??? do all 2720 sl's have electric and gas water heaters? We have had our TM for a year now and have always used the gas.  Last week we were going to use the electric.  In the box outside is only a gas setup. ( I think).  there is no pin, no on/off button or anything.  Did I miss something here.  We couldn't use hot water because the electric wouldn't do it.  Can you help me figure this out.  Also, all the water is drained from the TM for winter storage, if I just open all the underside valves, will this keep water lines from freezing up?  I need any help I can get.   thanks,  Betty ???