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 Kit	Static Head	System Volume	BTU	KW
	(Metres)	(Litres)
5 Litre	5	87	30,366	8.9
	10	69	22,559	7.18
8 Litre	5	139	45,024	14.33
	10	111	36,133	11.5
12 Litre	5	208	67,804	21.58
	10	167	54,199	17.25
18 Litre	5	313	102,115	32.5
	10	250	81,157	25.83
	15	188	60,483	19.25
24 Litre	5	435	135,321	43.07
	10	348	105,331	34.48
	15	261	81,356	25.9
35 Litre	5	696	197,925	63
	10	557	158,020	50.3
	15	417	117,716	37.5

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