Installing new storage heaters is a simple enough for a qualified electrician and you are unlikely to save very much money if you decide to install them yourself and you would still be advised to get the work certified for safety and building regulations afterwards. So when getting quotes, make sure they are itemized so that you can see how much you are paying for the heaters and how much for the work. The heaters themselves will be priced between about £250-£500 each depending on the model chosen, and if you already have dual tariff meters then the work should be fairly inexpensive.
In order to have storage heaters you need a dual tariff meter so that the heaters can make use of economy 7 electricity during off peak times. When you are choosing your new heaters you need to decide what each unit’s power rating needs to be in relation to the room it will be installed in. Also there are different designs out there for different locations, some are designed specifically for bathrooms and have more in the way of control features. Most of them come with convector fans with thermostatic control systems. You may want to opt for at least one unit that features the ability to top up on electricity in peak hours during the colder months.
Any electrician should be competent to install these for you and give you a safety certificate. If you have small children you might want to install safety guards around your storage heaters to protect the units and their controls from inquisitive fingers.
Storage heaters require nothing in the way of maintenance really as they are sealed units and not user serviceable. They do not need yearly servicing, all a service engineer would do if they were inspecting them would be to check for dust between the convector fins and clean them if necessary and do a routine safety check on the connections, possibly use a meter to test the efficiency of the heating elements and test the thermostat is working properly.
Older storage heaters tend to go wrong in one of two ways – either the thermostat will go faulty or, more commonly, the element will be broken. Sometimes there will be a fault with the on/off switch or circuit breaker. These components can be replaced by a service engineer, provided the parts are available. Normally you can expect new storage heaters to work faultlessly for at least 5 years without needing any attention at all.