I have winterized my 1999 Marquis. No water in the plumbing or storage tanks. Seaward hot water heater is drained and breaker turned off. As I understand the Hurricane system, it is my belief that the Hurricane heats and circulates the fluid in a closed system. When water is in the plumbing system, water passes through a heat exchanger to get it's warmth. For coach heat, it is the fluid in a closed system that is circulated through the Hurricane where it gets its heat and circulated throughout the coach registers (and engine if requested). Question; Is there any reason I cant run my Hurricane for coach heat without water in the plumbing system? My guess is the plumbing system and the coach heat system are completely independent of each other and the Hurricane can be run with or without water in the plumbing system. Am I right? Thanks in advance.