The Fjell journal

How long does an insulated bottle keep water hot? We tested it at -10 °C

18 June 2026 · 6 min read · Kristin Haugland

How long does an insulated bottle keep water hot? We tested it at -10 °C

We filled the Thermo Bottle 750 with 95 °C water and left it outside in Bergen at -10 °C for 14 hours. Here is what the thermometer showed every 2 hours.

We value your privacy

Essential cookies keep this site running. With your consent we use Google Analytics 4 (Consent Mode v2) to measure visits and Amazon Attribution clicks. No data is sold.