Posted By John Webster Robin Are you perhaps thinking of the requirement for boilers and other gas appliances in continuous use to be fitted with a flame monitoring (flame failure) device? It is more than likely that your boiler has one already. Check your operating manual or supplier. If you do need to retro-fit something, the cost is more likely to be in the hundreds rather than thousands of pounds.

Posted By Phillip Collins I hope I know a little of what we are talking about here about after 30 odd years in the game, unfortunatly you did not say how big the Boiler was. Typically Boilers need to be fitted with a flame detection device. Typically they monitor ultra voilet or infra red from the flame (Internal of the Boiler). I think a recent posting commented of general fire protection within the Boiler House - something seperate altogether Another option is a flame senser rod (measures change in conductance due to heat) You will also need a low water level cut out - If the water level gets too low the Flame will trip. Flame detection devices should be on a 24 hour period self test logic. If the Boiler attendant does not perform the daily checks If it is an unmanned Boiler there is typically a few things that need to be fitted such as a second pump to ensure the Boiler receives sufficient water whist shutting down if the first pump fails . Manned Boilers may have a second water feed pump as a redundancy Unfortunatly I can only quote you Australian Standards so that would be of no use to you