A commercial kitchen thawing food under a running faucet at roughly 6 gallons per minute uses about 360 to 540 gallons for 10 pounds of chicken breasts and 720 to 1,080 gallons for a case of tuna loin, per cycle. At a combined water and sewer rate of approximately $0.025 per gallon, that adds up to $5,475 to $9,855 per year for a small one-shift restaurant and as much as $65,700 per year for a high-volume institutional kitchen, from thawing alone.

Commercial kitchens know they use a lot of water, but most operators do not know how much of the bill goes directly down the drain during one activity: thawing frozen food. For most kitchens, thawing is one of the easiest places to cut water costs without changing anything about the food itself. Here is a data-driven breakdown of what running water thawing actually costs, by volume, dollar, and year.

Key takeaways

  • A commercial faucet runs at 4 to 8 GPM, so a 60 to 90 minute thaw at 6 GPM uses 360 to 540 gallons.
  • Combined water and sewer rates average about $0.025 per gallon, putting annual thawing costs between $5,475 and $65,700 depending on kitchen type.
  • In a CNSRV field test, four 8-pound turkey breasts used 900 to 1,080 gallons under a faucet; the DC:02 thawed the same product with fewer than 20 gallons.
  • A closed-loop system uses 5 to 20 gallons per cycle, a 95 to 98 percent reduction, cutting a mid-volume restaurant's thawing water bill to $137 to $548 per year.
  • The Metropolitan Water District rebate offers up to $800 back, and payback on water savings alone is typically under 12 months.

How much water does a single thaw cycle use?

A single running-water thaw cycle uses roughly 180 to 1,440 gallons depending on the protein. The calculation starts with faucet flow rate. A standard commercial kitchen faucet runs at 4 to 8 gallons per minute. Most operators leave the tap running at roughly full pressure during a thaw cycle, averaging around 6 GPM.

Protein / item Typical thaw time Gallons used (at 6 GPM) Notes
Chicken breasts (10 lbs) 60 to 90 minutes 360 to 540 gallons Most common thaw item
Whole salmon fillets (case) 90 to 120 minutes 540 to 720 gallons Common in seafood restaurants
Shrimp (5 lb bag) 30 to 45 minutes 180 to 270 gallons Faster but high frequency
Ground beef (10 lbs) 60 to 90 minutes 360 to 540 gallons
Tuna loin (case) 120 to 180 minutes 720 to 1,080 gallons CNSRV field data: 900 gal/cycle
Turkey breasts (4 x 8 lbs) 180 to 240 minutes 1,080 to 1,440 gallons Verified CNSRV field test

Field data

In a documented CNSRV field test, four 8-pound turkey breasts were thawed under a running faucet at a multinational grocery chain. The cycle used approximately 900 to 1,080 gallons of water and took over three hours. The same product thawed with the DC:02 in under 90 minutes using fewer than 20 gallons.

See also: how long it takes to thaw salmon.

What does running water thawing cost per year?

Running water thawing costs between $5,475 per year for a small one-shift restaurant and $65,700 per year for an institutional kitchen. Most operators only think about the water rate, but commercial kitchens pay for sewer discharge on top of water consumption, and the two are billed together. The combined water and sewer rate averages approximately $0.025 per gallon across most U.S. markets, and factoring it in makes the true cost jump significantly.

Kitchen type Cycles/day Gallons/day (est.) Gallons/year Annual cost (water + sewer at $0.025/gal)
Small restaurant (1 shift) 1 to 2 600 to 1,080 219,000 to 394,200 $5,475 to $9,855
Mid-volume restaurant (2 shifts) 3 to 4 1,800 to 2,880 657,000 to 1,051,200 $16,425 to $26,280
Hotel or catering kitchen 4 to 6 2,400 to 4,320 876,000 to 1,576,800 $21,900 to $39,420
Hospital or institutional kitchen 6 to 10 3,600 to 7,200 1,314,000 to 2,628,000 $32,850 to $65,700
Grocery seafood or deli dept. 4 to 8 2,880 to 5,760 1,051,200 to 2,102,400 $26,280 to $52,560

These figures use conservative assumptions. The upper end for a high-volume institutional kitchen can exceed 1,000,000 gallons per year and $65,000 annually in combined water and sewer costs from thawing alone.

Why do most kitchens not know this number?

Because water is billed as a single monthly total, never broken down by activity. Operators receive one bill covering everything from dish washing to cleaning to prep, and thawing is invisible inside that number.

That invisibility is part of why running water thawing has persisted as the default method. It is worth understanding the compliance side too. See our post on FDA Food Code Section 3-501.13 for why high water temps during thawing are also a health code issue, not just a cost one. The code itself is published in the FDA Food Code 2022, Section 3-501.13.

What does a 98 percent water reduction actually mean?

It means a cycle that used 540 to 900 gallons under a faucet uses about 5 to 20 gallons instead. The CNSRV DC:02 recirculates the same water throughout the thaw cycle rather than running it continuously down the drain, using approximately 5 to 20 gallons per cycle depending on the protein and volume. That is a reduction of 95 to 98 percent compared to running water thawing.

In practical terms, a mid-volume restaurant spending $16,000 to $26,000 per year in combined water and sewer costs from thawing would spend approximately $137 to $548 per year using a closed-loop system. That is a potential saving of over $25,000 annually for some operations.

Metric Running faucet (6 GPM) CNSRV DC:02
Water per cycle (avg protein) 540 to 900 gallons 5 to 20 gallons
Annual water use (3 cycles/day) 591,750 to 985,500 gallons 5,475 to 21,900 gallons
Annual cost (water + sewer at $0.025/gal) $14,794 to $24,638 $137 to $548
Thaw time 60 to 180 minutes 30 to 90 minutes
Water temp control None -- depends on tap Digital sensors, maintained below 70 degrees F
FDA compliant year-round Only if tap stays below 70 degrees F Yes -- independently verified

What rebates are available for switching to closed-loop thawing?

The CNSRV DC:02 is listed on the Metropolitan Water District rebate program (administered through SoCal WaterSmart), offering up to $800 back on purchase, and the CalWEP program offers additional discounts for qualifying kitchens. For kitchens in California and other water-stressed markets, the switch does not just save on operating costs. See the full available rebates page for current programs by region, or our rebates guide by state.

For most kitchens, the payback period on water savings alone is under 12 months. With rebates applied, some kitchens are seeing six months or less.

Related reading: The Good and Bad of Cold Water Food Defrosting covers the pros and cons of cold water thawing, and How to Scale Commercial Kitchen Thawing for Thanksgiving and Holiday Volume covers planning for the holiday rush.

What is the bottom line on thawing water waste?

Commercial kitchens waste a measurable, calculable amount of money on thawing water every year. Most operators do not know the number because it is buried in a combined utility bill. When isolated, it is almost always higher than expected.

The fix does not require changing the menu, retraining staff on food handling, or installing new plumbing. A closed-loop thawing system plugs into any existing prep sink and pays for itself in a matter of months.

See the numbers for your kitchen

Use the CNSRV savings calculator to estimate your annual thawing water cost and payback timeline. Or find a rep in your area to get a custom quote.

Frequently asked questions

How many gallons of water does thawing food under a running faucet use?

At a typical 6 GPM faucet, a 60 to 90 minute thaw uses 360 to 540 gallons. A case of tuna loin uses 720 to 1,080 gallons, and four 8-pound turkey breasts can use 1,080 to 1,440 gallons in one cycle.

How much does running water thawing cost a restaurant per year?

Using a combined water and sewer rate of about $0.025 per gallon, a small one-shift restaurant spends $5,475 to $9,855 per year, a mid-volume two-shift restaurant $16,425 to $26,280, and a hospital or institutional kitchen $32,850 to $65,700.

How much water does a closed-loop thawing system use per cycle?

The CNSRV DC:02 uses approximately 5 to 20 gallons per thaw cycle depending on the protein and volume, because it recirculates the same water instead of running it down the drain. That is a 95 to 98 percent reduction versus a running faucet.

What is the payback period on a closed-loop thawing system?

For most kitchens, payback on water savings alone is under 12 months. With rebates applied, some kitchens are seeing six months or less.