One good, one bad. The bad one needs replacing. Getting it replaced in the summer with an inverter type. For some strange reason, they are cheaper in summer. Go figure...

The shops are full of all manner of heating devices in winter... 
Slimline leccy heaters are good...
Not as good as aircon units...
Leccy heater, 1,000W of lectric produces (ignoring losses) 1,000W of heat...
Aircon unit in our bedroom uses 770W of lectric but can produce 9500 BTU (7,840W) of heat...
Inverter units are even betterer....