The exact distance that an expansion tank should be from a water heater depends on the size of the water heater as well as the capacity of the expansion tank. Generally speaking, however, it is recommended that expansion tanks be mounted at least a few feet away from the heater, but preferably no more than 8 feet away.
If the heater is in a confined space, like a closet, it is best to mount the expansion tank on the wall outside of the closet, or even outside of the house if possible.
Most codes and manufacturers have specific recommendations regarding proper installation. If a water heater and an expansion tank are both part of the same system, then the expansion tank’s capacity should be the same or greater than that of the water heater.
This is to ensure that the system is able to handle the increased pressure that may occur as the water is heated.
The best way to ensure that the expansion tank is installed properly and is the appropriate distance from the water heater is to follow the instructions from the heater’s manufacturer and comply with any local codes regarding expansion tanks.
Does an expansion tank go on supply or return side?
The expansion tank should be installed on the cold water supply side of the water heater, just after the shutoff valve. The installation is important to ensure that no water passes through the tank in either direction.
The tank will help accommodate the thermal expansion of the water created when the hot water heater is in operation. It also helps to protect the water heater and plumbing system from extreme water pressure changes caused by thermal expansion.
Installing the tank on the return side won’t provide any benefit, as the cold water is already under pressure when it is entering the water heater.
What happens if you put an expansion tank on a hot water side?
If you put an expansion tank on the hot water side of a closed-loop hydronic system, it will serve two main purposes. First, it will absorb excess pressure and act as a cushion when the hot water expands due to temperature changes.
This helps prevent damage to pipes, valves, and other components. Secondly, it will act as a collecting chamber for air and dissolved gases that are generated as a result of temperature changes, and will then release those gases when the temperature decreases again.
An expansion tank on the hot water side provides an extra level of protection to help ensure the system runs smoothly and efficiently.
Where is the expansion tank normally located?
The expansion tank is normally located close to the hot water tank and the central heating boiler, although this is not always the case. In larger properties and commercial premises, the tank may need to be located further away, as it receives cold water from other areas and must be able to handle fluctuations in water pressure.
Expansion tanks are usually located in a basement, attic, or an area adjacent to the boiler, and are usually clearly marked with a label. The tank must be firmly secured to ensure that it does not move during the operation of the boiler.
It is important to remember that the tank is under pressure and should not be opened, as this could potentially cause an accident.
Should expansion tank be mounted upside down?
No – an expansion tank should never be mounted upside down. Most expansion tanks are designed to collect water toward the upper side of the tank, so mounting it upside down would cause any collected water to rapidly leave the tank and can cause serious damage to any water-based heating systems.
Expansion tanks are made with a diaphragm or bladder inside them to separate the air from the water. If the tank is mounted upside down, that diaphragm may become damaged or fail, causing the air pressure inside the tank to become incorrect, reducing the efficiency of the system.
Additionally, the water connection at the bottom of the tank should always be pointed down so that all the water collects there, so mounting upside down could cause water to not be collected properly and lead to system issues.
Bottom line- always mount an expansion tank the right way up!.
Can an expansion tank be too big?
Yes, an expansion tank can be too big. The size of an expansion tank needs to correspond to the water heater and water system size, otherwise the water heater may not run correctly and could even be damaged.
If an expansion tank is too big, it may result in insufficient pre-charge in the tank due to an over-abundance of air. This could be caused by incorrect calculations when sizing the tank or other factors such as the tank being placed too far from the water heater.
If this occurs, the water heater does not provide adequate protection against thermal expansion, and can cause water pressure to become too high and damage the system. To ensure proper sizing and operation of the expansion tank, consult a professional and have them check for any sizing discrepancies before installation.
Will an expansion tank increase water pressure?
An expansion tank is not typically used to increase water pressure in a plumbing system. Expansion tanks are installed in a closed plumbing system to absorb the expansion of water when it is heated, while also reducing the pressure on other components in the system, such as valves and fittings.
If a pressure booster pump is installed in the system, it will increase the water pressure to the desired level. Expansion tanks are then used to control the pressure in the system by absorbing the excess pressure and reducing shock when water supply is turned on or off.
It is important that the expansion tank is sized properly to match the size of the pump, because an undersized tank might not be able to handle the pressure from the pump and cause water to be expelled from the tank.
Which way up should an expansion vessel be fitted?
When fitting an expansion vessel, it is important to ensure that it is installed the correct way up. The correct way up for a standard expansion vessel is to have the air inlet at the top and the outlet at the bottom.
This is because the air that enters the vessel through the inlet needs to be able to cushion and displace the water as it heats up and expands. Having the inlet at the top ensures that the air is in the right position to do this.
If the vessel is installed the wrong way up, then air may not be able to flow into the vessel properly, resulting in the vessel not working correctly.
Does a pressure tank need to be upright?
Yes, a pressure tank does need to be in an upright position to ensure that it works properly. If a pressure tank is not in the proper standing position, then it can cause several problems such as an uneven distribution of water, an inconsistent flow rate, and an increased risk of pressure tank malfunction.
Additionally, if the water remains in the tank for an extended period of time, then it can lead to sediment buildup and corrosion inside the tank. In order to prevent these problems, a pressure tank should always be kept in an upright position with the valve, pipe, and outlet positioned correctly.
Why are expansion tanks held at top?
Expansion tanks are water containers with a maximum capacity, held at the top of the water system, that allows water to freely expand and contract due to changes in temperature and pressure. They are normally connected to the cold water supply in a pressurized hydronic heating system.
The main purpose of an expansion tank is to protect the system from any pressure imbalances that may occur due to thermal expansion. When the system is filled, the tank allows for the water to expand when heated, reducing the pressure on the walls of the boiler and preventing the system from developing high pressure and boiling.
Expansion tanks also protect against water hammer, which can occur in systems with high velocities. By holding the water at the top of the system, expansion tanks are in the best location to ensure the water can expand, reduce pressure, and be safely stored away from the heating components.
Should water tanks be elevated?
Yes, water tanks should be elevated. Elevating a water tank will ensure it remains pressurized even if a pump isn’t used. This is because the greater the height that the water is stored at, the greater the pressure inside the water tank.
This pressure is used to push the water out of the tank and into the pipes for your taps and other water outlets. Elevating the tank also reduces stress on the plumbing, as the tank will refill gradually when the tap runs and the pump is off.
This gets rid of the need for a water pump, which can be expensive to run and maintain. Finally, elevated tanks can protect against flooding, as they will be higher than the floodwaters. This can leave your water supply safe, even when the rest of the property is affected.
Does a water heater expansion tank need to be supported?
Yes, a water heater expansion tank should be supported. Expansion tanks are designed to help prevent water hammer and thermal expansion caused by changes in the water pressure and temperature inside your water heater.
When pressure or temperature changes occur, the internal bladder inside the expansion tank will expand and contract, putting pressure on the tank itself. To ensure the tank and its components, such as the bladder, remain undamaged, it needs to be supported properly.
Depending on the size and type of expansion tank, you may need a wall- or ceiling-mounted bracket. Additionally, expansion tanks may need to be fixed to the wall or ceiling at the base to keep it from swaying, which can cause the internal components to suffer wear and tear.
How many expansion vessels do I need?
The exact number of expansion vessels needed depends on the size of the systems and their individual configurations. Generally, a system should include enough expansion vessels to reduce the need for frequent ventilation, and should be sized according to accepted standards and the manufacturer’s specifications.
Typically, for a domestic system, one expansion vessel would be required for each 25 KW of installed load, with a minimum of two vessels. For larger commercial installations, a system should include at least one expansion vessel for every 25 to 40 KW of system load.
For example, a 200 KW system would require either 8 or 10 expansion vessels, depending on the manufacturer’s recommendations. To ensure the system is correctly sized and configured, we recommend consulting a qualified professional and the system’s technical documentation.
Do expansion vessels need flushing?
Yes, it is important to flush expansion vessels regularly to ensure they are working correctly and correctly sizing the system. Expansion vessels are used to store water in a capacity greater than what is used in the normal system, helping to adjust for the thermal expansion of water when heated.
The vessel also helps to maintain a balanced pressure on the system.
Flushing an expansion vessel helps to remove dirt and debris that can build up in the system over time, especially if they are mounted outdoors in the open air. Flushing also helps to identify any pre-existing blockages in the system and allows for the adjustment of the pre-charge or the pressure in the system.
This helps ensure that the expansion vessel will have the correct sized bladder to provide enough water for the system as it is heated and expands. When possible and appropriate, expansion vessels should be flushed at least every few years or more frequently if the system gets a lot of use.
Can I install an expansion tank myself?
Yes, it is possible to install an expansion tank yourself. It is important to ensure that you have the necessary tools and equipment on hand, as well as enough knowledge to get the job done right. Additionally, it is important to make sure that your plumbing system is properly sized for the expansion tank.
The installation process itself can be quite involved and complicated, so it is best to make sure you are familiar with the process before attempting it yourself. A few of the tasks you will need to consider include connecting the inlet, outlet, and overflow pipes, filling the tank with water, pressurizing it, and verifying the system’s operation.
Additionally, many local jurisdictions require a plumbing permit for any installation or change to the home’s plumbing system, including for installation of a new expansion tank. So it is important to make sure you check your local building codes and obtain the necessary permit before proceeding.