Thanks VaughnH,

It was just a thought ..... I had suspected that the contact time between water and heating element wouldnt be enough to make real difference.
I also wasn't sure if there would be any issue with the direction of flow through the inline heater when draining water from the tank (I suppose that depends on the heater design), and the fact that the heater needs to be plugged in ..... might not be convenient when moving the hose around.

I guess I'll just use the mixer tap and be happy that I'm no longer carrying buckets around the house

So it's 'Full EI' on this tank with 50% weekly water changes, using the JBL Auto In-Out kit and adding dechlorinator


Thanks again

....Al