To support a water heater expansion tank, it must be supported by something other than the piping, typically using a bracket or strap.
Proper support for an expansion tank is crucial during installation to prevent stress on the water piping system. The tank's weight, especially when full of water, can exert significant leverage if only connected by plumbing fittings.
Why Proper Support is Essential
- Prevents Stress on Piping: The weight of the tank can strain pipe joints and fittings, potentially leading to leaks over time.
- Ensures Stability: A supported tank is less likely to move or vibrate, contributing to a more secure and durable plumbing system.
- Meets Code Requirements: Plumbing codes often mandate that expansion tanks be properly supported independently of the piping.
Methods for Supporting an Expansion Tank
Based on installation guidelines, the tank needs external support. Common methods include:
- Using a Wall Bracket: This is a popular and secure method. A metal bracket specifically designed for expansion tanks is mounted to a nearby wall stud or sturdy structural element. The tank then rests on or is secured to this bracket.
- Using a Strap: A heavy-duty strap can be used to secure the tank to a vertical surface or overhead structure. This method is often used when a standard bracket isn't feasible.
- Integrating Support with the Piping System (with a Bracket): While the piping alone cannot support the tank, some installation kits include a bracket that attaches to the tank and the pipe, then secures the entire assembly to a wall or joist, ensuring the wall carries the load.
Key Point: The support mechanism (bracket or strap) is what bears the tank's weight, not the connection to the pipe itself.
Proper Placement for Installation
Beyond support, correct placement is also vital for the expansion tank's function and longevity:
- Location: The tank should be installed between the water heater shutoff valve and the inlet for the water heater.
- Temperature Side: It should not be installed on the hot water outlet side of the heater. Install it on the cold water inlet side.
- Distance from Inlet: Position the tank approximately 18 inches from the water heater's inlet connection.
Following these guidelines ensures the expansion tank is supported correctly and located optimally within your water heating system.
