Skip to Content

Where do you install a potable water expansion tank?

A potable water expansion tank should be installed in the cold water line, after the shut-off valve, but before the water heater. This will ensure that any pressure increase in the potable water line is absorbed by the tank, instead of delivered to the pipes, fixtures, and appliances in the home.

It is important to ensure the tank is located in an area where it can freely expand and contract with temperature changes, as it will contain air and water. The tank should be mounted securely to the wall near the water heater and the inlets and outlets should be pointed down for proper drainage.

If the water system contains a check valve, that valve should be installed after the water expansion tank. It is also a good idea to install a shutoff valve after the expansion tank as well, as this makes servicing and maintenance of the tank much easier.

Where should an expansion tank be installed?

An expansion tank should be installed in the highest point of the domestic hot water system, as it provides sufficient space for the expanding hot water to be safely collected as it cools. It is important to install the expansion tank as close as possible to the hot water source, to reduce the volume of water that needs to be pumped to the expansion tank.

Installing the expansion tank near a drain line or close to the existing pressure relief valve also helps with maintenance. It is also important to ensure that there is sufficient space above and around the expansion tank to allow for any servicing that may be needed.

Additionally, the expansion tank should be installed on a sturdy wall, to ensure its effective operation.

Does an expansion tank go on supply or return side?

An expansion tank is designed to attach to either the supply or return side of a hydronic system. The tank is typically filled with an inert gas, typically nitrogen or air, which acts as an accumulator for extra thermal energy when the system pumps into it.

The pressure of the gas inside is determined by the system, which is typically based off the pressure required to fill the tank, as well as other calculations. Ultimately, the location of the tank on the supply or return side is based on the requirements of the specific system and the engineer who designs the system.

In some cases, two expansion tanks may be necessary, one located on the supply side, and one on the return side.

How far can a expansion tank be from a water heater?

The distance from an expansion tank to a water heater depends on several factors, including the water heater size, the piping layout, and the pressure of the water. Generally speaking, an expansion tank should be positioned at least 18 inches, but no more than 6 feet, away from a water heater.

This distance should be taken into account when designing a plumbing system and the appropriate size, type, and location of the expansion tank should be determined to provide an optimal installation.

Additionally, since an expansion tank is essentially acting as a reservoir or accumulator for changes in volume and temperature of the system, the pressure of the water must also be considered to ensure sufficient operation of the expansion tank.

Where does the thermal expansion tank go?

The thermal expansion tank should be installed in the cold water supply line of the water heater, typically on the top or side of the unit. The tank collects the excess water produced when the water is heated, preventing pressure build-up within the system.

It may also provide protection against bursts due to excess pressure and will help regulate the temperature of the water heater. It is important to ensure that the tank is installed properly and that all of the necessary components are in good working order.

Additionally, the tank should be placed at least 18″ above the water heater to ensure that the rate of expansion is correctly measured.

Why is expansion tank on the cold water line?

An expansion tank is designed to protect the hot water system from pressure build-up. All hot water systems use a closed-loop system, where the water circulates through the pipes and hardly ever gets replenished.

In this closed-loop system, the water is heated, expands, and takes up more room than it did originally. An expansion tank is installed on the cold water line of the hot water system so that the water that has been heated and expanded can be stored.

The tank is filled with air and water, and the air absorbs the extra pressure created by the expanding water. The air in the tank will expand and contract as the water levels rise and fall, preventing any unnecessary pressure build-up in the pipes.

That’s why an expansion tank is installed on the cold water line of the hot water system.

How close does an expansion tank need to be?

When installing an expansion tank, it is important to make sure that it is placed close enough to the boiler or hot water heater so that it can fulfill its function – that is, to act as a pressure relief valve in the event of thermal expansion of the water system.

Generally speaking, an expansion tank should be located as close as possible to the appliance that it is protecting and housed in a location that is easily accessible. If the water heater or boiler is on the upper floors of a building, the expansion tank should be placed higher than the highest point of the system so that the pressure of the system can be measured and regulated.

With regard to the specific placement of the expansion tank, it will typically require mounting via a bracket to the wall or joists, or elevation on a wood block, with a clearance of at least six inches from combustible materials.

If possible, the tank should be placed in a vertical position, as this is the most effective way to provide the necessary pressure regulation. Furthermore, the expansion tank should be hooked up to the water system via flexible connections, such as braided hose, that will allow for natural movement without stressing the connections.

Why do expansion tanks explode?

Expansion tanks can explode when they become overfilled with fluid, particularly a closed system where the liquid expands with rising temperature. This can be avoided with periodic inspections and maintenance of the tanks.

Explosion usually occurs when the tank pressure exceeds the safety limits that have been set by the manufacturers. When this happens, the pressure relief valve opens up in order to bring the pressure down but is unable to do so, as the tank continues to fill up.

This causes the tank to rupture, with the heat and pressure of the rise in fluids causing a violent explosion. An additional cause of tank explosions is when the internal pressure of the tank exceeds the system differential pressure.

This can be caused by faulty pressure-control valves, a sudden change in the system temperature (caused by a power surge or other factor) or a faulty safety valve. Proper maintenance and monitoring of the system and its components can help to avoid explosions.

Where should pressure tank be located?

Pressure tanks should be installed in accessible locations so that they can be inspected, maintained, and serviced. Generally, they should be installed in an indoor environment that is dry, well-ventilated, and away from any sources of heat or combustible gases.

Moreover, it is important to properly secure the tank to ensure that it does not move and cause any potentially hazardous spills or leaks. Finally, it is important to check with local building codes to ensure that the pressure tank is located in accordance with all safety regulations in your area.

What happens if you don’t install an expansion tank?

If an expansion tank is not installed, the pressure from the expansion of heated water can cause serious damage to a hot water system. Without an expansion tank, the pressure in the hot water system builds up to an excessive level and can rupture pipes, gaskets, seals and water heaters.

The additional pressure can also force water out of the relief valves, reducing the overall efficiency of the system and wasting water. In extreme cases, without an expansion tank, the pressure can cause the valves, seals, gaskets and water heaters to fail and create a dangerous water leak inside the walls or ceilings of a house.

Additionally, the pressure can also force air into the system and make it ineffective. Installing an expansion tank is essential to keep the hot water system operating at maximum efficiency.

Does expansion tank go before or after circulator pump?

The placement of an expansion tank relative to the circulator pump will depend on the particular setup of your plumbing system. Generally speaking, expansion tanks are typically installed after the circulator pump, after the hot water heater and other fixtures.

This allows the pump to pass through hot water from the water heater to all other fixtures, which causes the pressure to build up and push the water back to the water heater and to the expansion tank.

The expansion tank helps to absorb that pressure and prevents damage to the pipes. Expansion tanks also help to regulate temperature, so placing them after the circulator pump allows them to maintain the optimal temperature before the water is distributed throughout the house.

In some cases, such as systems with a secondary loop, the expansion tank may need to be installed before the circulator pump to maintain appropriate levels of pressure. If you’re not sure where to place your expansion tank in relation to your circulator pump, it’s always best to consult with a professional plumber to ensure optimal performance and proper protection for your plumbing system.

Does it matter which way an expansion tank is installed?

Yes, it does matter which way an expansion tank is installed. Expansion tanks are specifically designed to control the pressure in hot water heating systems that use a closed loop system. A correctly installed expansion tank allows for the system to absorb an increase in pressure due to thermal expansion.

If the tank is not set up correctly, the pressure it allows for either falls below or rises above an acceptable level. Moreover, the tank’s air bladder must be correctly inflated or it will not work.

If too much air is pumped in, it will prevent water from entering the tank and will not allow it to absorb the system’s extra pressure. Likewise, if it is underinflated, the system will become overpressurized.

Additionally, the expansion tank’s orientation matters, as it must be installed so that the water intake line is at the bottom. If not, the tank may not allow the necessary amount of water to enter, thus preventing it from operating at its full potential.

What are the two types of expansion tanks?

There are two types of expansion tanks that can be used in hydronic systems: air-over-water and pre-charged bladder tanks.

Air-over-water tanks are the most common type of expansion tank used in hydronic systems. These tanks contain both water and air, with the water acting as a cushion for the system. They are usually larger than pre-charged tanks, making them ideal for larger hydronic systems.

They also require very little maintenance.

Pre-charged bladder tanks are not as common as air-over-water tanks, but they are also used in hydronic systems. These tanks contain a small bladder that is pre-charged with air. The bladder prevents excessive pressure in the system and works to limit fluctuations in pressure.

It requires less maintenance than air-over-water tanks and is typically used in smaller hydronic systems.

Will an expansion tank increase water pressure?

No, an expansion tank will not increase water pressure. The primary function of an expansion tank is to provide a space for hot water to expand as it is heated without building pressure in the system.

The tank also helps prevent air from entering the system and creating small, obstruction-creating air bubbles. In some cases, an expansion tank may have a small air cushion at the top of the tank that may give a small water pressure boost, but this is not the primary purpose of an expansion tank, and is rarely seen in residential systems.

An increase in water pressure is most often accomplished by adjustment of the pressure regulator or an increase in the size of the water supply line into the home.

Can I install expansion vessel horizontally?

Yes, you can install an expansion vessel horizontally, although this is typically the exception rather than the rule. As with all plumbing installations, it is important to ensure that the vessel is not subject to any damaging vertical loads and that the fixing is suitable for the application.

Additionally, you should ensure that the vessel is fitted close to the mains water conditioner so that the effects of cold water expansion are efficiently contained within the system. You should also consider that if the vessel is fitted horizontally, the float may not operate correctly.

Therefore you will likely need to install an extra float switch in the vessel or use an additional float control mounted externally with the expansion vessel installed.