Call Jayco Customer Service and ask them. But, I don't think the tanks are heated, at least if they are, nobody told me the tanks on my 28DSBH are heated. From what I understand, the Glacier Package just gives you a little more insulation in the floor and roof.
2014 Ford F-250 Lariat Crew Cab 4X4, 6.2L gasser, 3.73
2013 Jayco White Hawk 28DSBH
2012 Ford F-150 Lariat Supercrew 4X4, 3.5L Ecoboost, 3.73 (traded)
2005 Jayco 1207 (second PUP)
1976 Coleman Brandywine (first PUP)