Did you mean the Federal Tax Credit codes for Energy Star?
Here are the Consumer Energy Efficiency Definitions. None of the Codes specifically say "heat provider." You'll need to choose the one that best applies to you.
Please note, not all ENERGY STAR qualified products qualify for a tax credit. ENERGY STAR distinguishes energy efficient products which, although they may cost more to purchase than standard models, will pay you back in lower energy bills within a reasonable amount of time, without a tax credit.