It's a large enough volume of water, that adding insulation is feasible. | Hacker News

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mythhabit on March 14, 2024 | parent | context | favorite | on: Giant 'sand battery' holds a week's heat for a who...

It's a large enough volume of water, that adding insulation is feasible.

AnthonyMouse on March 14, 2024 [–]

But then why put it in the house and not e.g. in the ground?

mkesper on March 14, 2024 | [–]

1. Not possible everywhere 2. Probably more expensive

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