this post was submitted on 19 Jun 2025
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In Finland if it takes more than 8 seconds for hot water to reach the furthest faucet then you're required by building code to have hot water circulation.
that makes sense, in Finland’s climate, heat lost out of the pipes is not wasted – it would heat the dwelling. not a big deal compared to dumping 20 wasted litres down the drain for every shower.
It's not just to save water. It's to prevent bacteria from growing. It doesn't grow well in cold water nor in hot water but it loves warm water.