Aquastat

Aquastat is a term used for two distinct concepts in different domains: a heater control device used in boilers and hot-water systems, and FAO's global information system on water and agriculture.

In heating, an aquastat (or aquastat controller) is a thermostat that measures the temperature of the water in a boiler, furnace, or hydronic heating system and regulates the heat source to maintain a desired water temperature. It may be simple on/off control or more advanced modulating control; many aquastats include a high-temperature limit switch as a safety feature.

Operational notes: It usually includes a sensing element such as an immersion thermostat or temperature sensor connected to a control relay. Setpoints are adjustable; typical ranges depend on system (domestic hot water around 120-140°F; boilers vary). It helps improve efficiency and safety by avoiding overheating and reducing standby losses.

FAO AQUASTAT: The global information system on water and agriculture is a data platform that collects, harmonizes, and disseminates data on water resources, irrigation, water use in agriculture, and related indicators. It includes country profiles, time-series data, and maps, supporting policy analysis, planning, and benchmarking.

Data coverage: water withdrawal by sector, renewable resources, irrigation area, and water productivity; the system emphasizes standardized definitions and comparability across countries and over time. Data are compiled from national statistics, regional organizations, and international agencies.

Impact and accessibility: Aquastat is used by researchers, policymakers, and development professionals; data and reports are available through FAO's website, with periodic updates and projections for policy planning.