Hi, Having moved into an all electric flat [ for the over 55s]last year we realise we need to replace 2 old Electric Panel heaters in the bedrooms.
Although still working, the old ones have no details of size or wattage on them so I don't know what to order as replacements. I don't understand what a Watt equats to either ?
Neither bedroom is very big but the smallest is just a box room.
If you have no maker's name or details, then, the physical size of the units can give a rough indication of wattage(power output).
Take the sizes to an electrical (trade) counter (NOT the DIY sheds - they have no idea). Their experience should enable them to put you on to a similar product
As The Builder says, a Watt is the unit of power output. More power output equates to more heat (and a faster use of the electricity).
The number of watts is the product (multiplication) of the voltage times the current in Amps. The voltage on UK mains supply is nominally about 240V, so a 1KW (1000 Watt) electric heater uses about 4 Amps when running.
An electrical trade counter may be willing to measure the existing unit and tell you its Wattage - if you catch them at a non-busy time.