How much heat do I need for my room? 
As a rough guide you would need about 1 kilowatt of heat for every 14 cubic metres. This should give a comfortable room temperature of 70 degrees fahrenheit ( 21-22 degrees celsius).  This calculation does not take into account central heating, size or type of windows or any wall insualtion.  Measure the width and length of the room and multiply by the height and divide this by 14.

For example: 4m wide x 5m long x 2.5m high = 50m / 14 = 3.5 kW required.


Air Vent
This allows a supply of air from an outside source into the room. This is not normally required for modern gas fires and stoves under 5kW heat out put but is required for stoves over 5kW heat out put and open solid fuel fires. The air vent size will depend on the appliance being installed. Sometimes the addition of an air vent can also solve certain chimney problems.


Flue Types

Balanced Flue
bal flue pipe

Balanced Flue fires vent directly outside through a horizontal co-axial pipe (one pipe within a larger pipe). The outer pipe draws air in from the outside and the inner pipe expels combustion gases. These are generally for properties with no chimney or problematical flues.  Fires are usually fitted against an outside wall.



brick chimney

Brick chimney A conventional brick chimney is recognisable by a chimney stack with a terracotta pot or gas terminal.




pre fabricatedPre-fabricated flue.This is an interlocking metal flue tube system, identifiable by a metal flue and terminal on the roof and a metal flue box behind the fire.



precastPre-cast flue Built from concrete or clay blocks, pre-cast flues provide a rectangular section flue. They can be identified by a ridge vent or metal flue tube and terminal on the roof.



Cologic-convectornvector gas fire

Convector gas fires give a more rapid and even heat distribution throughout the room. Convected heat occurs when a fire actively draws in cold air from the room, passes it through a heat exchanger to warm it up before sending it back out to the room as warm air.



Decorative gas fire
A gas fire designed to be installed in an open flue and to simulate a solid fuel fire. This term is also used to describe a fire that will give minimum heat output.

Flame supervision device/ODS

A safety device that monitors a pilot and cuts off the gas supply to the main burner if the pilot is extinguished. This unit is often required to be changed as part of manufacturers warranty when the fire is serviced.

Flueless or Catalytic Gas Fires
These fires do not require any chimney or flue or even an outside wall – they use the latest in gas fire technology and can be installed virtually anywhere – the combustion gases produced by the fire pass through a catalytic converter within the appliance which converts the poisonous Carbon Monoxide into harmless Carbon Dioxide and water vapour. These fires do require an air vent within the room.

Gas input

The amount of gas used by an appliance usually quoted in Kilowatts per hour on maximum setting.

Heat output

The typical maximum heat output of an appliance usually quoted in Kilowatts per hour.  Not to be confused with gas input figure.

Inset fire
An appliance that fits into a fireplace opening, no part of which projects forward of the vertical plane of the chimney breast. Designed to fit into a standard fireplace opening – these types of real flame fires are the most popular and replicate the appearance and appeal of a coal fire without the inconvenience associated with burning coal. It is suitable for installation into a traditional (Class 1) or Class 2 flue. Balanced flue and Powerflue versions on some models are also available.


Liquid Petroleum Gas. Certain properties, especially in rural areas have no access to natural gas and the most common alternative is to have a LPG tank or bottles installed. Not all gas fires are compatible to work with LPG.

Outset Fire

This type of gas fire hangs onto the wall or sits onto a hearth. It will usually have living flames or a glass front to increase efficiency. It is suitable for installation into a traditional (Class I) or pre-cast & Class II flue. Balanced flue (no chimney or flue required) versions of some models are also available.


RRemote controlemote Control
Operational control on a gas or electric fire. This type of control is ideal for those who want the added luxury of being able to adjust their fire from the comfort of their armchair. In many instances this type of control will be available only as an extra cost option.

slide controlSlide Control
Operational control on a gas fire. This type of control is ideal for those who want to be able to switch the fire on/off or up/down without having to kneel or bend down to hearth level. The control lever is located at high level on the side of the gas fire. A mechanical linkage connects from the lever to the gas control knob beneath the fire. In most instances this type of control will be available as an extra cost option.