Comment by ephbit

I'd guess "huge space heater" would certainly have to exceed 250 MW (that's at least 100,000 kettles).

IIRC that'd equal vaporizing water at 125 kg/s, doable but that's 10,800 m³ water per day.

Aaaand, in order to get the kind of contract from a power utility where they pay you to turn off, you'd probably need to operate a decent fraction of the day, say 25 %.

So you'd first need to build this thing and then you'd need to draw 1.5 GWh of electricity per day.

At 50 USD/MWh, you'd pay USD 27 million a year for the electricity to operate.

Not sure this'll work out financially.