I have installed two baseboard electric baseboard heaters in my
basement. One is 1000W and the other is a 500 W unit. They're both on
the same circuit breaker and joined at a junction box near the circuit
box.

I'd like to add an indicator light (preferably on the first level) to
let me know if they are on. I think I need some kind of light to detect
current.

I'm looking for a cost effective way to let me know if either (or both)
heaters are drawing current.

Any ideas?

Julian