We have a 2003 Vista Cruiser with an Instant-Flow Tankless Hot water heater. We use it year round. The water heater increases tank water temperature by 24 degreesâ€”not warm enough in the cold months. I am considering replacing this 2400 watt\15amp breaker heater with a 3600 watt/30 amp heater to increase water temp by 49 degrees, but I am not sure if the increased wattage will be compatible with the electrical system. My other option is a Mini tank heater (6 gal.) with less of power demand. Suggestions?