I recently spent a good chunk of cash on a tankless hot water heater for propane. I ordered it online. I got it here and tried to have it installed only to find that it is not approved for mobile homes. The company said that its electric models are the only ones approved for mobile homes. Can an electric tankless go somewhere in a propane hwh/heat home? I do have electricity. I'm so frustrated... Why couldn't it have said not approved for mobile homes on the box, or on the order page, or something??