Vacuum Compartment: The Signature Technology Behind the Reputation of Hitachi Made in Japan Refrigerators

Using the power of Vacuum^*1 and sub-zero temperature to suppress oxidation and maintain freshness longer.
Platinum Catalyst with Ruthenium Vacuum Compartment
Easy - delicious, high freshness.

Preserves nutrients and moisture for delicious storage.

※Tested by Hitachi. Fresh food was used in the test.

Hitachi's freshness technology "Vacuum Compartment"

Low oxygen & low temperature suppress oxidation "Vacuum Compartment" ^*1

※Tested by Hitachi.

A vacuum pump and pressure-resistant structure remove air inside the compartment. With an environment of approx. 0.8 atm and about -1°C^*2, oxidation is suppressed to preserve food deliciously.

Reduces drying even without wrapping "Sealed structure"

※Tested by Hitachi.

One cause of food drying is direct airflow used for cooling. This compartment uses indirect cooling and a sealed structure to reduce drying.

Suppresses enzyme activity [Platinum catalyst]

※Tested by Hitachi.

Adopts a platinum catalyst that decomposes odour components from meat and fish into carbon dioxide and water. The CO₂ suppresses enzyme activity on the food surface, helping maintain freshness.

Achieves vacuum through a vacuum pump plus pressure-resistant and sealed structure.

Keep food fresh at "ice temperature" without freezing!

The temperature range from 0°C to the freezing point of food is called the "ice temperature zone." Utilizing this range offers various benefits. For example, fish has a freezing point of about −2°C, so storing it between 0°C and −2°C keeps it fresh without freezing.

Nutrition Retention

Helps maintain food freshness in a vacuum environment^*1 which prevents oxidation and supports nutrient retention.
^*Does not extend best-before or expiration dates.

^*2 Tested by Hitachi. Tested Model: R-GWC670TC. (Equivalent performance to R-GW670TV)
The effect may differ depending on types or freshness of food stored and does not extend to best-before and expiration dates.

^*2 Tested by Hitachi. Tested Model: R-GWC670TC. (Equivalent performance to R-GW670TV). Tested model for normal chilled room: R-K40H.
The effect may differ depending on types or freshness of food stored and does not extend to best-before and expiration dates.

^*1 Vacuum is a state of lower pressure than atmospheric pressure.
The pressure inside vacuum compartment is approximately 0.8 atmospheres, which is lower than atmospheric pressure, so Hitachi calls it a vacuum. This value represents the average pressure inside the compartment when operated for 3 days without opening or closing the door.
※Tested by Hitachi. The effect may differ depending on food types, condition, and quantity.^{*3 *4}

Freshness Preservation

Protecting the freshness of food without freezing at approximately -1℃ . No freezing or wrapping required. Enjoy fresh ingredients.

K-Value in Tuna Stored after 3 Days^*5

Initial Value: 10.5%
Vacuum Compartment: 19.5%

K-Value in Chicken Breast after 7 Days^*5

Initial Value: 42.4%
Vacuum Compartment: 59.9%

※Tested by Hitachi. The effect may differ depending on food types, condition, and quantity.^*5
*5 Tested by Hitachi. Tested Model for vacuum compartment: R-GWC670TC (Equivalent performance to R-GW670TV) K-value is an indication of freshness. The lower the value, the fresher the item. K-value of 20% or higher is not suitable for eating raw and K-value of 60% or higher is not suitable for consumption. The effect may differ depending on types or freshness of food stored and does not extend to best-before and expiration dates.

Suppresses Drip To Preserve Flavor

Tuna Stored after 3 Days^*6

Drip amount 1.73g/100g
Freezer (natural thawing in 3 hours)

^*6 Tested by Hitachi. The effect may differ depending on food types, condition, and quantity. Comparison of storage for 3 days between Vacuum Compartment (-1°C setting, unwrapped) of R-GWC670TC (equivalent performance to R-GW670TV) and freezer compartment (lower freezer, mid case, wrapped), then naturally thawed at room temperature (approx. 20°C) for about 3 hours. Room temperature set at approx. 20℃ and without door opening/closing.

Drip amount 0.51g/100g
Vacuum Compartment (-1°C)

※Tested by Hitachi. The effect may differ depending on food types, condition, and quantity.^*6

No freezing, no need to thaw.
Shortens cooking time.

No thawing required, so you can start cooking right away. Unused portions can be quickly returned, allowing efficient use with minimal waste.

^*The above claims do not extend the best-before or use-by date, nor do they guarantee the labelled storage period. ^*1 Vacuum is a state of lower pressure than atmospheric pressure. The pressure inside vacuum compartment is approximately 0.8 atmospheres, which is lower than atmospheric pressure, so Hitachi calls it a vacuum. This value represents the average pressure inside the compartment when operated for 3 days without opening or closing the door.
^*2 When the room temperature is approx. 32°C and the refrigerator compartment temperature has stabilized, the temperatures shown are approximate food temperatures.
^*3 Comparison of storage for 7 days between Vacuum Compartment (-1°C setting, unwrapped) of R-GWC670TC (equivalent performance to R-GW670TV) and refrigerator compartment of R-GWC670TC (■■ setting, wrapped). Room temperature set at approx. 20℃ and without door opening/closing.
^*4 Comparison of storage for 7 days between Vacuum Compartment (-1°C setting, peeled and wrapped) of R-GWC670TC (equivalent performance to R-GW670TV) and chilled compartment of R-K40H (peeled and wrapped). Room temperature set at approx. 20℃ and without door opening/closing.
^*5 Tested Model for vacuum compartment: R-GWC670TC (Equivalent performance to R-GW670TV) K-value is an indication of freshness. The lower the value, the fresher the item. K-value of 20% or higher is not suitable for eating raw and K-value of 60% or higher is not suitable for consumption. The effect may differ depending on types or freshness of food stored and does not extend to best-before and expiration dates.
^*6 Comparison of storage for 3 days between Vacuum Compartment (-1°C setting, unwrapped) of R-GWC670TC (equivalent performance to R-GW670TV) and freezer compartment (lower freezer, mid case, wrapped), then naturally thawed at room temperature (approx. 20°C) for about 3 hours. Room temperature set at approx. 20℃ and without door opening/closing.
○ This page introduces the features of the R-GW670TV.
○ Explanations are based on the R-GW670TV.
○ Data without specified testing authorities are based on in-house testing.