Actually, no the steam isn't much of a problem. I thought it may condense but it doesn't, this may be because of the heat of the hlt heating that area up. No burner up top though, I have two kettle elements mounted in opposing sides of my hlt, this weekend I will be constructing the thermostat control to automate this part of the system as my parts from Altronics.com arrived. Can't wait actually, just to get up in the morning and mash in straight away, then go and have breakfast.
I don't doubt there are better designs out there but this works or me, I live in a smallish 2 bedroom flat so space is limited.
Cheers JD