Location of water heater March 13, 2014, 03:29:56 am Yahoo Message Number: 145310RMWhistler said:. I hear there are tankless water heaters but Lazy Dazes don't have them unless somebody switched one. On any Lazy Daze the tank is part of the water heater and the burner is vented to the outside, (not through the roof). So look for a square access door hinged at the bottom, no lock but held shut with a 90 degree turn loop. Vented to outside air with vents at the top of the door. If it has plumbing inside the access panel, its the water heater. Hope that helped.. RonB