Zilmet - Sealed System Expansion Vessel Calculator
What youll need to know.
1. Is the boiler suitable for sealed systems? Please contact the manufacturer.
2. Enter the system volume in litres. If you dont know, press the calculate estimate button and enter the power of the boiler at the top of the page. You will then be given an approximate system volume for a 3 bedroom house under various conditions. Use this estimate in your calculations BUT check the results at a convenient opportunity.
3. Enter the SRV discharge pressure, the pre charge pressure of the system and the hot water circulating temperature.
4.The result of the calculation will be shown at the top of the page.