Any comments on this sungood firebox design?

[morrillt]

Here is the current HLT design I am about to purchase from sungood. Any comments before I order?

[TiminOz]

For an HLT I think the option of either steam heat or electric immersion heater is a much better way to go! I don't think you will find many users of a direct fire HLT here, but I could be wrong.

[morrillt]

shots of the mashtun and brew kettle




I found out that they are using some sort of temperature resistant cotton, is that as good r value wise as perlite? thanks!