When selling our house the Buyers inspector insisted we have an expansion tank installed on our HW water well system which also had a pressure tank. The expansion tank serves as a backup system to prevent overworking your plumbing. I do get the basic concept that water expands when heated. These tanks are small (1 – 2 gallons), but they can create high system pressure due to thermal expansion. Temperatures directly effect pressure in a sealed environment such as refrigeration or water system. While expansion tanks can always be added to a system, the truth is that they are only required for closed-system water heaters. Thank you for your response. The tank can be installed anywhere in the cold-water line between the … Even with the tank at 40psi, I still get a rise to 60psi when the heater is heating water. Please help me understand this. An expansion tank is installed on the water supply pipe to the water heater. An expansion tank, such as the one shown above, helps to absorb water pressure that results from thermal expansion. I rent, I do not own so I can’t make the decisions. On the other hand, if the tank is too big, it has no negative impacts on your plumbing. Am I wrong? Sorry but this is not true. A functional and high-quality expansion tank will keep your home’s pipes, fixtures, and water heating system running well … Even on the cold side with City water @ 40psi system pressure always fluctuate when you use water. 15 bladder-type tank… If a tankless heater has an integral buffer tank, a thermal expansion tank should be included in the system … More difficult I would think. Water filter installation may have or require a check valve some where, but I don't know. a very simple test. tank is hanging from the ceiling, replace it with a No. Mounting it sideways is the only way you normally don’t want to mount due to issues with supporting its weight when full. Most recommend to mount it like you have with the connection at the top (pipe above). One said adding a small expansion tank would help protect the well system, the other said the well's expansion tank would handle any back-pressure from the hot water expanding in the heater. Thermal expansion tank required by City... no backflow preventer, pressure gauge or PRV? Even after reading all these comments I don’t understand why the expansion tanks are necessary if they have a good pressure release valve, there are pans under the tanks, and the tanks are in the garage not the attic. The Thermal Expansion Relief Valve can replace a water heater expansion tank because it functions similarly. However, if for some reason a customer has a check valve between the well tank and the water heater they should consider installing a thermal … Best Circulating Pumps For Your Home In 2020, Best Electric Tankless Water Heater For 2020, How Long Does a Water Heater Last? If the extra volume has nowhere to go it pushes on the walls of your plumbing. Your expansion tank can help you to save your system. Both products absorb the excess pressure in the plumbing system created by thermal expansion. Theoretically, depends on length of piping in the water system, etc. The pressure release valve is a safety device and should never activate under normal conditions. A properly sized pressure tank … Also you don’t want the pressure in your plumbing system to build up several times a day, as this will make the weakest part fail sooner rather than later of fatigue. It’s More Than Just a Well Tank™ Amtrol invented the first pre-pressurized well tank over 50 years ago as a better solution to traditional air-over-water tanks. With these two factors, you can then make a decision about what size of expansion tank to get. Understanding how an expansion tank works and the signs that could indicate that it needs to be replaced can prevent the need for costly repairs in the future. Doesn’t mater what your starting water temperature is. The expansion tank serves as a backup system … In fact, some manufacturers may void your water heater warranty if you have a closed plumbing system without an expansion tank. Pressurized well tanks extend the lifespan of your well pump by preventing rapid on/off cycling of the pump and maintaining water pressure throughout your home. An expansion tank can help your water heater last longer and it may even be required in some circumstances. go to lowes or home depot (irrigation department) and get yourself a pressure gauge that will thread onto your house’s garden hose spigot. Each expansion tank manufacturer will have a calculator or chart which will tell you the recommended size and model of expansion tank you’ll need. A pressure switch adjust the internal pressure and activates the pump only if the water pressure in the tank is lower than minimum required. Just one opinion here. Chk your local codes though. I’ve built a small laundry shed which will house a 20 gallon tank, and it’s downstream of a backflow device. Most homeowners simply do not understand just how important their expansion tank, also known as a pressure tank, is to the longevity of their well pump. All the homes I owned with well water or city water I never Had an expansion tank on the hot water heater. This is one of those things you want to make sure you have right. Almost all private water systems have pumps from a well; they will have a check valve and must have an expansion tank in the system -- which mostly controls the pump. The excess water volume, instead of causing too much pressure on the plumbing, rushes into the expansion tank and lowers the pressure in the water heater to safer levels. The pressure relief valve is to prevent the tank catastrophically bursting; it’s set at a high enough pressure that the amount pressure variability the system will see in normal use won’t set it off. Newer models of tankless water heaters can have integral buffer tanks. So it fluctuates several times a day. However, if you have a traditional tank-style water heater, you will most definitely need to consider if an expansion tank is needed. if your water pressure is ABOVE 80 psi then you need to install a pressure reducing valve.