Gas Fires & Wall Heaters revision notes
Fires and wall heaters — flueing, spillage testing and atmosphere-sensing safety.
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BS 5871: Hearth Sizing, Spillage & Atmosphere Sensing
Gas fire and space-heater safety checks
The big safety themes for gas fires and heaters: air supply, flue performance and the fuel bed.
Gas fire fuel beds, radiants and coals
Why the layout of coals, radiants and the fuel bed in a gas fire is a safety matter, not just looks.
Oxygen depletion sensors (ODS) and atmosphere sensing on flueless gas fires
How an ODS detects low oxygen levels and shuts off the burner to prevent CO buildup.
Space-Heater Flueing and Spillage Testing
Heater Types, Hearths and Carbon Monoxide Risk
Flueless heaters and the atmosphere-sensing device
Why flueless gas heaters depend on room ventilation and what the atmosphere-sensing device protects against.
Heater types and where carbon monoxide risk comes from
How open-flued, room-sealed and flueless heaters manage air and products, and where CO risk arises.
In-depth guides for this module
Longer walkthroughs that sit alongside the revision notes.
HTR1 revision guide: gas fires, space heaters and their flues
HTR1 revolves around fire types, the chimney behind them and proving the room and flue can live safely with the appliance.
Flame supervision device explained: what an FSD does and how it fails
An FSD proves flame and stops gas continuing to pass if the burner is not safely alight.
More gas modules
Every module has its own revision notes and question bank.