hot water cools down

[sid]

Recently(about 3 weeks) the hot water for the shower finishes after only 1 shower which never was the case before.There are 4 of us in the family and our routine has not changed.Obviously,then we have to wait before water heats up again.
We have a potterton suprima 80l boiler with tank in loft.Can anyone explain why and what I need to do to remedy this.🙂

 

[Puddle]

With suprima,check boiler coming on correctly when turned on,maybe boiler not working correctly at start up and restart after temp reached ,taking a while to come on when required thus not heating water correctly,ie takes longer
Also maybe you were having help heating water by an immersion heater as well a boiler and this has been turned off or stopped working

 

[sid]

Thanks.Makes sense.I will check the immersion which I think should be on the tank.