Water expands when heated and creates excess pressure in a standard water heater, which can stress the pipes and fixtures in a closed plumbing system. High pressure can damage the water heater, supply pipes, and plumbing fixture valves. As most modern homes have closed plumbing systems, some safety mechanism is required to protect the water heater and overall plumbing system from experiencing severe damage.
WHAT IS A THERMAL EXPANSION TANK?
A heater’s thermal expansion tank is a safety device to manage the extra pressure created due to thermal expansion when the heater is in operation. It works as an overflow receptacle where the additional volume created by heated water rushes, lowering the pressure inside the water heater. Some water heater manufacturers can even void the unit’s warranty if a closed plumbing system lacks an expansion tank for the water heater.
A water heater thermal expansion tank is a small tank attached to the water heater’s water supply pipe. Absorbing the extra pressure, it protects the water heater from premature failure and excessive damage. A thermal expansion tank also helps prevent excessive scale or residue buildup, which can lead to clog issues. Therefore, an appropriate thermal expansion tank is crucial for water heating systems operating in a closed loop to restrict pressure within safe limits.
HOW A THERMAL EXPANSION TANK WORKS
A thermal expansion tank has a pressurized air bladder that expands and contracts to absorb the additional water. As the water heats, it increases the pressure. However, the excess pressure flows into the expansion tank, compressing the air instead of increasing the pressure in the water heater or the plumbing. After the expansion stops, the compressed air pushes the water back. A thermal expansion tank only houses overflowing water and does not hold water permanently.
REASONS TO HAVE A THERMAL EXPANSION TANK
ENSURE SAFETY
The biggest reason to install a thermal expansion tank is to add an extra security layer to prevent issues like tank explosion. The thermal expansion tank is a safety device that prevents excess pressure from creating hazardous scenarios.
IMPROVE EFFICIENCY
An expansion tank can boost the existing water heater’s efficiency. It reduces the pressure fluctuations within the system and uses less energy to operate. It allows the water heater to work more efficiently and lower energy bills.
PROLONG WATER HEATER LIFE
A thermal expansion tank keeps the water heater running smoothly and protects it from damage. It protects the unit from being under constant stress or experience damage due to increased pressure. An expansion tank extends the water heater’s life by relieving the extra pressure.
PROTECT THE PLUMBING
The thermal expansion tank avoids leaks, corrosion, pipe bursts, or water damage due to excessively high pressure. It also helps save on costly repairs or water heater replacement.
MEET LOCAL CODE REQUIREMENTS
Some city or building codes mandate a water heater thermal expansion tank. Installing one protects the water heater and ensures the plumbing is up-to-code.
A thermal expansion tank is a wise investment to prevent costly damage to the home plumbing systems. Contact a local water heater professional to determine the need for one and ensure its correct installation.
Water Heater Pros provides water heater installation and replacement services for Las Vegas and surrounding area residents and businesses. Our expert technicians install both traditional and tankless water heaters for homes and other buildings with gas or electric service. We offer the highest quality installers for efficient, versatile water heaters such as Rheem. Ruud, high-efficiency tankless Navien units, and more. Ask about our installation specials.