There are four different types of night storage heater, each offering different levels of control and efficiency:
Manual Night Storage Heaters need the heat input settings and heat output settings manually set to determine how much heat is stored during the night and how much is released during the day time. This type of night storage heater are not installed anymore but there are probably tens of thousands still in use.
Automatic Night Storage Heaters automatically adjust the amount of heat stored overnight. This is based on the room temperature and makes them more energy efficient than manual storage heaters.
Combination Night Storage Heaters build up heat during the night similar to automatic models but can also add heat during the day if required.
Dimplex Quantum high heat retention storage heaters have smart control systems which mean that they can build up exactly the right amount of heat during the night. They are highly insulated so as not to waste heat and can provide extra heat during cold days due to a direct acting element and convector fan.
Dimplex Quantum is the most advanced, economical, off-peak electric heater on the market.