Skip to Content

Can you use an expansion tank with a tankless water heater?

Yes, you can use an expansion tank with a tankless water heater. Expansion tanks are helpful in maintaining pressure within the home’s water heater and plumbing pipes, which helps to ensure that your system remains in good condition.

Expansion tanks essentially capture any excess water pressure in the system and release it when necessary. This helps to prevent potential water damage, by reducing the amount of pressure exerted on your pipes and water heater unit.

An expansion tank can be used with any type of water heater, including tankless heaters. In the case of a tankless water heater, it helps to counteract the large changes in pressure that occur when the hot water demand suddenly increases in the system.

This ensures that your pipes and water heater remain safe by avoiding any dramatic pressure changes. It is important to note that the size and specific installation of an expansion tank will depend on the type of water heater you have and the local plumbing code requirements in your area.

For this reason, it is best to consult a professional plumber if you are thinking of adding an expansion tank to your tankless water heater.

Can I replace my 40 gallon water heater with a tankless water heater?

Yes, you can replace your 40 gallon water heater with a tankless water heater. Tankless water heaters heat water on demand rather than storing and heating a large amount of water like standard water heaters do.

Tankless water heaters are usually more efficient and cost-effective due to their lack of storage tank and their ability to only heat water when it is needed. Replacing your 40 gallon tank with a tankless solution may help you save on monthly energy costs, improve the efficiency of your hot water system, and save space.

When considering a replacement for your water heater, it is important to understand the water needs of your home. Tankless water heaters provide a continuous flow of hot water, but there is a limit to how much hot water can be supplied at one time.

If more than one person is using hot water simultaneously, or if you need to run a large appliance like a hot tub or washing machine, you may need to invest in a tankless system with a higher flow rating.

It is also important to consider the size and type of fuel source you’ll need for the tankless system, as some require a larger initial investment than a standard water heater might.

An experienced plumbing professional can help you assess your water needs, help you determine what size and type of tankless water heater you will need for your home, and ensure the installation is done properly.

What happens if you oversize a tankless water heater?

If you oversizing a tankless water heater, you could end up with an excess of hot water that is not being used. This may result in increased water and energy costs as the tankless water heater works to maintain high temperatures, even when you don’t need it.

Additionally, because tankless water heaters are designed with a certain temperature increase in mind, oversizing could lead to hot water that is too hot for comfort use or that may exceed what is safe for washing dishes or laundry.

Furthermore, some plumbing systems may not be able to handle the pressure of such an excess of hot water, leading to additional costs in repairs or even replacements. Finally, it’s important to note that oversizing a tankless water heater could void the warranty on it.

Ultimately, when considering a tankless water heater, it’s important to understand your specific water needs, the limitations of your plumbing system and the recommended temperature increases for your specific system.

Having an oversized water heater is not only inefficient, it could end up costing you more in the long run.

Do expansion tanks need to be upside down?

No, expansion tanks do not need to be upside down in order for them to work correctly. The orientation of the expansion tank does not affect its performance and therefore does not need to be a consideration for installation.

Expansion tanks are designed to operate in any orientation, making installation and maintenance much easier. An expansion tank is typically mounted near the top of the hot water header and connected to the hot and cold water lines.

The most important consideration when installing expansion tanks is making sure they are securely mounted and the connections are sealed properly. This is especially important if the expansion tank is mounted in an area that is subject to seismic activity or heavy vibration.

Should you drain your expansion tank?

It is not usually necessary to drain your expansion tank, however it is important that it is checked regularly. Expansion tanks are typically located near the water heater and perform an important role in managing the water pressure inside a hot water heating system.

The purpose of an expansion tank is to maintain an even water pressure, provide an air cushion to prevent waterlogging, and prevent thermal expansion of water in the pipes. If the expansion tank is not working properly or there is too much water pressure in the system, it can result in problems such as noisy pipes, waterlogging, and eventual pipe damage.

It is important to check the expansion tank, especially if the water pressure in your home suddenly increases or decreases. This could indicate a problem with the expansion tank. To check the expansion tank, open the valve on the top and check the amount of water inside.

If the water level is too high, it will need to be drained or replaced. If the water is too low, it will need to be refilled. In either case, it is best to consult a qualified plumber for assistance, as attempting to repair an expansion tank improperly can lead to greater damage and problems.

How far away from a water heater can you install an expansion tank?

The minimum recommended distance from a water heater to an expansion tank is two feet. However, it will depend on the specific make and model of the expansion tank. Some expansion tanks may require additional clearance depending on the material they are made out of and their size.

Generally, the larger the expansion tank, the farther away it should be installed. It is also important to make sure that any necessary valves and fittings may have sufficient access and space to be operated properly.

If a different size or style of expansion tank than what is recommended for the water heater is used, it’s best to check the manufacturer’s instructions for specific clearance requirements. Additionally, some local building codes may also require specific distances for installation.

It is important to ensure that all of these requirements are met in order to ensure that the system operates correctly.

What can I use instead of a expansion tank?

An expansion tank is an important component of a closed water heater and hydronic (boiler) system, as it helps to manage the volume of water expansion that can occur during the heating process, keeping the pressure and temperature within safe limits.

Without an expansion tank, the pressure of the hydronic system or water heater could eventually become too high, leading to failure of the equipment. As such, a direct alternative to an expansion tank is not typically recommended.

Instead, other methods to reduce the pressure in the hydronic system or water heater should be used. These include setting the temperature of the water heater or checking the pressure on the pressure relief valve.

In addition, the water pressure in the home should also be monitored, as it should typically remain below 80 psi. If the water pressure is too high, you may need to install a pressure reducing valve at the point of entry to the home.

Finally, regular maintenance on the hydronic system or water heater should also be performed, including flushing and draining the tank, and inspecting the anode rods and any other components.

What happens if expansion tank is too big?

If an expansion tank is too large, it can cause a number of problems. Firstly, as the water cools, it may not be able to raise the pressure in the tank to the recommended levels. This will cause an overall reduction in system efficiency due to energy loss.

The expansion tank will also be unable to absorb the thermal energy generated by the system, leading to limited safety and efficiency. In addition, the tank will not be able to accept the expanded water from the system when the system is heated, leading to overflowing and pressure build up in the system, resulting in water damage and possibly even bursting pipes.

Finally, larger expansion tanks may require more frequent maintenance and inspection, and larger space for installation, which can be costly.

Can PEX support expansion tank?

Yes, PEX can support an expansion tank. PEX is an ideal material for an expansion tank as it offers several benefits including durability, flexibility, cost-savings, and ease of installation. PEX is not affected by corrosion which makes it more reliable and durable than traditional materials.

Additionally, its flexibility can help streamline the installation process and make it easier for a plumbing contractor to access tight areas and make connections. Also, by not having to replace or repair joints, fittings, and connectors, PEX can potentially lead to cost-savings over the lifetime of the system.

Therefore, PEX is an ideal material to use for an expansion tank.

Do tankless water heaters need overflow pipe?

Yes, tankless water heaters do need an overflow pipe. The overflow pipe functions as a relief for any pressure that could build up in the water heater over time. When the water heater’s pressure becomes too high, the excess pressure is sent out of the overflow pipe.

Not having an overflow pipe means you won’t have somewhere for this excess pressure to go and can lead to the pressure building up and causing damage to the water heater. Therefore, it’s important to ensure that all tankless water heaters are fitted with an overflow pipe.

How do I know what size expansion tank I need?

To determine the size of expansion tank you need, you will need to know the estimated volume of water that will fill your entire closed water system (including both hot and cold water lines), and the specific pressure rating of your system.

You can typically determine the volume of water by multiplying the total linear feet of your system’s piping (including both hot and cold water lines) by 0. 5 gallons per linear foot. To ensure you select an expansion tank with the correct pressure rating, you must know the maximum allowed pressure of your system, which is typically outlined in the diagram or handbook for your specific plumbing system.

Once you have these two parameters, you can then compare your estimated volume of water against the pressure ratings for different types of expansion tanks and select the one that best fits your needs.

Does the size of an expansion tank matter?

Yes, the size of an expansion tank does matter. Expansion tanks are designed to hold pressurized water from a hot water heater and to maintain system pressure. Expansion tanks provide a cushion for the increasing water volume created when water is heated in the tank and releases pressure as the water cools.

In most cases, the volume of an expansion tank is 60 gallons or less, unless it is used in a commercial application. It’s important to choose the right size of expansion tank to fit the water heater in order to ensure the system operates properly.

If the expansion tank is too small, the water heater can become over pressurized, possibly leading to damage of pipes or the water heater itself. On the other hand, if the tank is too large, it can become a reservoir of unused water which can cause pressure spikes in the water system.

In order to determine the size of the expansion tank for a given water heater, the volume of the tank should be multiplied by the Maximum Working Pressure (MWP) on the tank’s data plate. The tank should also be sized according to the volume of the water heater and the pressure range it is designed to maintain, as well as the area’s water pressure and temperature.

A professional plumber is the best person to help you determine the right size expansion tank for your particular water heater.

Will a bigger expansion tank increase water pressure?

No, a bigger expansion tank will not increase water pressure. Expansion tanks are designed to help regulate the pressure in closed water systems. Pressure in a closed water system is determined by the draw from the outlets, the size of the pump, and the size of the pipes.

The expansion tank simply helps to absorb the pressure variations due to thermal expansion and the change in water volume that can occur in the system. If the water pressure is low, you may need to look at increasing the pump size, expanding the piping, or replacing plumbing components that could be at fault.

Can I install an expansion tank myself?

Yes, you can install an expansion tank yourself, however it is recommended that you consult a professional prior to doing so. Expansion tanks are an essential component of your home’s plumbing system, and can help protect against high water pressure and tankless water heater malfunction.

Instituting an expansion tank helps to maintain the balance between water pressure and flow rate.

Before you attempt this project, you should familiarize yourself with the tools and materials needed, as well as the process to install the expansion tank. This includes obtaining and identifying the correct size, the correct materials, and the correct location.

The expansion tank must be installed directly into the cold water line before the water heater, and should be secured and sealed properly. Furthermore, it is important to follow all safety procedures and safety regulations before beginning your installation.

In summary, while it is possible to install an expansion tank yourself, it is always a great idea to acquire the services of a licensed plumbing professional prior to attempting any type of installation.

Doing so can help ensure that your project is completed safely and correctly.

What is the most common expansion tank?

The most common expansion tank is a bladder type. A bladder type expansion tank is designed with a flexible inner bladder that stores the expanded water and separates it from the compressed air in the tank.

The bladder holds the water while providing an air cushion that keeps the water pressure from exceeding its highest safe level. This type of expansion tank is extremely versatile, low cost, and can be used in nearly all closed system hot water heating applications.

It is also often the type of expansion tank used in domestic water systems in many countries around the world.