Wood, gas and pellet burning stoves; fireplaces; fireplace inserts, excluding cooking appliances; outdoor fireplaces; electric fireplaces; gas fireplace log sets; barbecues and grills; space heaters; patio heaters; outdoor heaters; gas, oil, electric, waste oil, wood and pellet boilers, furnaces and hot water heaters, for domestic and commercial use; solar water heaters; air-to-air heat pumps, geothermal heat pumps, water-to-air and water-to-water heat pumps; air conditioners