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by rascul
1164 days ago
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> Ideally I can build some giant container of sand with some cinderblock, run some copper through the sand, and heat both using the wood being burned. Then, I could pump water through the copper which is being passively heated from the sand into my existing hot water baseboard, but it's unlikely to be hot enough - oh well. Is that a similar idea to the sand battery in Finland? It was on HN last year. https://news.ycombinator.com/item?id=32006791 |
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