Glycol Chiller & Glycol Cooling System Guide

Posted by Ron on 28th Oct 2026

A glycol chiller keeps a mix of food-grade propylene glycol and water at a set temperature and pumps it through a closed cooling loop. The mixture absorbs heat along the way, then returns to the chiller to be cooled again. In draft beer systems, the unit is often called a glycol power pack.

Bars and restaurants use a glycol cooling system to keep beer cold between the walk-in cooler and the draft tower. Breweries use one to control fermentation and storage tank temperatures. The principle is similar, but the equipment and sizing requirements differ.

Quick answer: A glycol chiller cools and circulates a glycol and water mixture through a separate cooling circuit. In a draft beer system, that circuit runs alongside the beer lines and through compatible tower cooling components. In a brewery, it removes heat through tank jackets or coils. During normal operation, the coolant does not come into contact with the beer.

What Is a Glycol Chiller?

A refrigerator cools the air inside a cabinet. A glycol chiller sends cold fluid to the equipment that needs cooling. This can be a draft beer trunk line, a glycol-cooled tower or the cooling jacket of a brewery tank.

Glycol chillers in different sizes and configurations for draft beer systems and brewery cooling — Glycol chillers are available in different sizes and configurations for draft beer and brewery cooling.

How Does a Glycol Chiller Work?

The refrigeration circuit chills the fluid, and a circulation pump moves it through the cooling loop. One full cycle looks like this:

The chiller cools the glycol mixture.
The refrigeration circuit removes heat from the fluid in the reservoir, often called the glycol bath, or through a heat exchanger.
The pump circulates the mixture.
Chilled glycol travels through insulated supply lines to the equipment that needs cooling.
The mixture absorbs heat.
In a draft system, heat transfers from the beer lines to the coolant lines bundled beside them. In a brewery, the mixture removes heat through the tank jacket or coil.
The mixture returns to the chiller.
The warmed fluid flows back through the return line. The chiller removes the heat it collected, and the cooling cycle continues.

The required glycol temperature depends on the application and equipment. Use the setpoint specified for your installation and make sure the mixture provides adequate freeze protection at the coldest point in the circuit.

Glycol does not push the beer. Gas pressure or a beer pump moves beer through its own lines. The glycol circuit carries heat away.

What Is Glycol Used for in Draft Beer Systems and Breweries?

Before choosing a glycol chiller, decide what you need to cool. Keeping beer lines cold is a different load from pulling heat out of a fermenting tank.

Application	What the chiller cools	What drives the sizing
Draft beer system	Beer lines in the trunk line and compatible glycol-cooled tower components	Trunk line length and construction, tower cooling load, insulation and temperature along the route
Brewery tank cooling	Fermentation, brite or storage tanks through jackets or coils	Tank volumes, target temperatures, cold-crash timing and how many tanks cool at once

Glycol Chillers for Draft Beer Systems

In a long-draw draft system, kegs sit in a walk-in cooler away from the bar. Beer reaches the faucets through an insulated bundle called a beer trunk line. It contains beer lines alongside separate glycol supply and return lines.

Insulated beer trunk line with separate beverage and glycol cooling lines — An insulated trunk line carries beer and glycol through separate lines between the cooler and the draft tower.

As the distance between the walk-in cooler and the faucets increases, keeping the beer lines cold becomes more demanding. Glycol cooling is commonly used for longer runs. A forced-air system can suit some shorter installations, depending on the route and equipment design.

The walk-in still has to keep the kegs cold. A glycol chiller protects the beer along the route to the tower; it does not replace keg refrigeration.

Glycol cooling circuit showing chilled coolant flowing from the chiller pump to a four-tap draft beer tower and returning to the chiller — Glycol cooling in a four-tap draft tower. Blue shows chilled glycol flowing from the pump toward the tower; red shows the return to the chiller. Beer travels through separate lines, which are not shown.

Inside a glycol-cooled tower, coolant passes through the cooling components provided by the tower design. Their coverage varies, so a glycol connection alone does not mean every part of the faucet assembly is actively cooled.

A well-designed system cuts down on warm-beer foaming, but temperature is only part of a good pour. Gas pressure and line resistance matter too, and so does keeping the lines clean.

For the full breakdown of components, read our guide to glycol draft beer systems.

Planning a bar installation? Browse glycol chillers for draft beer systems and use the draft chiller sizing calculator for an initial estimate. Have your trunk line length and faucet count ready.

Glycol Chillers for Brewery Tanks

Yeast generates heat during fermentation. A brewery glycol chiller circulates cold glycol through the tank's cooling jacket or coil to carry that heat away and hold the temperature you set.

Example brewery tank glycol circuit with supply and return lines, a temperature probe, controller and bypass valves — Illustrative brewery tank cooling circuit with a bypass. Blue marks the chilled glycol supply, and red marks the return. The probe measures tank temperature. Valve selection and control wiring depend on the installation; this diagram is not a valve wiring or installation guide.

Cold crashing places a different demand on the system: the chiller must lower the beer temperature within the time available. Cooling capacity matters, but the tank jacket and glycol flow also limit how quickly heat can be removed.

When several tanks call for cooling at once, the chiller and circulation system have to cover the combined demand. Tank volume alone won't tell you the right model.

Explore BrewChill Pro brewery chillers and start with the brewery chiller sizing calculator. For a closer look at the calculation, read how to size a brewery glycol chiller.

What Are the Main Parts of a Glycol Cooling System?

Configurations vary, but most systems use these core parts:

Glycol chiller: the refrigeration unit that removes heat from the returning mixture.
Reservoir or heat exchanger: holds or cools the fluid, depending on the design.
Circulation pump: moves the mixture through the loop.
Supply and return lines: carry glycol out to the equipment and back.
Temperature controls: the chiller controller maintains coolant temperature. Separate tank controls regulate cooling at each vessel where independent temperature control is required.
Insulation: limits heat gain along the lines.

A draft system adds a trunk line and dispensing towers. A brewery system connects to tank jackets or cooling coils. Each independently controlled tank needs temperature sensing and a way to regulate its cooling, such as a controlled valve or a dedicated pump.

What Type of Glycol Is Used in Chillers?

Use food-grade propylene glycol formulated for heat-transfer applications and approved for your chiller. Check the fluid specifications for equipment compatibility and the required water quality.

Food-grade status does not make a coolant leak into beer acceptable. If a leak is suspected, stop dispensing and hold the affected product for assessment.

Propylene glycol lowers the freezing point of the mixture. Water contributes to heat transfer, and the finished solution carries heat back to the chiller. The concentration must provide adequate freeze protection at the lowest temperature expected in the circuit.

The BrewChill Pro, ChillPro and G30 models covered in our food-grade propylene glycol guide specify a finished mixture of 40% glycol and 60% water by volume. This ratio is also listed in the BrewChill Pro 7500-2 specification. Check your exact model's specification and the concentration of the fluid before mixing. Ready-to-use or partially diluted products require different preparation from undiluted concentrate.

More glycol is not necessarily better. Excessive concentration increases viscosity and can reduce heat-transfer performance while increasing pump load. Use the concentration specified for the equipment and fluid.

What Are the Benefits of a Glycol Cooling System?

Cold Beer Over Long Distances

When the faucets are far from the keg cooler, the beer needs cooling along the entire route. A glycol-cooled trunk line limits warming between pours and helps keep serving temperatures more consistent.

Temperature Control for Brewery Processes

A brewery chiller removes fermentation heat and supports cooling before storage or packaging. With equipment sized for the process, brewers can control tank temperatures without relying on the temperature of the room.

Planning for Additional Taps or Tanks

A glycol system can be designed with spare cooling capacity for future equipment. Adding taps or tanks still requires a load calculation and a check of the pump and piping capacity. A larger reservoir alone does not establish how much additional cooling the system can deliver.

Are There Any Drawbacks to Using a Glycol Chiller?

A glycol system adds equipment and maintenance. Before buying, consider:

Upfront cost: budget for the chiller and the connected cooling circuit, including installation.
Space and airflow: an air-cooled chiller gives off heat and needs the clearance listed in its manual.
Fluid upkeep: glycol concentration and condition need regular checks.
Correct sizing: an undersized chiller can fall behind during busy service or cold crashing.

For a short setup where the keg sits directly below the faucet, a kegerator is usually the simpler option.

What Size Glycol Chiller Do You Need?

Start with the application. Draft beer cooling and brewery tank cooling require different sizing calculations.

Compare cooling capacities at the stated rating conditions. A chiller's available capacity changes with operating temperatures, so the published BTU/hr figure must be checked against the intended application.

For a Draft Beer System

For a bar or restaurant, note the number of faucets and the trunk line length and type. Include the locations of the walk-in cooler and towers. Room temperature along the line run and the condition of the insulation also affect the load.

The Glycol Chiller BTU Sizing Calculator provides a preliminary estimate based on your system details. For a worked example, read How to Size a Glycol Chiller for Your Draft Beer System.

For a Brewery

List every tank that could need cooling at the same time. For each tank, record its working volume, starting temperature and target temperature. Include the time available for cold crashing. Tank insulation and heat gain through the piping also affect equipment selection.

The Brewery Chiller Sizing Calculator provides a starting estimate. Actual cooling time also depends on glycol supply temperature, flow rate and jacket area.

Check Pump Performance as Well as Cooling Capacity

A chiller can have enough refrigeration capacity and still deliver too little coolant to the equipment. Pump selection must account for the resistance of the complete circuit, including the fluid concentration and operating temperature.

Check the available flow at the required operating head, rather than relying on the pump's maximum flow rating. Pipe dimensions and fittings affect resistance, as do the connected tank jackets or tower cooling components. Long or complex circuits need a hydraulic review alongside the cooling calculation.

How Do You Maintain a Glycol Chiller?

Use the service schedule in your chiller manual. Between service visits, check the parts of the system that affect cooling:

Monitor glycol temperature and, for draft systems, compare it with beer temperature at the faucet.
Check the reservoir level and inspect fittings for leaks.
Test glycol concentration at the interval specified by the fluid supplier and equipment manufacturer. Use an instrument and conversion chart suitable for the fluid.
Inspect exposed trunk line insulation for gaps, damage or condensation.
Keep the condenser coil clean and ventilation openings clear.
Investigate new noise from the pump or compressor.

Ice in the bath, cloudy fluid or beer warming during service can indicate a problem. Find the cause before adjusting the concentration or replacing the mixture. Pump and refrigeration faults should be assessed by a qualified technician.

Where Can You Buy a Glycol Chiller?

BeverageCraft carries glycol chillers and components for draft beer installations and brewery tank cooling across Canada and the USA. Check the product listing for availability in your country.

What to Include in a Chiller Selection Request

For a draft installation, send the trunk line length and type, faucet count and tower details. Describe where the line will run, especially any warm sections.

For brewery cooling, include each tank's working volume and which tanks need cooling at the same time. State the starting and target temperatures and the time available for cold crashing.

These details distinguish a system that holds already-cold beer at temperature from one that must remove a substantial amount of heat. Distance or tank volume alone does not establish the required chiller capacity.

Email your setup details and delivery location to sales@beveragecraft.com for help with equipment selection and a quote.

Frequently Asked Questions

Does glycol come into contact with beer?+

No. During normal operation, glycol circulates in a separate cooling loop. Beer flows through its own lines or remains inside the tank. If a leak is suspected, stop dispensing and hold the affected beer for assessment under your food-safety procedures.

What type of glycol is used in a glycol chiller?+

Use food-grade propylene glycol formulated for heat-transfer applications and approved for your chiller. Follow the equipment and fluid supplier specifications for concentration and water quality.

What glycol to water ratio should I use?+

Use the ratio specified for your model. The BrewChill Pro, ChillPro and G30 models covered in our food-grade propylene glycol guide specify a finished mixture of 40% glycol and 60% water by volume. Check your exact model's specification and the product concentration before mixing, as premixed fluids require different preparation.

Can one glycol chiller cool both draft lines and brewery tanks?+

A shared system is possible when it is designed for both applications. The cooling capacity, supply temperature and circulation arrangements must meet the combined demand. Do not assume that a draft chiller can also handle brewery tanks without checking the load and equipment requirements.

Does a glycol chiller replace a walk-in cooler?+

No. In a typical long-draw draft system, the walk-in keeps the kegs cold. The glycol chiller helps maintain beer temperature in the trunk line and at compatible glycol-cooled towers.

How often should glycol be replaced?+

There is no fixed replacement interval for every system. Follow the equipment and fluid suppliers' instructions. An incorrect concentration may be corrected after testing, while contamination or fluid deterioration may require cleaning and replacement. Investigate ice formation or changes in the fluid before deciding what service is needed.