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<dt>Variable capex</dt><dd>If this system is installed in a building, this capacity-related capital cost is paid per kW of peak demand in the building.</dd>
<dt>Tank factor</dt><dd><p>
THERMOS' default peak demand estimates include hot water demand, which makes up most of the peak. This is because heat networks typically provide hot water direct through the heat exchanger, rather than by charging a storage tank.
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However, some individual systems do use a hot water tank, and so require a lower 