A device that generates and radiates heat, typically to warm a room or building.
The most common way to heat a home or workplace is with an electric heater. They can be very efficient, but if used for long periods during peak hours they can be expensive to run. You can reduce the running costs by using a timer and thermostat, or using a night storage heater which is charged at a lower rate.
Another option is a gas heater, which will warm a room more quickly than an electric one. However, they are not as energy efficient as a convector or radiant heater and will lose some of the warmth from the room to the outside air, as well as releasing exhaust gases and moisture. You can save money by using a heater with a higher efficiency rating, which will convert more of the gas into heat output for the room.
Finally, you can also use a water heater to warm your home. This is the most effective way of heating your home, as it will warm water for hot showers and baths as well as providing heat for central heating. This will be more cost-effective than a gas heater, but it may be more costly than an electric heater.