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Many homes built before certain plumbing codes were enacted may not have an expansion tank, as they were not a standard requirement. In older systems, open water systems allowed the expanding water to flow back into the city’s water lines. However, in most modern homes with closed water systems (due to check valves or pressure-regulating valves), this is no longer possible.

These symptoms may indicate that your system is struggling to manage the excess pressure. Installing an expansion tank provides a low-cost solution to mitigate these risks, protecting your plumbing system from costly repairs.

Potable expansion tanksizing

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A water heater expansion tank, also known as a thermal expansion tank, is a small, secondary tank that attaches to the water supply pipe leading to the water heater. To answer the question 'what does an expansion tank do,' its primary role is to absorb the extra volume created when water heats up and expands. The water heater expansion tank purpose is clear: by providing this additional space, it prevents dangerous pressure from building up in your water heater and plumbing system.

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The check valve ensures that the water inside your home stays separate from the external supply, but it also traps the expanding water within the system. Without a way to relieve the increased pressure, this can lead to damage in your pipes, water heater, and plumbing fixtures. This is where the water heater expansion tank comes into play.

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2 Aug 2023 — Hot water heating (only) boilers have only a pressure relief valve. Typically 30 PSI, some systems may be rated for 50 PSI. They do have temp limit controls.

As water heats up in a water heater, it naturally expands, a process known as thermal expansion. This expansion increases the volume of water, leading to excess pressure within the water heater's tank. In the past, this expanding water would simply flow back into the municipal water supply where it originated. However, modern plumbing systems are equipped with check valves that prevent water from flowing backward into the public supply, reducing the risk of contamination.

Potable expansion tankinstallation

The expansion tank, also referred to as a potable water expansion tank, is divided into two chambers: one filled with air and the other meant to hold water. As the water in the heater expands, it flows into the tank, compressing the air in the other chamber. This compression relieves the pressure within the closed water system. By regulating pressure in this way, the tank protects vulnerable components like:

Without this pressure relief provided by an expansion tank for water heater systems, over time, these components can fail, resulting in leaks, broken pipes, or a damaged water heater.

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If your home doesn’t have an expansion tank, you could still be at risk of pressure-related issues. Here's what you might notice:

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Mixing valves are designed to blend hot water with cold water to ensure a constant, safe outlet temperature. They are utilized in residential, commercial, and institutional applications where controlling water temperature is critical to avoid scalding, thermal shock, and Legionella growth.

Thermal expansion is a basic principle of physics. When water is heated, its molecules move faster and spread out, increasing the volume. In a confined space like a water heater, this expanded water has no room to go unless an expansion tank is present.

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Don't let expansion tank issues put your plumbing at risk. Whether you need installation, maintenance, or repairs, ABC Plumbing has you covered. Our skilled technicians can quickly diagnose and resolve any expansion tank problems, ensuring your water heater system runs safely and efficiently. Don't wait for small issues to become costly repairs. Call ABC Plumbing at (888) 868-6667 now today for prompt, professional service you can trust.

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The RMC/Flomatic Reduced Pressure Zone Device is designed to give maximum protection to the potable water supply from contamination in high hazard applications.

PT-5 2-gallon non-ASME pre-charged diaphragm expansion tank for potable domestic water systems in residential and light commercial applications.

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