It looks to me like the gas vapouriser has too many issues with condensing. But, by a fortunate stroke of serendipity this discussion has come round to vaping from above - which, for those with an under floor entrance, is a good solution.
I think it is time to ditch the gas vapouriser and go back to the varrox type of vapouriser. The advantages are that you can easily insert it under an eke by simply making a notch in the wood. There's no problem with the heat on the crown board (wood or perspex) if like me you use a piece of slate to cover the feeding hole in the crown board - you slide the slate off the hole using the varrox then rest the varrox on the slate.
The final part of the process is you use a 12v pump used for blowing up air beds (or compressed air) which you insert through the side of the eke having drilled a small hole.. (£9.99 on Amazon - http://amzn.to/2wDeETT)
You can then watch through the perspex top as the vapour disappears down through the crown board as you switch on the pump..
No flames to worry about - no heat shields, no condensation.
I think it is time to ditch the gas vapouriser and go back to the varrox type of vapouriser. The advantages are that you can easily insert it under an eke by simply making a notch in the wood. There's no problem with the heat on the crown board (wood or perspex) if like me you use a piece of slate to cover the feeding hole in the crown board - you slide the slate off the hole using the varrox then rest the varrox on the slate.
The final part of the process is you use a 12v pump used for blowing up air beds (or compressed air) which you insert through the side of the eke having drilled a small hole.. (£9.99 on Amazon - http://amzn.to/2wDeETT)
You can then watch through the perspex top as the vapour disappears down through the crown board as you switch on the pump..
No flames to worry about - no heat shields, no condensation.