Old toilets must have a flush capacity of at least 13 litres (3.5 gallons) to be eligible for the rebate program. If your toilet has been in place earlier than October 2011, it is likely eligible. You can also check the flush capacity by looking on the inside or outside of the toilet tank.
Eligible water efficient toilets must be Canadian certified (e.g. CSA, CUPC, Warnock Hersey) and have a flush capacity of maximum 4.8 liters (1.28 gallons) for single-flush models, or 4.1 to 6 litres (1.1 to 1.6 gallons) for dual-flush models. Check with your local retailer or plumber before you make your purchase, or look for the flush capacity marked on the inside or outside of the toilet tank.