Water filled extinguishers, while very effective, are large and heavy and therefore not very suitable for stowage and use in small craft. It is unusual to find a yacht with a pump rigged for fire fighting, although it would be very easy to do, using a modern bilge pump in reverse. This could give a discharge of about 8-10 gallons per minute, which would probably match the performance of a bucket wielded by a desperate yachtsman. Having seen it demonstrated on several occasions, I can assure you the effect is spectacular and frightening, with the height of the flames increasing instantly by four to five times. Water is probably best used as a back up to the fire extinguishers and to cool down the burnt area when the flames have been put out.
Fire blankets are ideal for smothering blazing frying pans.
Extinguishers should be sited within easy reach at any time, preferably with one close to the main hatch where it can be reached from inside or outside the cabin, one close to the engine, and one at each either hatch or cabin. No individual extinguisher should have a capacity of less than 1kg. If you ever have to use an extinguisher, remove the safety devices, then aim the discharge nozzle at the seat of the fire from as close a range as possible before pulling the trigger. Do not aim over the fire, but try and put the fire out from front to back. The sizes of extinguisher recommended can be used in one hand with the arm fully extended and if necessary the other arm can be used to shield the face from the heat of the fire.