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I think there's a saturated solution of sodium acetate inside. The metal clickie causes the solution to crystallize, which happens to happen exothermically.

(IANAchemist)

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Can I use sodium acetate to heat my energy passive home (which I will build soon) by heating it at day in Trombe wall and discharging it at night?

It's most likely unwieldy. Sometimes you can cause the exothermic effect to occur without you wanting it by a vibration or shock.

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