We have a stacked set of hot water heaters in the bay with the propane tank and the air compressor. Today the warm is only luke warm. The fresh water heaters are on. The circuit breaker is not tripped. We are plugged into 50 amps. All the meters look right. Before I pull off the covering and examine the heaters (which are new Nov 2008) I was wondering if there is anything someone can think of that might be the issue. Thanks.