You’ll need to select a storage heater or combination of storage heaters that adds up to the total required wattage. For example, if your room requires a 5kw wattage you could use a 1.7kw and a 3.4kw storage heater.
Note that the total wattage in this example would be 5.1kw. If you can’t find a combination of heaters which adds up to the required wattage, it’s always better to go for a higher wattage. Under-specifying your heating can leave you with insufficient charge to heat your rooms. Choosing a more powerful heater guarantees your comfort all year round, and still gives you the option to save energy by reducing the power output when the weather gets warmer.
Before purchasing, make sure you’ve accurately measured the wall space and checked the dimensions of your chosen product to ensure that the heaters will fit.
Don’t forget to check the depth of your storage heaters, especially if you’re installing them in a walkway or near a door. Storage heaters are much bulkier than conventional central heating radiators, usually measuring between 15 and 20 centimetres deep.