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--- reth:retained-heat [2025/12/05 10:50] – [What can I do?] dave
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+**Using a thermos flask**
+For cooking small amounts (say a single portion of rice or pasta), a quality thermos flask can be used in a similar way. The principle is the same as the haybox, but as the flask itself can’t be heated, follow these steps: pre-heat the flask with boiling water; bring rice/pasta to the boil in a saucepan; empty the flask; carefully pour (use a jam funnel if you have one) the contents of the saucepan into the flask; seal and leave to cook. Don’t hold the flask in your hand when pouring, in case you spill the boiling water. Don’t forget that rice and pasta expand when they cook so don’t fill the flask to the brim, and be careful when opening in case the flask has become pressurised.
+**Integrated cooking**
+Retained heat cooking can be used in combination with solar cookers and rocket stoves. This combination enables you to cook at any time, rain or shine, without fossil fuels. See [solar cookers](https://knowledge.growingthecommons.org/doku.php/solr/solar_cookers) for more information.
+<WRAP center centeralign>
+<figure>
+![](https://www.lowimpact.org/wp-content/uploads/retained-heat-fireless.jpg)
+<caption>
+It’s not a new idea – this is a vintage ‘fireless cooker’ from the 1920s.
+</caption>
+</figure>
+</WRAP>
+## Further resources
+## Specialist curators of this topic