If you're thinking of buying a portable electric or gas space heater, consider these points:

• SIZE: a portable heater should be easily moved from room to room
• POWER: measured in watts or kW, the higher the number the more the heat output
• FEATURES: consider ease-of-use, thermostat control, auto timers
• ECONOMY: electric heating is expensive. gas cyclinders produce damp water vapour and condensation

  

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Example: 'gas heater', 'cheap electric heater' or even 'portable room heaters'