Not all Gledhill appliances have a serial number:
The 12 digit serial number on unvented cylinders (e.g. StainlessLite Plus) and thermal stores (e.g. PulsaCoil, BoilerMate) is printed underneath the bar code on the data label or information badge located on the appliance. It is also found on a dedicated label towards the top of the appliance. The first and last digits are spaced slightly away from the rest of the number, displayed in the following format:
X XXXXX XXXXX X
Please note that all 12 digits are required please.
If you have an open vented cylinder, a PulsaCoil or a BoilerMate, instead of a serial number, your appliance should have a delivery note (format A12345) and a job number (format XXX/XX). Again, this would be found on the appliance data label or information badge. Please ensure that you provide this information when registering your cylinder for the warranty.