Last reviewed: 12 November 2026
Keep combustion products out of living spaces
Never use or install a gas geyser in a closed bathroom or another unventilated room. Keep required air vents open and make sure the exhaust flue is correctly fitted and discharges outdoors as designed.
Do not block vents, alter the flue, or use a heater with missing or damaged parts. Have installation and repairs handled by a qualified gas technician in line with local requirements and the maker’s instructions.
Know possible carbon monoxide warning signs
Carbon monoxide is colourless and odourless. Possible warning signs of exposure can include headache, dizziness, nausea, weakness, confusion or unusual sleepiness, particularly when more than one person feels unwell around an appliance. These signs do not diagnose the cause.
If carbon monoxide exposure is suspected, get everyone into fresh air immediately, avoid re-entering the space, and contact local emergency services or the relevant gas-safety authority. Seek urgent medical advice for anyone who feels unwell.
Arrange checks and use alarms appropriately
Stop using a geyser that has an unusual flame, soot, repeated shut-offs, a damaged flue, or signs of poor ventilation. Ask a qualified technician to inspect it; do not try to adjust gas parts yourself.
Use a carbon monoxide alarm where recommended and install it according to its instructions. An alarm is an additional warning device, not a substitute for safe installation, ventilation or maintenance.
Frequently asked questions
Can a gas geyser be used in a closed bathroom?
No. Do not use or install a gas geyser in a closed, unventilated bathroom. Follow local rules and have a qualified technician check the installation and flue.
What are possible carbon monoxide warning signs?
Carbon monoxide has no colour or smell. Headache, dizziness, nausea, weakness or confusion can be possible warning signs but do not identify the cause. Move to fresh air and contact emergency services if exposure is suspected.
Can I repair a gas geyser myself?
Do not adjust gas components or a flue yourself. Stop using equipment that appears faulty and contact a qualified gas technician.
Does a carbon monoxide alarm make an unsafe geyser safe?
No. An alarm is an extra safeguard, not a replacement for proper ventilation, installation and maintenance.
Sources and further guidance
Related water guides
- How can I protect pipes and tanks from freezing?
Insulate exposed pipes and rooftop tanks appropriately, and know when to stop and call a qualified plumber.
- Is geyser or tank water safe to drink?
Use a suitable cold-water source for drinking and cooking; hot-water systems and storage tanks need separate maintenance and do not prove quality.