Physicist Hans Martin, Sweden, stores summer solar heat in three big water tanks underneath his house. The insulated tanks stores enough energy to heat part of the big house during most or all of the winter season, when the sunshine is sparse.
SVT: https://www-svt-se.translate.goog/nyheter/lokalt/gavleborg/hans-odlar-egna-citroner-i-delsbo-i-februari-sa-gor-han?_x_tr_sl=en&_x_tr_tl=sv&_x_tr_hl=en&_x_tr_pto=wapp

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