Unvented hot water cylinder pressure

Joined
12 Feb 2006
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United Kingdom
I had a kingspan unvented hw cylinder fitted 18 months ago. Just checked the pressure vessel and it isn't pressurised at all (no gauge fitted). The pressure at the shower and all taps is good so is it ok to leave it as it is or must it be pressurised? The paperwork left by the plumber says 3 psi I think.
Also the thermostat isn't very good, a gnats cock between warm and scalding. Can I get just the electrical bit changed without draining the cylinder?
Any help very much appreciated, thanks.
 
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