I was told exactly the same when I bought a heatwave desert large, that a stat was not necassary. Stupidly I followed their advice without investigating further and consequently a day later parts of the actual mat itself had melted away and it stopped working. To add insult to injury they wouldn't even give me my money back
Anyway seems you got it sorted, just felt like having a rant as am still annoyed to this day about that.
1.0.0 Dumerils Boa (Khan)
1.1.0 Corns (Snow Coral Motley 'Jonesy' & Carolina het Am,An,Hyp,Mot 'Indy')
0.0.2 Crested Gecko (Billy The Kid & Jesse James)
0.1.0 Bearded Dragon (Missy)
1.0.0 Leopard Gecko (Derick)
0.1.0 Homo sapiens (Nicole)