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The option referring to passive solar techniques is the most relevant technology for reducing domestic hot water needs. Passive solar techniques utilize building designs and materials that naturally absorb, store, and distribute solar energy to maintain comfortable temperatures within a home, while minimizing the reliance on traditional water heating systems. This can significantly reduce the demand for domestic hot water by harnessing the sun's energy for heating water, making it an efficient and sustainable choice.

In contrast, active heating systems typically involve mechanical devices and may still rely on traditional energy sources, thus not directly contributing to the reduction of hot water needs. Conventional boilers function as a traditional method of heating water, but they do not inherently reduce the need; they simply provide hot water as required. Gas-fired water heaters utilize gas to heat water effectively, but their operation does not promote a reduction in hot water needs per se—they serve the purpose of fulfilling those needs rather than minimizing them. Passive solar techniques stand out in their ability to lessen overall energy demand by optimizing natural energy sources.