Yes, you truly need an expansion tank if your home operates on a closed plumbing system—meaning your incoming water supply features a pressure-reducing valve (PRV), backflow preventer, or dual-check valve. When water is heated, it expands in volume. In closed systems, this expanding water has nowhere to go, creating extreme pressure spikes that can rupture your water heater tank, damage pipe joints, and cause continuous T&P relief valve discharge, making the expansion tank a critical safety and code necessity.
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