How much does it cost to install an expansion tank on a water heater?

How much does it cost to install an expansion tank on a water heater?

Expansion vessel price

The function of the boiler expansion vessel is to absorb or compensate in the first instance (before any other component of the boiler), the volume variations that the water undergoes when its temperature changes. This makes it possible to maintain the pressure inside the heating circuit within the correct parameters.

All this means that the expansion vessel is the first safety component of the boiler and the heating circuit. If the boiler’s expansion vessel breaks down and does not perform the function of absorbing the excess volume of hot water, then the pressure will rise excessively. From a point onwards, which is usually 3 bar, the pressure will have exceeded the set point of the safety valve, and the valve will start to expel water to reduce and normalize the pressure.

Notwithstanding this second safety step against excess pressure, the expansion vessel must be in perfect working order. Because if the expansion vessel fails and by chance the safety valve (a sensitive and failure-prone component) also fails, the boiler could build up excessive pressure and explode.

Expansion tank

An expansion vessel is an element used in hydraulic circuits. Its mission is to absorb the increase in volume that occurs when the fluid in the circuit expands as it heats up. This occurs, for example, in heating circuits. We fill the circuit when it is cold, and when it heats up, an increase in volume is produced. The expansion vessel has the function of absorbing this difference in volume so that the pressure in the circuit remains stable.

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If after reading this explanation you still do not know or do not want to calculate the expansion vessel you need, remember that if you send me an email I can calculate it for only 10 €.

Expansion vessel regulation

Let’s talk about the expansion vessel, the indispensable safety element to protect our boiler installation, the mechanism in charge of taking care of our heating circuit and production equipment.

The expansion vessel is a metal tank with an elongated or rounded rectangular shape, usually painted in a characteristic red or gray color if it is for heating use and white if it is for domestic hot water use.

The main function of the boiler expansion vessel is to absorb the pressure changes of our installation or boiler due to the increase in temperature of the water when we heat it, thus avoiding exceeding the maximum pressure at which our system can work and avoiding problems in our appliances or circuits and their wear due to excess pressure. This pressure is determined by the safety valve. In domestic installations, the safety valve is normally set at 3 bar, while the usual working pressures of a heating system are around 1.5 bar.

Automotive expansion vessel

An expansion vessel is an element used in hydraulic circuits. Its mission is to absorb the increase in volume that occurs when the fluid in the circuit expands as it heats up. This occurs, for example, in heating circuits. We fill the circuit when it is cold, and when it heats up, an increase in volume is produced. The expansion vessel has the function of absorbing this difference in volume so that the pressure in the circuit remains stable.

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– Open: they were always located at the highest point of the installation and consisted of a water tank, an overflow and an automatic filling system that introduced water into the circuit when the level dropped, for whatever reason. They were very simple devices that had several problems: they could freeze, or they could lose water by evaporation, they contributed to the oxidation of the circuit components… Since 2007 their installation is forbidden by the RITE (Regulation of Thermal Installations in Buildings).