39% off the usage component of the standard tariff for a minimum period of 12 months when selecting the Monthly Smart Saver plan. Offer is only available to residential customers who are eligible WA Seniors Card members. To receive the offer, you must sign up with Kleenheat as your residential natural gas provider (or be an existing Kleenheat natural gas customer) and use the promo code WASENIORS39 during the sign-up process, and your application must be accepted by Kleenheat. This offer cannot be used in conjunction with any other promotional code offer. This offer may be extended, cancelled, or changed at any time at the discretion of Kleenheat.