Since air is highly compressible, high pressure is not created. In the past, expanded water was allowed to push its way back into water lines leading to the home. To avoid contamination of public water supplies from back flow of potentially contaminated water, codes have been adopted which require that a back flow device be installed on incoming water lines. This creates a closed system, a system that has nowhere for expanding water to go. The best solution is an expansion tank.
Expansion tanks are easy to install and are maintenance free.
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