Hi, We just had the Regency CI2600 wood insert installed. There's cat temp probe that came with it. And we have been burning at around 1050-1100. This warms our house and is very comfortable. But the dealer, who is returning to fix a couple things, said we shouldn't burn any hotter than 600 degrees. Considering, the owners manual says not to engage the cat until it reaches between 500 and 700, this 600 degree thing seems a bit low to me. And it's cold in here! Any thoughts?? Regency hasn't returned any of my 3 emails, so I can't ask them directly.