When it comes to solar hot water heaters, they can be either active or passive. But the active systems are most commonly used solar water heating systems. Active systems utilize pumps, whereas passive solar systems operate on gravity or thermosiphons. However, Northern Lights Solar Solutions provides active solar water heating systems with closed loop, pump, and digital controllers ensuring smooth operation. Remember that a solar water heating system can do more than just heat hot water. With the latest technology, solar evacuated tubes, these heating systems can be used in many applications like home heating, space heating, solar air conditioning, commercial solar heating, etc.