Ilya I agree with you, that is why I have taken basic not copper/iso. Main question that I can't seem to find definite answer to is about heat soak. Do we have any members that installed only basic and then installed aramid gasket and felt a difference?Ilya wrote:Copper/ISO Thermal is for cold weather climates. I think you'll be fine. If you aren't sure, call them and tell them where you live and they may be able to advise.