Water Pasteurization Indicator (WAPI)

Fred Barrett and Dale Andreatta

A wax-actuated thermometer that indicates when water has reached pasteurization temperature.

Product description Brand name and product description

The Water Pasteurization Indicator (WAPI) is an open-source hand-made thermometer that indicates when water has reached pasteurization temperature and is safe to drink. Rather than waiting for water to boil (which occurs at 100 °C and is far beyond the required temperature for destroying microorganisms), a WAPI uses a melting wax to indicate that water has reached 65 °C. This saves fuel by eliminating the need to boil water to ensure that the pasteurization temperature has been reached.

Target region(s) Target region for distribution/implementation (listed by country if specified)
Distributors/implementing organizations Organization(s) distributing/deploying this product directly to communities/individuals?"

Many organizations have made and distributed WAPIs including Agua Pura Para el Pueblo and Rotary International Clubs (such as Buford/North GwinnettCalabasas, and Monterey Sunrise).

Market suggested retail price Price per unit or service price per usage/terms (USD). Subsidies noted.

WAPI’s can be purchased online for about 10 USD or built from local materials for much less, depending on local market prices.

Competitive landscape Similar products available on the market. May not be a comprehensive listing.

Other temperature indicators such as candy thermometers.

SDG targeted United Nations Sustainable Development Goals (SDGs) targeted with this product/application/service

Goal 6: Clean water and sanitation

Target user(s) Target user/consumer base (country, income segment)

Households (particularly those who typically boil their water)

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