Hot Water Furnace Expansion Tank

A key component of a hot water boiler system is an expansion tank attached to the boiler or the nearby heating pipes.

Hot water furnace expansion tank. Expansion tanks aka thermal expansion tanks are essentially safety devices to help you minimize the risk of damage to your hot water tank they are an add on to your existing hot water heater and are often installed on the water supply pipe to the water heater normally this is on the wall next to or very close by your hot water tank. It is used to absorb excess water pressure. The boiler expansion tank absorbs the expanding water by allowing the air in the expansion tank to compress this prevents the pressure from building and allows the boiler to heat and cool without too mush pressure building up. It has a diaphragm separating both.

It has an air bleeder on the bottom of it. For 125 150 mbtuh you d use an amtrol extrol 90. The expansion tank serves to provide space for water and air within the boiler system to expand and contract without damaging pipes or valves. Tanks not equipped with a site glass need an airtrol fitting.

Constant fluctuations in water pressure can be dangerous and they can damage the water heater properly installing a thermal expansion tank can solve all these issues. The hot water expansion tank is a two gallon tank that hangs off of your hot water system or your boiler. This water heater expansion tank stops hot water from backflowing into the cold water line and prevents hot water from escaping through the pressure relief valve and onto the floor. Air may also find its way via the heating water to other air bleeders or vents in the system.

For a 100 mbtuh boiler you d use either an amtrol extrol 60 or an amtrol fill trol 111. So when the water pressure gets too high it will flow into your expansion tank instead of damaging your home s plumbing valves fixtures and joints and potentially causing a. It is designed to handle that excess water that builds up. Located on the bottom of the expansion tank is a fitting.

Without it you would be at risk for damage to your water lines fittings and water heater. A water heater expansion tank is an additional small thank that is attached to your water heater unit. Expansion tanks are installed down the line from the inlet valve that supplies the water heater in your home. Typical expansion tank sizes for a cast iron radiator type typical residential heating system.

In older hot water heating boiler expansion tanks that do not have an internal bladder to keep air and water separate over time air in the expansion tank may become absorbed into the heating water. An expansion tank is used to prevent issues related to excess pressure from your home s hot water supply. Most of the time your tank is half water and half air. Ratio of air to water inside the steel expansion tank hot water boiler expansion tanks.