Heating Expansion Vessel Sizing Guide

A short guide to assist in the sizing of a Heating Expansion Vessel, using just a few system calculations you can more accurately choose the correct size Heating Expansion Vessel for your system. 

The guide provided is to assist with the sizing of a Heating Vessel and we would always recommend if unsure then refer to the system manufacturers guidelines to correctly size the Expansion Vessel.

Vessel KitStatic HeadSystem VolumeBTUKW
(Metres)(Litres)
5 Litre58730,3668.9
106922,5597.18
8 Litre513945,02414.33
1011136,13311.5
12 Litre520867,80421.58
1016754,19917.25
18 Litre5313102,11532.5
1025081,15725.83
1518860,48319.25
24 Litre5435135,32143.07
10348105,33134.48
1526181,35625.9
35 Litre5696197,92563
10557158,02050.3
15417117,71637.5

This chart is to be used when sizing a Heating Expansion Vessel and not for Potable Water Applications.