Ohio Water Heater Authority is an independent, privately owned water heater service company and a Transit & Flow™ company. We are not a government agency and are not affiliated with the State of Ohio or any public utility.
An expansion tank is a small tank with an air cushion separated from the water by a bladder. It absorbs the extra volume created when water heats, keeping system pressure stable.
Code requires one when the home is a closed system, meaning a pressure-reducing valve, check valve or backflow preventer stops water from flowing back to the main. The air side must be pre-charged to match house pressure or the tank does little.
Details, sizing and pricing are in the expansion tank guide.
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