Not much hot water in tank

[paulfoel]

Got a hot water tank system. Recently noticed that no matter how long the hot water is set to heat there is much less hot water than there used to be. Runs out really quickly -as if its heating half a tank or something.

Anything obvious to look for?

 

[terryplumb]

Depends on your system for heating water ,is it heated by a gas boiler ,or electric immersion heater /s ,some have two immersion elements. Could be thermostat related.

 

[Dan Robinson]

Pictures please - including any local switches.