$145 \u2013 $350, Installed<\/h2>\n<\/p>\n
The cost to install a water heater expansion tank ranges from $55 and up for the rare DIY project, to about $350 when a pro adds an expansion tank to a large residential water heater.<\/p>\n<\/div>\n
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Average Cost of a Water Heater Expansion Tank Installation<\/h2>\n
To hire a plumber in your area, expect to pay an average cost of $265 to have an expansion tank added to your existing water heater. This will include the tank, all plumbing supplies, installation labor and inspection where required.<\/p>\n
Average Do It Yourself cost<\/p>\n
$55<\/b><\/p>\n<\/div>\n Average Contractor Installed Cost<\/p>\n $265<\/b><\/p>\n<\/div>\n Typical Cost Average<\/p>\n $145 \u2013 $350, Installed<\/strong><\/p>\n<\/div>\n<\/div>\n Last Updated: Wednesday, January 12, 2022 <\/p>\n <\/img><\/p>\n Thermal expansion tanks are now required by code for most water heaters using municipal water. This is a result of new codes that require backflow valves to be installed preventing water from your home to flow back into the municipal supply. The valve creates a closed system in which pressure can build.<\/p>\n If you replace your water heater or sell your home, you\u2019ll need to add one to the system. The tank will also protect your water tank, plumbing and fixtures from the increased pressure of a closed system. There\u2019s more information below in About Water Heater Expansion Tanks.<\/p>\n This cost estimate page, or Costimate, covers all potential costs for DIY or hiring a professional. These include job cost factors, retail expansion tank cost and installation labor costs. Prices from a few other reliable cost estimating sites are listed. The information should allow you to make a good cost estimate of what your project price will be.<\/p>\n Thermal expansion tank cost on a water heater is determined by these factors.<\/p>\n The size tank required is based on water heater capacity and the pressure of the incoming water supply line, this is especially important if you have a well pump. Most expansion tanks are less than 5 gallons, since residential water heaters range from about 30 to 100 gallons. Look for a lead-free tank rated for potable water.<\/p>\n Online sellers like Supply House have calculators or charts showing what size tank you\u2019ll need.<\/p>\n Pro Tip:<\/strong> It\u2019s always better to have a tank that is too large than one that isn\u2019t large enough. When in doubt between two sizes, pick the larger tank.<\/p>\n Here are retail expansion tank and installation supply prices.<\/p>\n Here\u2019s why you might need a thermal expansion tank.<\/p>\n Water expands when heated. For example, 40 gallons of water at 60F becomes about 40.6 gallons at 120F, creating significant pressure inside the water tank and pipes.<\/p>\n In older water systems, that extra capacity was pushed back into the municipal water system, an open system. No problem.<\/p>\n By the early 2000s, most cities and counties required check valves on residential water lines to prevent this. These regulations produced closed systems that gave expanding water nowhere to go. The increased pressure often damages the water tank, pipes and fixtures. One plumbing contractor says, \u201cI have seen several cases where pipes or water heaters split due to the pressure\u2026so the expansion tank IS necessary if you have backflow preventing devices.\u201d<\/p>\n Hence, adding a water heater expansion tank became a common indoor home improvement project when connected to \u201ccity water.\u201d If you build a new home or have an inspector in to check the installation of your new water heater, you\u2019ll probably have to add an expansion tank to meet code.<\/p>\n Hiring a licensed plumber is your best bet for having the job done correctly the first time. However, an experienced handyman might do a good job too.<\/p>\n Here are labor ranges for each:<\/p>\n This is a quick job for most pros:<\/p>\n Installing a water heater expansion tank is moderately difficult. Here are the basic steps to help you evaluate whether to tackle it or call a pro.<\/p>\n First, you\u2019ll need the tools and supplies listed in the Retail Costs above.<\/p>\n The expansion tank goes on the incoming supply line. Most installers place them directly above the hot water tank, so the expansion tank is horizontal. This is the easiest way to apply a metal support strap.<\/p>\n However, anywhere on the supply line after the water shut-off valve is OK. The expansion tank can hang vertically as long as it can be supported.<\/p>\n Thermal expansion tank installation step by step:<\/p>\n Watching a pro do it, as seen in this video, will also prepare you for the project. <\/main><\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":" $145 \u2013 $350, Installed The cost to install a water heater expansion tank ranges from $55 and up for the rare DIY project, to about $350 when a pro adds an expansion tank to a large residential water heater. Average Cost of a Water Heater Expansion Tank Installation To hire a plumber in your area,…<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[55],"tags":[],"yoast_head":"\n
\n<\/hr>\nOverview of Water Heater Expansion Tanks<\/h2>\n
Product and Installation Supplies Cost Details<\/h2>\n
Expansion Tank Price Factors<\/h3>\n
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Cost of Expansion Tank Installation Supplies<\/strong><\/h3>\n
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About Water Heater Expansion Tanks<\/h2>\n
Permits, Inspection, Related Costs and Installation Time<\/h2>\n
Permits and Inspection Cost<\/h3>\n
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Related Costs and Installation Time <\/strong><\/h3>\n
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DIY or Hire a Pro?<\/h2>\n
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