The steam heater say it has a fixed 500 kW power consumation and produce 500 kW of heat, but also say that it can consume up to 1800 steam per second at 165 degrees.

The standard boiler consumes 1.8 MW of power from fuel, and converted to steam in a normal steam engine that becomes 1.8 MW of electricity.

So the power conversions doesn't add up for the steam heater, because then it is able to consume much much more than 500 kW, because it can consume 1800 steam per second, and a standard boiler outputs 30 steam per second, and a standard boiler outputs 1.8 MW of "steam power" (if looking at 100% conversion to electricity which is our only reference point) Then it actually consumes 1800/30 = 60. 60*1.8 MW = 108 MW of power, to produce 500 kW of heating power.

Or is it what i suspect, suppose to be 1800 per minute instead of per second?
I have other thoughts but i am adding them to another suggestion post instead.