Not in the US, but I have two meters on my house. One meter is attached to most of the circuits, and charges the 24/7 rate. The other meter is attached to the

Not in the US, but I have two meters on my house. One meter is attached to most of the circuits, and charges the 24/7 rate. The other meter is attached to the heater system, only works off-peak, and charges a discounted rate. The heater is basically a slab of steel, wrapped in heating elements, surrounded by insulation. It heats up when the power is on, and temperature controlled vents let air circulate when it's cold in the house. Works ok, but I'll probably change it out for a heat-pump soon.