Flueless gas fires & appliances have been around for quite some time especially in Japan, the United States and Canada.
A catalytic converter is used to convert the gasses, which usually go out through the flue, into harmless Carbon Dioxide and Water.
This means that, as the name suggests, no flue is needed.
Where there is no chimney this technology can be quicker and cheaper to install than a conventional appliance.
There is also the added benefit that no heat is lost through the flue, making this flueless heaters much more efficient. Tests have shown that flueless gas fires can produce up to 3 times the useful heat of conventional gas fires for the same amount of gas used, and up to 12 times that of a decorative gas fire. This makes flueless appliances good for the environment great for your gas bill.
As with all gas appliances, flueless heaters should installed correctly and maintained by a qualified technician. There are separate British Standards for the testing of flueless heaters which must be met when installing and servicing.
In particular, a flue gas analyser must be used used – make sure your engineer both fully understands and uses one.