Gas swimming pool heaters or electric heaters?

form_title=Swimming Pool Heater Installation or Replacement form_header=11613 Please select the type of pool that needs to be heated*= () Above ground () Spa/hot tub () In ground What type of heater would you like to use? (Select all that apply)*= [] Natural-gas fired [] Propane-gas fired [] Electric [] Heat pump [] Solar heater [] Want recommendation Is the pool indoor or outdoor?*= () Indoor () Outdoor