Why Experience Matters With a Pool Contractor: Did Pentair start rodent proofing heaters?

We just had our pool equipment installed and I wanted to make sure that I am diligent and rodent proof our MasterTemp 300 heater. I was on the MK RodentProof website to buy a precut kit and noticed that our heater doesn’t match their “A” or “B” kit. It seems as though our heater already some level of rodent proofing already. Our heater has manufacturing date of 7/28/2020 and here’s some photos.