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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> Pressure vessel in hot water heaer https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1361178038 Message started by tula on Feb 18^th, 2013, 9:00am

Title: Pressure vessel in hot water heaer
Post by tula on Feb 18^th, 2013, 9:00am

What is the purpose of a pressure vessel in an electrical unvented hot water heater ?

Title: Re: Pressure vessel in hot water heaer
Post by thescruff on Feb 18^th, 2013, 11:50am

They are actually called Expansion Vessel which is probably self explanatory.

The water expands as it gets hot and needs somewhere to go, otherwise the safety devices would blow.