A continuous flow water heater is small and easy to install outside, freeing up storage space inside. It heats the water as long as the tap is turned on, so you never run out. No hot water sits in storage, so you only heat what you need, making a continuous flow system highly efficient and cost-effective.
A gas storage cylinder is also very efficient. It fits into the same space as a traditional electric cylinder and unlike the electric option, it can be installed outside and reheats stored water faster. This means more hot showers in the same time period. They come in a range of sizes. Some models do not require electricity and can operate even when power is off. They can operate on mains pressure, unequal pressure or low pressure.