For most Singapore restaurants, cafes, bubble tea shops and caterers, an air cooled ice machine is the better choice. It needs no extra water to cool the refrigeration system, it is simpler to install, and it avoids the water bill that comes with a single-pass water cooled unit. A water cooled machine makes sense only where the building already has a recirculating cooling water loop. If your kitchen is hot and cramped, the answer is usually an air cooled machine with a remote condenser, not a switch to water cooling.
This guide explains how each type works, what each costs to run at Singapore water rates, where each one fits, and how to choose for your premises.
TL;DR
- Air cooled machines reject heat to the surrounding air using fans. Water cooled machines reject heat to water running through the condenser.
- Single-pass water cooled machines use 100 to 300 gallons of water per 100 pounds of ice. Air cooled machines need no cooling water.
- Air cooled is the standard choice for most operations. Water cooled suits sites that already run a recirculating water loop, such as a cooling tower.
- In a hot, tight kitchen, specify an air cooled machine with a remote condenser and enough ventilation clearance before considering water cooling.
- Check the specification of any model with us before ordering, because cooling type, output and installation needs differ between models.
Table of Contents
- How the two cooling methods differ
- Water use: the main operating difference
- Energy use: a smaller difference than expected
- Heat and noise in a Singapore kitchen
- Side-by-side comparison
- When water cooling is still the right answer
- How to choose for your premises
- Our view on ice machine cooling
- Ice makers from Superior Kitchen Equipment
- FAQ
- Sources
How the two cooling methods differ
Every ice machine is a refrigeration system. It freezes water by pulling heat out of it, and that heat has to go somewhere. The condenser is the part that gets rid of it. The two types differ only in how the condenser is cooled.
- Air cooled: motor-driven fans move air through the condenser. The heat leaves the machine as warm air and ends up in the room.
- Water cooled: water runs through the condenser and carries the heat away. The water is either discarded after one pass (single-pass) or sent to a cooling tower and reused.
The ice itself is made from clean, filtered potable water in both cases. The cooling water in a water cooled machine is a separate, additional supply.
Water use: the main operating difference
Water is where the two types separate most clearly. According to the US EPA’s WaterSense guidance, single-pass water cooled machines consume 100 to 300 gallons of water to cool the machine per 100 pounds of ice produced, while air cooled machines need no cooling water. The same guidance puts total water use for single-pass units at up to 5 to 10 times that of air cooled models.
A water utility in the United States, LADWP, makes the same point: traditional water cooled units use a lot of water, while air cooled units use far less and still give reliable service. A municipal water efficiency guide adds that water cooled machines are about as energy efficient as air cooled ones, yet their water use makes them far more expensive to operate.
A worked example at Singapore water rates
The figures below are our own illustration, built from the EPA range above. They are not a quote for any machine.
Take a shop that makes 500 kg of ice a day.
- 100 to 300 US gallons per 100 lb works out to roughly 8 to 25 litres of cooling water per kilogram of ice.
- At 500 kg a day, that is about 4.2 to 12.5 cubic metres of cooling water per day.
- The published non-domestic rate for potable water was S$1.43 per cubic metre from 1 April 2025. At that rate, the cooling water costs roughly S$6 to S$18 per day.
- Over 365 days, that is roughly S$2,200 to S$6,500 a year, for water that goes straight down the drain.
This counts the water tariff only. Your PUB bill may include other charges, so check the rates that apply to your account. Even so, the example shows why single-pass water cooling is hard to justify when an air cooled machine of the same output needs none of it.
The EPA also notes that in a restaurant setting, an air cooled machine can save approximately 326,700 gallons of water a year compared with an equivalent water cooled unit, based on industry benchmarks. Treat that as a United States benchmark, not a Singapore figure.
Energy use: a smaller difference than expected
Water cooling transfers heat more effectively than air. In large chiller plants, that shows up clearly: NEA’s guidance on air-conditioning systems describes air cooled and water cooled chillers as two condenser designs, and water cooled plants generally use less electricity per unit of cooling.
That result does not carry over neatly to a single ice machine in a shop unit. A standalone ice maker has no cooling tower or plant room behind it. To use water cooling you would either run city water through once, which brings the water cost above, or build a recirculating loop, which brings its own equipment and upkeep. For an average restaurant, the electricity saving rarely covers either.
Heat and noise in a Singapore kitchen
Air cooled machines blow their heat into the room. In a Singapore kitchen, which is already warm and humid, this matters in three ways.
- Ventilation: the machine needs free airflow around it. A clearance of at least 15 cm is commonly specified, though you should follow the manual for your model.
- Ambient temperature: when the room stays above about 27°C, an air cooled machine struggles to shed heat and ice output can fall. The UC Davis commercial refrigeration report notes that more efficient ice makers also release less heat into the surroundings.
- Noise: fans make air cooled units louder than water cooled ones. This is a real advantage for water cooling in a quiet front-of-house area.
The remote condenser option
When the kitchen is hot, the professional answer is not to change to water cooling. The EPA’s kitchen guidance recommends that where air temperatures regularly exceed 27°C, you install an air cooled model with a remote condenser, so the heat-producing part sits outdoors. This moves both heat and fan noise out of the kitchen and avoids the water cost entirely.
In Singapore, a remote condenser needs a suitable outdoor or ventilated location and a refrigerant line run between the two units. Confirm what your landlord, management corporation or building owner permits before you commit.
Side-by-side comparison
| Factor | Air cooled | Water cooled (single-pass) | Water cooled (recirculating loop) |
|---|---|---|---|
| Cooling medium | Ambient air and fans | City water used once | Water from a cooling tower or similar loop |
| Extra water use | None for cooling | 100 to 300 gallons per 100 lb of ice | Low per machine, but the loop uses make-up water |
| Installation | Simpler: power, water supply for ice, drain, clearance | Adds a cooling water supply and drain | Needs connection to an existing loop |
| Heat into the room | Yes, unless remote condenser | Much less | Much less |
| Noise | Louder (fans) | Quieter | Quieter |
| Best suited to | Most restaurants, cafes, caterers, shops | Rarely advisable | Hotels, hospitals and large sites with a loop |
| Main risk | Poor ventilation cuts output | High, avoidable water bill | Loop maintenance and water treatment |
When water cooling is still the right answer
A water cooled machine can be sensible when the building already has a recirculating water system, such as a cooling tower serving a hotel, hospital or large food factory. The machine then uses water that is already being treated and reused. The US Department of Energy’s purchasing guidance for these machines is written for water cooled units under federal efficiency requirements, which shows the category is a niche, not the default.
Cooling towers carry their own duties. Warm, stored water can encourage Legionella, so tower systems need a monitoring and treatment regime. A UK compliance consultancy explains automated water temperature monitoring as one way to keep watch. It is written for UK sites, so use it for background and follow Singapore requirements for your own premises. PUB’s water efficiency guide for food and beverage manufacturers also lists dry cooling instead of cooling towers among its water-saving measures, which points the same way as air cooling for a single ice machine.
For a small or medium food business with no cooling tower, adding one just to serve an ice machine is not realistic.
How to choose for your premises
Work through these points in order.
- Check whether your building has a recirculating cooling water loop you are allowed to use. If not, rule out water cooling.
- Measure the space. Confirm the clearance around the machine and whether warm air can escape. A closed cupboard or a corner next to a fryer is a poor location.
- Estimate daily ice demand. Drinks-led businesses, such as bubble tea and cafes, and seafood displays use far more ice than a small restaurant. Size the machine to peak days, not averages.
- Check the kitchen temperature. If it regularly sits above about 27°C, ask for a remote condenser model or move the machine to a cooler, ventilated spot.
- Ask about the cooling type, output and electrical rating in writing before ordering, and plan a regular cleaning schedule for filters and condenser surfaces.
- Look at the whole cost, not just the purchase price: electricity, water, servicing and the cost of any ventilation work.
A cleaner, well-ventilated air cooled machine also keeps electricity use down, which is relevant if you are looking at energy efficient kitchen equipment as a whole. For wider budgeting, see our restaurant equipment cost guide for Singapore.
Our view on ice machine cooling
We supply commercial kitchen equipment to restaurants, caterers, food manufacturers and new food businesses in Singapore, and energy use is the theme of most conversations we have with owners. Ice machines tend to be bought late in a fit-out, once the budget is nearly spent, and the cooling type is rarely asked about.
Our position is practical. Avoid single-pass water cooling. The water cost is continuous and it buys you very little. Choose air cooled, give the machine room to breathe, and keep the condenser clean. If the kitchen is very hot, ask about a remote condenser before you consider anything else.
We also encourage owners to look at the electricity side, because it is what energy efficiency grants and savings usually address. Ask what grant support may apply to the equipment you are buying. We can advise on this when you contact us.
— David
Ice makers from Superior Kitchen Equipment
If you are ready to compare machines, our range includes a 500 kg ice maker and a tabletop ice maker for smaller counters. You can see other equipment on our collections page, or visit our showroom to look at units in person. Ask our team for the cooling type, output and installation requirements of the model you are considering.
FAQ
Which is better, air cooled or water cooled?
For most commercial kitchens in Singapore, air cooled is better. It uses no cooling water, costs less to install and is easier to maintain. Water cooled only makes sense where a building already has a recirculating cooling loop.
Do water cooled ice machines save electricity?
Water cooling transfers heat more efficiently in large chiller plants. For a single ice machine without a cooling tower, the saving is small next to the cost of the water needed. The EPA describes water cooled and air cooled machines as similar in energy efficiency, with water use being the costly difference.
What if my kitchen is too hot for an air cooled machine?
First improve ventilation and clearance around the machine. If the room still stays above about 27°C, the recommended option is an air cooled machine with a remote condenser, so the heat is released outside the kitchen.
How much water does a water cooled ice machine use?
Single-pass models use 100 to 300 gallons of cooling water per 100 pounds of ice, which is roughly 8 to 25 litres per kilogram. This is in addition to the water that becomes ice. Your actual figure depends on the model and on incoming water temperature.
Sources
- WaterSense at Work, Section 4.2 Commercial Ice Makers (US EPA)
- Tackling WaterSense Commercial Kitchens (US EPA)
- ENERGY STAR Automatic Commercial Ice Maker Specification
- Save Water with Air-Cooled Ice Machines (LADWP)
- Commercial Kitchens Water Use Efficiency and Best Practices Guide
- Public Utilities regulations, water tariffs (Singapore Statutes Online)
- Air-Conditioning and Mechanical Ventilation Systems (NEA)
- Product Characterization Report, Commercial Refrigeration (Cal-EPE Hub)
- Purchasing Energy-Efficient Water-Cooled Ice Machines (US Department of Energy)
- Best Practice Guide in Water Efficiency, Food and Beverage Manufacturing (PUB)
- Automated water temperature monitoring