I don't use the sportcat. I use the Blackcat. It won't tip over like the one you are looking at! I use it in a 2 man clam, gets too warm in my scout. In the clam it warms to shirt sleeve temps, at below zero weather.
Except for knocking over works great.
Got to go. Going to check out some ice!!
Keep it safe and watch out for the mountain loins!