The GEC nightstor 100 is a wet system boiler it weighs 9.8 of a ton and has 168 bricks inside which heat up during eonomy 7 period on a full charge the core can reach 1000c, when the ocupier wants heat during the day a fan starts and draws heat from the bricks and and puts it through a heat exchanger then a pump circulates it round the radiators therefore it only uses about 150 watts per hr to run the fan and pump, so it is very economic and faster than oil or gas and never needs servicing, kind regards the nightstorman.
By Homebuilding & Renovating on We have a 25 year old Nightstor 100 which has served us well to heat a 4 bed house with 12 rads. Heating is usually off between end May until October and we use about 12-14 MWhr a year for heating on economy 7.
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The Gec Nightstor dry core electric boiler was originally produced for new or existing housing as a direct replacement for oil fired and solid fuel boilers. A range of boilers was produced with capacities up to 250 kwh for applications from a small house to large commercial or industrial situations, in addition where large heating demand needed a bigger storage capacity several dry core boilers were used in tandem. A dry core boiler operates on the off peak storage principle. Heat is stored during the night when electricity is much cheaper. Heat can then be drawn off when required, by a fan to drive the air around a closed loop within the brick core and over a heat exchanger through which water is passed.
The heated water serves a low pressure heating system in the normal way GEC boilers are at point of use up to 97% efficient as their is no combustion process to which the heat can be lost to. If the electric supply comes from a green form of generation the whole process is carbon free. Being built by GEC a major electrical engineering contractor & later by APECS run by ex staff of GEC the quality of the engineering was such that boilers now over 25years old are still as good as the day they were first installed. The GEC Nightstor Dry Core boiler in our opinion is the best electric boiler ever produced in the uk. A smaller boiler called the Compact was developed from the 60+ boiler which was originally developed as the first under worktop unit by GEC. The first compact boilers used a internal flow boiler to top up the system if the dry core store became low, most of these were however modified to exclude the flow boiler in preference to using the dry core for top up. Most Compact boilers were installed on the new day time top up tariffs such as Economy 10.
With low running costs, clean and very efficient operation the GEC Nightstor dry core boiler remains the most successful electric boiler ever produced in the uk.