Solar Water Heating Drain Back System

Draining the collector and piping.

Solar water heating drain back system.

The drain back tank ships without a heat exchanger for use with a solar water heater with an internal heat exchanger. There are variations among the variations. The advantage of a drain back system is built in freeze and overheating protection. High performance easy construction with simple materials long life and low maintenance all for a price that is about 1 7th of.

There are many types of solar hot water systems pressurized closed loop pressurized open loop drain back thermosyphon and variations called direct and indirect referring to the placement of the heat exchanger. 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. Objectives for the system are. It s ultimately up to you and your project needs but our system does not need to have a drainback system installed in it in order to work.

The way our solar water heater is designed it can be mounted 90 degrees so the water will drain naturally out of the copper tubes. If you own this type of system have a solar heating professional check it periodically. Drain back systems have fewer components than pressurized systems making drain back systems easier to use service and maintain. Understanding solar hot water systems the drain back design.

The solar drain back tank comes in seven models ranging from ten gallons to 80 gallons. The two dominant types today are the pressurized glycol system and. Drain back systems are a smart choice when designing a solar thermal system to supplement central heating and domestic hot water components. The drainback solar water heater is not the simplest and it requires some knowledge time and money to design and build it properly.

Draindown or drainback systems typically use a controller to drain the collector loop automatically. It can also be purchased with or without a heat exchanger. Drainback system is one of the popular solar water heating systems whose main advantages over other types are reliability simplicity and low maintenance.