The Thermal Expansion Relief Valve can replace a water heater expansion tank because it functions similarly. Both products absorb the excess pressure in the plumbing system created by thermal expansion. As plumbers know, the expansion tank equalizes pressure throughout the plumbing system by providing a space for hot water to flow into. Without an expansion tank, pressure would be distributed to the entire plumbing system, straining it and decreasing its lifespan.
Like an expansion tank, the new Thermal Expansion Relief Valve also takes the load off your pipes by:
Common Expansion Tank Problems
While expansion tanks are required by code in most closed-loop water heater systems, they have a reputation for failing. Common expansion tank issues include:
For more info contact Pressure Vessel Supplier or call us at +971 4 252 2966.
When the water heated it gets expanded, the excess pressure inside the water heater tank needs to be released. In the past, the expanding water in the tank would simply drain back out into the municipal water supply where it came from. Today, the water main is designed to prevent the backwards release of pressure, known as backflow, by employing a check valve. The check valve prevents waste water from inside the house returning to the water supply where it can contaminate the supply of fresh water.
A water heater expansion tank is another small tank that is attached to the water supply pipe of the water heater. The expansion tank is designed to handle the thermal expansion of water as it heats up in the water heater, preventing excessive water pressure. If water pressure gets to high it can damage valves in plumbing fixtures, joints in supply pipes and the water heater itself. Expanding water from the water heater flows into the expansion tank, relieving water pressure in the system.
What if my water heater doesn’t have an expansion tank?
Most homes that have a check valve on the water main do not have an expansion tank, since it wasn’t required until recently. This may or may not cause excessive pressure buildup, depending on the specific design of the plumbing in the house.
If you are noticing that washers in plumbing fixtures are deteriorating rapidly, or water is dripping from the relief valve on the water heater, it may be wise to add an expansion tank. It can be low-cost insurance against more costly damage to your home’s plumbing system.
For more info contact pressure vessel supplier in dubai or call us at +971 4 252 2966
If you have a hot water boiler system (not a low-pressure steam boiler - there is a huge difference between the two) or a chilled water system (not many chilled water systems in residential but I have seen them) then you have a closed loop piping system that runs to either convectors, radiators, or a coil or two somewhere in the system where the main heat exchange process takes place. That is a closed loop where the water runs to these convectors or coils to provide heating or cooling. Furthermore, it is important to maintain the proper pressure inside that closed-loop piping system — an expansion tank helps to maintain the proper pressures in the loop.
Inside this piping is water (sometimes a water/glycol mix but that is mainly in commercial applications), and when water heats and cools down, it expands and contracts. Furthermore, the piping system, along with the parts of the boiler or chiller that has water, cannot handle this expansion and contraction with breaking or busting open. Therefore in every hydronic system, there is an expansion tank to handle this expansion and contraction. Furthermore, an expansion tank is a shock absorber that absorbs this expansion and contraction of the volume of the water.
It is critical that expansion tanks receive periodic maintenance. Ffurthermore, for bladder-type expansion tanks maintenance should include:
Does the expansion tank have to be installed on the cold side?
Although expansion tanks can be installed on the hot side, we strongly recommend they be installed on the cold line, downstream of the shutoff valve.
Where should an expansion tank be installed in relation to the hot water heater?
Your expansion tank can be anywhere on your plumbing system and does not need to be installed in close proximity to the water heater. It is most commonly installed using a “T” at the cold inlet to the water heater. But, functionally, it can be installed anywhere on the cold inlet line.
Can the expansion tank be installed at any angle?
The expansion tank can be installed at any angle. This will conflict with info that comes with any expansion tank you buy at a retail store. The installation instructions that come with retail expansion tanks say the tank must be installed in a hanging vertical position.
When you choose a retail expansion tank, it comes with a “Saddle Fitting.” This allows you to avoid soldering and makes installing an expansion tank simpler for the average person. The saddle fitting simple clamps onto the pipe, and it comes with threading that allows you to attach the tank.
First, you drill a small hole in the existing pipe. Next, the clamp is secured so that the hole aligns with the inlet for the expansion tank. While this is one option, we don’t recommend these fittings for several reasons. They only allow the tank to be placed in one position (vertical), and they are unreliable.
Instead, we recommend soldering the proper fittings into the system or the use of galvanized fittings.
How to know if you need a water heater expansion tank replacement
Your expansion tank is a vital part of your home’s plumbing and water heating system. While a traditional water heater might last 10-15 years, your expansion tank could fail before this point. First, you can extend the life of your expansion tank through proper installation that ensures the air pressure in the tank matches the water pressure in your home.
You can prevent a costly accident by periodically inspecting your expansion tank. If you see dripping water under the tank or near the fittings, the valve might be blocked. This can happen due to debris, such as mineral deposits.
You should also have a mechanism in place to check the pressure, such as a water pressure gauge, that can tell you if the tank is functioning properly or if the diaphragm has been damaged. A water heater expansion tank can often be replaced without having to replace your entire system.
For more info contact Pressure Vessel Supplier in UAE or call us at +971 4 252 2966
What is a Water Heater Expansion Tank?
A water heater expansion tank is an additional small thank that is attached to your water heater unit. It is designed to handle that excess water that builds up. So, when the water pressure gets too high, it will flow into your expansion tank instead of damaging your home’s plumbing valves, fixtures, and joints, and potentially causing a burst line with immeasurable damages and cost.
When your water thermally expands, a water heater expansion tank prevents unwanted increases in pressure. Water expands by roughly 2% as it heats up from 50° F to 120° F.
You install the expansion tank down the line from the inlet valve that sends hot water into your home. The tank has two sections that are separated by a rubber valve. Water flows through the top portion, and there is pressurized air in the bottom.
It’s this air pressure that allows the tank to absorb the excess pressure from your water heater, which keeps it away from your home’s other systems.
Who needs a water heater expansion tank?
If you have a “closed system,” meaning there is a backflow preventer or other device that won’t’ permit your water to flow back into the main water supply, thermal expansion will lead to significant pressure increases in your home’s plumbing system.
Not only should you have a thermal expansion tank under these circumstances, but some municipalities require it. Further, your water heater’s manufacturer might void your warranty if you have a closed system and fail to get this safeguard.
You don’t need a water heater expansion tank if you have a tankless water heater since there is no tank and no buildup of pressure. Likewise, if your home runs on an open water supply system, where excess water goes back into the municipal water supply, it won’t place any strain on your home’s plumbing system.
Common questions about water heater expansion tanks include:
What is a check valve?
The check valve is the mechanism that prevents the backflow of thermally expanded water in the wrong direction. Without an expansion tank, the increased pressure can cause unnecessary stress on your plumbing fixtures, including the water heater, and cut down on their working life.
For more info contact Pressure vessel supplier or call us at +971 4 252 2966