dual immersion

Evening all I have an Albion hot water cylinder which is giving 4 -5 seconds of water out of the hot taps, then trickling off to nothing. I'm guessing it is an airlock. Any quick pointers in how to release the airlock to get water flow? TIA

I recently posted a query about installation of dual immersion heaters (my first dual) and received very useful information and advice. I am now doing a similar job but with a stainless steel cylinder. I know that I need an incoloy or titanium heater for this cylinder. These are the specs...