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We have an apartment in the var we rent in the summer, and each end of the season we empty the cumulus.or it seems that it is not a manipulation to do because it dries the joints. I would like to know exactly what it is

For my part, I think it is totally useless to drain an electric water heater by accumulation when one is absent for a long time. I would put only two caveats: if the site exposes it to frost and if the water is very soft, which makes it corrosive. Personally I never drain my water heater from a second home, not far from home for that matter... and it works perfectly since... more than 20 years.

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