Heater relay – 20 amp or 70 amp?

[markeb01]

I’m going to be wiring a relay in my heater circuit soon. I’m running a Fiero heater fan motor, and can’t find the amperage draw anywhere.

I have a Hella relay rated at 20/30; 12/24V. I’m not sure if this means 20 amps at 12 volts and 30 at 24 volts, or it’s good for 20-30 amps.

I also have a Signal-Stat relay that was used in my air conditioning wiring. I’d prefer to save this for a headlight relay addition.

Please advise if either of these are suitable for a heater circuit, or if I should buy a relay with a different rating.