Trying out the Sage by Heston Blumenthal the Tea Maker (Part 1 of 2)

This video is about Trying out the Sage by Heston Blumenthal the Tea Maker (Part 1 of 2)

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Thanks for the vid! What is the minimal amount of water you can put inside for the tea bucket to be submerged into the water sufficiently?
I assume 500ml?
Thanks!