Star Saver tariffs are available to anyone in the Isle of Man who uses gas for central heating from the mains system.  It can be applied whether your gas-fired central heating is via radiators or warm air. By using Star Saver, all gas in the house is supplied at a lower rate.  This means that you can enjoy the same cost benefits for cooking and gas fires as you have for your heating and associated hot water. A Star Saver low tariff is applied throughout the day, throughout the year, without exception.