Heat output from a 200W electric radiator?
Yes, electric heaters are basically a resistor.

A resistor converts electric energy into heat, it does that with 100% efficiency.

That might sound weird but think about it this way: if a resistor was 90% efficient, where would the 10% "lost" power go?

Nearly all not 100% efficient devices lose the wasted energy as heat. Generating heat is the sole purpose of a (resistor) heater. So even if the heater was only 90% effcient, that 10% would still be heat, making the efficiency 100%.

So indeed the heater consumes 200 W (when it is in operation) and it will then also emit 200 W of heat.