Closed Circuit Solar Water Heater

Solar water heating primary circuit.

Closed circuit solar water heater.

A drain back solar system is a non pressurized volume of water in a closed circuit that as the name implies drains back from the panels down to a storage tank at the end of every heating cycle. The advantage of a drain back system is built in freeze and overheating protection. Gmoi series family has 150l 200l and 300l solar hot water system. The heat exchanger is filled with closed circuit fluid and is connected to the solar collectors forming a closed circuit.

A closed water heater system means that the hot water cannot expand beyond the valves and mix with the municipal water. The down side is two heat sources. Collectors array closed circuit pump and expansion tank regulation heat exchanger. Closed systems are often used in second homes or primary residences in areas prone to long power outages.

The valves that are usually found in the closed systems are the check valve pressure reducing valve mixing valve backflow preventer and other. The closed circuit series solar water heaters have a means of controlling the maximum temperature of the water in the storage tank. The premier loline replaces water in the panels with a special heat exchange fluid with anti freeze properties. Gmoi series roof top solar water heater.

This water heater is an indirect solar hot water system with a heat exchanger in the solar storage tank. If freeze protection is an issue than a closed system with anti freeze is a good idea. All water heaters waste heat energy even when the burner is off and the unit is sitting idle between heating cycles. The closed circuit fluid is propylene glycol concentrate mixed with water.

This water heater is a closed circuit solar hot water system with a heat exchanger in the solar storage tank. These systems may be installed with a hartstat valve located between the hot outlet of the collectors and the inlet to the tank heat exchanger. Gmoi series is a roof mounted closed circuit solar water heater designed to provide economic service it is suitable for frost prone or harsh water chemistry areas.