buy. Three main circuit switches side by side (often joined together) mean three-phase power; just one switch means single-phase. Buying a three-phase chiller without three-phase power could leave you facing a six-figure bill to rewire your premises—if that upgrade’s even an option.
- Amps are key: most proper commercial chillers require 32-amp plugs. If your power supply offers less, the chiller might trip the circuit breaker as soon as you turn it on, or it simply won’t start at all.
- Always verify with the manufacturer if your setup doesn’t have 32-amp power available.
6. Ventilation: The Hidden Headache
Chillers are heat transfer machines—they pull heat from the water and release it into the air, and that’s a lot of heat to deal with. Overlooking this can lead to unexpected costs.
- Poor planning hits hard: I’ve seen recovery rooms slapped with $15,000–$30,000 bills to install industrial ventilation systems after the fact, because nobody warned them upfront.
- Heat needs an exit: if you’re placing your chiller in a back room or downstairs, you’ll need a robust ventilation setup to handle the heat output.
- Our solution helps: we developed a split system design for this exact reason—keeping all the heat and noise outside, while the cooling power stays inside near your pool.
- Thinking this through before you buy saves a major headache later.
7. Space Requirements: Size Matters
You can’t just tuck a chiller into a tight corner and expect it to perform—it needs space to breathe and function.
- Clearance is non-negotiable: wherever you place it, ensure one metre of clearance on all sides for fresh airflow and maintenance access.
- Poor placement causes issues: we’ve had recovery rooms buy our chillers, install them with no clearances or airflow (like in a cramped spot or alleyway), then call us saying the unit’s faulty. After moving those same chillers to spots with proper ventilation, they held 5°C without a hitch.
- Taking the time to pick a spot with good airflow and access pays off in performance and longevity.
8. Noise Considerations: Location Matters More Than You Think
Chillers aren’t loud—they’re about the same level as an outdoor AC unit—but where you place them can stir up trouble if you’re not careful.
- Noise isn’t the issue, perception is: one Sydney recovery room installed their chiller in what seemed like a secluded alleyway, only to find apartments above. A tenant complained, the council stepped in, and they had to move it to the roof at their own expense.
- Rules vary by council: in that case, the law capped noise at 5dB above ambient levels, but every council has its own standards.
- Check before you commit: a quick look at local regulations can save you from costly relocations down the track.
The Bottom Line: Nail This, Nail Your Setup
Buying a chiller isn’t about picking the most expensive option—it’s about finding the right fit for your setup, today and tomorrow. These eight factors determine whether you’ll enjoy smooth operations or face lukewarm plunges and breakdowns every summer. Get them right, and your members will love the crisp, cold experience. Miss the mark, and it’s cancelled sessions and frustration. Your choice matters.