Adding a 20 AMP tandem circuit breaker

[Azurite]

Hi. I am DIYer who is trying to add a 20 AMP circuit to a residential Challenger SB12(16-24)CN Mod.1 panel. The purpose of the circuit to is to allow the use of a 1400W pond vacuum. My first thought/question is whether this panel is compatible with tandem breakers (ie Eaton BR2020 breaker?). I am attaching photos of my panel. -Jon

 

[Megawatt]

Hi. I am DIYer who is trying to add a 20 AMP circuit to a residential Challenger SB12(16-24)CN Mod.1 panel. The purpose of the circuit to is to allow the use of a 1400W pond vacuum. My first thought/question is whether this panel is compatible with tandem breakers (ie Eaton BR2020 breaker?). I am attaching photos of my panel. -Jon

It being an Eaton panel type BR breakers you can buy the tandem breakers at Home Depot or Lowe’s

 

[norcal]

Eaton BR is OEM for Challenger, notice the 2 catalog numbers on Eaton BR breakers, BRxxx, & Cxxx, a 20 ampere single pole would be BR120, & C120, the "C" is for Challenger.