Get $150 cash back on – Portable/Unflued Heating Cooktop, BBQs Outdoor Heating Offer expires 31st October 2018. To claim your cashback Buy a selected Natural Gas appliance and have it installed in your home, replacing a non-Natural Gas appliance. Your Gas Specialist will complete a Certificate of Compliance and give it to you along with a proof of purchase document. Visit gonaturalgas.com.au and complete the online claim form. You will receive a Natural Gas .