Energy efficiency · Industrial refrigeration · Buyer guide
Refrigeration heat recovery: what cold-store and food-plant buyers should know
A refrigeration plant rejects the heat it removes plus the energy its compressors add. Part of that heat can be reused — from screw-compressor oil coolers, a desuperheater before the condenser, the condenser itself, or a heat pump that lifts it to a higher temperature. It only pays when a heating demand on site matches the heat in temperature and timing, so start from your heating profile, not from equipment. ColdMatch reviews heat-recovery and refrigeration projects of USD 250,000 and above and gathers comparable supplier offers for you.
Last reviewed 22 October 2026 · ColdMatch Group editorial team · Technical references: EECA (New Zealand), NSW Government (Australia), UK HSE, US CDC. Confirm figures for your plant with a qualified refrigeration engineer.
Where recoverable heat comes from
Shares are of total condenser heat rejection, as given in EECA's good-practice guide. Your plant's figures depend on refrigerant, load and design temperatures.
| Heat source | How much heat | Temperature | Typical uses and watch-outs |
|---|---|---|---|
| Screw-compressor oil coolers (external heat exchanger) | Typically under 20% of condenser heat | Often up to about 60 °C | Hot-water or boiler-feed preheating; potable water may need an intermediate loop in case of oil leaks |
| Desuperheater before the condenser | Up to about 15% of condenser heat | Up to about 60 °C | Depends on the refrigerant's discharge superheat and whether an oil cooler already takes heat |
| Main condenser | The biggest share of the heat, but low-grade | Always below the condensing temperature | Freezer underfloor heating, defrost glycol, process-water preheat, winter space heating |
| High-temperature or CO₂ heat pump | Lifts refrigeration heat to a higher level | Set by the heat pump design | Where heating spans roughly 30 °C to above 60 °C, a transcritical CO₂ heat pump may be an option |
Source: EECA Good Practice Guide – Industrial Refrigeration, sections 4.2.3 and 4.3.10 (accessed 22 October 2026).
Match the heat to a real demand
Recovered heat only has value if something on site uses it at that temperature. Compare the refrigeration load by hour and season with the heating demand; if they do not occur together, you need a hot-water tank or another buffer. EECA notes that condenser heat recovery is often not cost-effective unless the site needs a lot of low-grade heat, and that holding head pressure artificially high to make warmer water is generally not worthwhile.
Risks to manage
Treat heat recovery as part of the refrigeration system's safety and hygiene design, not as an add-on.
- Water contamination: use an intermediate loop where a leak in a refrigerant or oil heat exchanger could reach drinking or process water.
- Legionella: UK HSE guidance describes storing hot water at 60 °C and distributing it to reach at least 50 °C; the US CDC gives similar limits. Recovered heat at lower temperatures needs top-up heating or a hygiene design that meets your local rules.
- Refrigerant and pressure safety: heat pumps and heat exchangers on ammonia or CO₂ systems fall under refrigeration safety standards such as EN 378 / ISO 5149 or local equivalents.
- Plant efficiency: ask for compressor power with and without recovery at the same cooling duty.
- Controls: the plant must still reject heat safely when heating demand stops.
What drives the cost
Prices depend on the site, so none are published here. Ask every supplier to price the same scope and list exclusions.
- Heat exchangers (oil cooler, desuperheater, condenser side) and materials
- Pipework distance to heat users, and insulation
- Buffer tanks and hydraulic integration with existing boilers
- Heat-pump capacity and supply temperature, if used
- Controls, metering, commissioning and any shutdown to tie in an existing plant
Worked arithmetic (illustration only)
Assume a plant delivering 500 kW of cooling with 200 kW of compressor input at one operating point. It rejects about 700 kW of heat at that point. If a desuperheater took about 15% of it, that is roughly 105 kW at up to about 60 °C — and only while the plant runs at that load. This shows the energy balance; it is not a benchmark, a supplier figure or a savings estimate.
Where ColdMatch fits
ColdMatch is a buyer-first procurement service. The team reviews heat-recovery and refrigeration requests of USD 250,000 and above, contacts suitable suppliers on your behalf and presents organised, comparable offers. Supplier heat balances are shown as supplier claims until checked against documents; final design stays with qualified engineers.
How to request heat-recovery quotes
- Record the refrigeration load profile (by hour and season) and the refrigerant.
- List each heat user with its required temperature and daily and seasonal demand.
- Add plant-room space, distance to heat users, shutdown windows and water-hygiene rules.
- Submit the RFQ. Projects of USD 250,000 and above are reviewed by the ColdMatch team; smaller projects are pointed to the free tools.
Related guides
Buyer questions
Is refrigeration heat recovery worth it for a cold store?
Only when the site has a heating demand that matches the recovered heat in temperature and timing — for example freezer underfloor heating, defrost glycol, process-water preheat or space heating. Without such a demand the heat has no use.
How much heat can a desuperheater recover?
EECA's good-practice guide gives up to about 15% of condenser heat at up to about 60 °C, depending on the refrigerant and on whether an oil cooler also takes heat. Ask suppliers for a heat balance at your operating points.
Can heat recovery be added to an existing plant?
Often, for example with external oil coolers, a desuperheater or a heat pump, but it needs a design review of controls, head pressure, space and shutdowns. Treat retrofit claims as supplier statements until checked. ColdMatch reviews projects of USD 250,000 and above.
Does recovered heat make hot water safe to use?
Not automatically. Stored hot water must still meet Legionella-control rules, and drinking-water systems usually need an intermediate loop separating them from refrigerant and oil heat exchangers.