The Warehouse is doing a free heater swap for the next three weeks, Stuff reports, in a bid to help make Kiwi homes warmer and safer this winter. From June 13 to July 3, The Warehouse will run its first Healthy Heater Swap in 30 stores, where people can trade in their LPG gas heater for an electric option at no charge. LPG gas heaters havedamaging respiratory effects because they emit a “significant amount” of carbon monoxide and nitrogen dioxide, pollutants that can trigger asthma and other respiratory conditions.