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Hey everyone I have storage heaters - never used one before. How do I turn them on ? thanks

Hi all what do these 2 knobs do attached to this unvented cylinder. My hot water isn’t as hot anymore - I’m not sure if accidentally turned the knob around ? it is a JAB unvented cylinder. I am a total newbie to DIY and have just moved into the property btw ! Thanks all see images Knob 1 by...