1
Q
Electricity.
Advantages.
A
Convenient.
Easy automation eg. thermostats & timers.
Little condensation.
2
Q
Electricity.
Disadvantages.
A
Require mains electricity.
Expensive to install if there is no supply.
3
Q
Electricity.
Types of installations
A
Fan heaters.
Convection heaters.
Tubular heaters.
Soil warming cables.
4
Q
Paraffin and Bottled Gas
Advantages.
A
Portable - no mains supply required.
Cheap to install.
Gives off Carbon dioxide which may benefit plants.
5
Q
Paraffin and bottled gas.
Disadvantages.
A
Difficult to automate - bottled gas can have thermostatic control.
Generally low heat output.
Produces water vapour - condensation.
Gives iff toxic fumes; some ventilation necessary which reduces temp.
