Never used heat gun or hot water just turn really hard lol sorry could use a screwdriver and hammer and tap light on one fin in the bottom corner to free it up. You could try the hot water but I would pass on heat gun don't want to melt things.
If so here is what it can handle
Filtration Handling
180 Gallon - Light Filtration Demand
160 Gallon – Medium Filtration Demand
100 Gallon – Heavy Filtration Demand
Fyi, similar thing happened to skimz skimmer impeller. It was cracked so ordered new impeller (87.00) found out my whole pump was old, ended up just sending it back buying whole new pump (120.00) not saying you need to buy a whole pump, but if it's an older unit, then might be worth getting new pump. Good luck
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