Updated on February 21, 2024


Created on August 27, 2015

Sure Chill Vaccine Refrigerator BLF100 DC

Upcoming Update

The Sure Chill Vaccine Refrigerator is a solar direct drive refrigerator that can store up to 99L of vaccines.

Developed By
  1. Sure Chill
Tested By
  • Sure Chill
  • World Health Organization (WHO)
Content Partners


Product Description

Sure Chill Refrigerators regulate internal temperature and protect vaccine vials from ice, to prevent freezing while keeping the vaccines at the appropriately cold temperature so they can be delivered at efficacy to children and adults throughout the necessary regions. The refrigerator works by surrounding the vaccine vials with cold water.

Target SDGs

SDG 3: Good Health and Well-Being

Market Suggested Retail Price


Target Users (Target Impact Group)

Public Sector Agencies, NGOs

Distributors / Implementing Organizations

The Sure Chill Company, Godrej Appliances

Competitive Landscape

Manufacturing/Building Method

Manufactured in the UK

Intellectural Property Type


User Provision Model

Commercially available Interview with designer, August 2015

Distributions to Date Status


Gross storage capacity (L)


Holding Temp (°C)

4-5, stays within 1°C

Holdover Time (days)


Number of Shelves


Power Requirements

Solar array 200W to 370W depending on geographical location

Vaccine storage capacity (Liters)


Design Specifications

Sure Chill works on the principle that water is at its densest at 4°C. Water surrounds a Sure Chill refrigeration compartment. When power is supplied to the refrigerator, the water cools and ice is formed above the compartment leaving only water at 4°C and thus cooling the contents. When the power is switched off, the water warms and rises while the ice begins to melt. This keeps only water at a 4°C cooling the contents of the compartment keeping temperatures at 4 to 5°C. The temperature variation within the cabinet is less than 1°C. The solar ‘direct drive’ model of the Sure Chill vaccine refrigerator doesn’t need a battery to maintain cooling performance overnight. In severe power outages, it can keep vaccines at safe temperatures for ~10 days or more at 32°C ambient, and even longer at lower ambient temperatures. Dimensions: 89 cm x 76 cm x 185 cm Power consumption: Solar array 200W to 370W depending on geographical location Minimum rated ambient temperature: 5°C Vaccine storage capacity (litres): 99L Weight: 145 kg

Product Schematics

Technical Support

Licensed partners provide local technicians in their respective countries Interview with designer, August 2015

Replacement Components

Available from the manufacturer as needed Interview with designer, August 2015


2 year warranty available

Manufacturer Specified Performance Parameters

The temperature variation within the cabinet limited at less than 1°C. The Sure Chill vaccine refrigerator can keep vaccines at safe temperatures for 10 days or more at 32°C ambient, and even longer at lower temperatures. Minimum rated ambient temperature: 5°C. Ice never forms on the cabinet walls

Vetted Performance Status

Independent study showed Sure Chill protects vaccines and provides consistent cooling. Rated Grade-A freeze protection by WHO.


Vaccines must be stored at the proper temperature to maintain effectiveness.

Complementary Technical Systems

Can be powered by an electric outlet or solar panels.

Academic Research and References

Kartoglu, U., Milstien, J., Tools and approaches to ensure quality of vaccines throughout the cold chain. Expert Reviews: Vaccines [Internet] 2014 [cited 2015 May 29]; 13(7): 843–854.

Sirirat Techathawat et al., Exposure to heat and freezing in the vaccine cold chain in Thailand. Vaccine, Elsevier. [Internet] 2007 [cited 2015 May 29]; 25: 1328-1333.

S. Jones. Sure Chill Refrigeration Technology: Improving the Cold Chain in the Developing World. Global Humanitarian Technology Conference (GHTC), 2011 IEEE. [Internet] 2011 [cited 2015 May 29]: 205-207.

Sure Chill, “Corporate Brochure“, 2022


Compliance with regulations

WHO Pre-Qualified under Devices and Equipment category for Ice-Lined Refrigerator; PQS code -E003/019 ISO 9001:2008 certified

Evaluation methods

In-house testing conducted by The Sure Chill Company

Comments from the Community

1 Comment

  1. E4C.COMMENTS says:

    Steve Harston says:

    I believe that more of these categories should be able to be filled out if the product is “being readied for field evaluation” as stated under the tab “Manufacturing & Delivery”. While the final details may not yet be known, if they are doing a field study they should have at least have preliminary numbers on “Gross Storage Capacity”, “Holdover Time”, and “Vaccine Storage Capacity”. As the product is finalized, the numbers presented here can be modified to reflect these changes. Specifically with “Holdover Time”, even if they haven’t done detailed testing, it would be very beneficial to provide results from their preliminary testing but they should also comment that the results are preliminary.

    From my perspective the information provided under “Power Requirements” is not addressing the question that is being asked. They don’t state if it is intended to be plugged in most of the time, power consumption How is this intended to be used? Temporary no power? Solar driven? Information on the solar panel size could also help users better understand the power requirements of their product.

    I interpret the “Safety” category differently than the owners of this product did. I don’t know which is correct but I interpret it as what are the hazards of using the device. For example, if caustic Phase Change Material is used in their ice packs or if high voltage is required to run their system than these should be called out here.

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