Natural Gas Furnaces – $250 Rebate* For replacing a less than 96% AFUE natural gas furnace with a 96% AFUE or higher condensing natural gas furnace. Natural Gas Boilers – $1,000 Rebate* For replacing a less than 90% AFUE natural gas boiler with a 90% AFUE or higher condensing natural gas boiler. Natural Water Heaters… Read more »