Water remains one of the most effective fire-extinguishing agents we have, from the humble fire bucket to today’s more sophisticated water fire extinguishers. Water extinguishers should only be used where they work best, on Class A fires, sometimes called ordinary combustible fires. Paper, wood, fabrics, furniture, indeed most things you’ll have stored in your home or office, will provide the fuel for a Class A fire. Water conducts electricity, so water fire extinguishers should never be used in a situation where there are live electricity cables or electrical appliances. They are best paired with another extinguisher that is suitable for use on electrical equipment fires, such as a CO2.