If your pipes are not froze, I agree with Gene on the stuck check valve on the outlet of the HW heater.
This pic is from my prior 2004 T2499, your 2005 should look the same. See the brass check valve Gene is talking about on the top discharge port
We are assuming the cold it working OK, just not the hot?
Hope this helps
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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