受热

受 = 爫 + 冖 + 又 : Mnemonic symbol: 受 is often used in a negative sense, when something bad happens to the speaker. I thus represent 受 by a stretcher, which is used to transport injured persons.

受 = 爫 + 冖 + 又 : Sherlock Holmes lost a boxing fight in the outhouse, and he's lying on a stretcher in the bathroom now. He still has his boxing gloves on. He got beaten so badly that is opponent was even able to shave his head with an electric razor. Nobody had a cover at hand, so he's just provisionally covered with a cooking top.

热 = 执 + 灬 : Robinson Crusoe wants to heat himself up in the elevator's bathroom, so he burns his good-for-nothing grilling license on a grill to ignite a sizeable flame.