How to size an expansion vessel?
When the system’s water volume is unknown, you can estimate the expansion volume from the boiler power. Most 25kW boilers can use a 24ltr vessel, 60kW boilers need a 50ltr vessel, and a 120kW boiler needs at least a 100ltr vessel. However, there are other factors so it is always wise to consult an engineer.
How does an expansion vessel work?
Water expands as it heats, so modern sealed expansion vessels contain a diaphragm that expands and contracts, accommodating changes in water volume and pressure. Water from the vessel returns to the system as it contracts - maintaining a constant safe pressure at all temperatures. Being sealed, the water is also protected from contamination.
What size expansion vessel for heating system?
The rule of thumb for systems with a pressure of up to 1.5 bar is that you need 1 litre capacity for each kW of output from the boiler. You should always round up, so a boiler with 160 kW output should have a 200 litre expansion vessel.
How much is a boiler expansion vessel?
Small expansion vessels, suitable for use within home central heating systems can be found for less than £50. For larger central heating systems used in commercial properties, the cost will rise from a few hundred pounds to upwards of £1000 for the largest expansion vessels.
How to size an expansion vessel?
When the system’s water volume is unknown, you can estimate the expansion volume from the boiler power. Most 25kW boilers can use a 24ltr vessel, 60kW boilers need a 50ltr vessel, and a 120kW boiler needs at least a 100ltr vessel. However, there are other factors so it is always wise to consult an engineer.
How does an expansion vessel work?
Water expands as it heats, so modern sealed expansion vessels contain a diaphragm that expands and contracts, accommodating changes in water volume and pressure. Water from the vessel returns to the system as it contracts - maintaining a constant safe pressure at all temperatures. Being sealed, the water is also protected from contamination.
What size expansion vessel for heating system?
The rule of thumb for systems with a pressure of up to 1.5 bar is that you need 1 litre capacity for each kW of output from the boiler. You should always round up, so a boiler with 160 kW output should have a 200 litre expansion vessel.
How much is a boiler expansion vessel?
Small expansion vessels, suitable for use within home central heating systems can be found for less than £50. For larger central heating systems used in commercial properties, the cost will rise from a few hundred pounds to upwards of £1000 for the largest expansion vessels.