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AET Solar Water Heater Complete Drainback System
Closed Loop (Indirect) System for Cold Climates

AET solar water heaterThe Alternative Energy Technologies (AET) AE Series Drainback has been designed to be a complete solar appliance that incorporates ease of installation and maximum efficiency for years of trouble-free service. The Drainback system uses the sun’s energy to heat your water, reducing your electricity consumption. The Drainback will pay for itself many times over the life of the system. All installations require a connection to your home water system.

Since only thermally efficient pure water is used, maximum safety and performance is assured. The Drainback system is ideally suited to cold regions with many freezing days each year or areas with aggressive water conditions. Freeze protection is provided by draining the collector loop liquid back into the drainback reservoir when the system is not operating. The simplicity of the drainback method provides reliable operation that makes this system an asset to any home located in the colder climes.

AET Drainback System consists of:

  • Collector(s)
  • Drainback reservoir
  • Storage tank
  • Heat exchanger
  • Circulation pump(s)
  • System controller
  • Pre-engineered system

AET Indirect (Closed Loop) Drainback Models:

DB Drainback - The system collects heat by circulating water between the reservoir, collectors and a heat exchanger wrapped around the base of the storage tank.

download pdf DB Drainback Manual
View DB system layout

DX Drainback -
Unique drainback reservoir with built-in heat exchanger. This allows the use of a lightweight glass-lined storage tank. This system collects heat by circulating water between the reservoir and collectors and simultaneously, between the storage tank and the heat exchanger inside the reservoir. Includes 2 pumps.

download pdf DX Drainback Manual
View DX system layout

DBS Drainback -
The system collects heat by circulating water between the reservoir, collectors and a heat exchanger wrapped around the base of the storage tank. It has a single wall heat exchanger and one circulating pump/control combo.

download pdf DBS Drainback Manual
View DBS system layout

Drainback Systems Benefits

  • More efficient than glycol systems
  • Low roof load
  • Positive freeze and overheat protection
  • Panels last longer
  • Fewer problematic components
  • Saves you money - Reduces your monthly utility costs
  • Saves the environment - Reduces fossil fuel consumption
  • Adds value to your home - Recapture the initial cost of the system by creating equity in your home
  • Highly efficient nonpolluting alternative energy source
  • The only household appliance that will pay for itself 4 times during its useful life


  • Sloping of the collector and piping array
  • Larger pipe diameter & pump

Product Applications:

  • Suitable for single application domestic hot water
  • Designed for cold areas where freezing can occur

Product Features:

  • Integrated pre-assembled system for easy installation
  • Installation instructions and diagram
  • Includes all necessary components needed for project
  • Works on sunny or cloudy days with electrical backup
  • Attractive collector design
  • Conforms to national plumbing, electrical and solar standards 
  • Automatic controller alerts the pump when to run
  • Exceeds Energy Star criteria, delivers maximum credit toward
  • Energy Efficiency Compliance
  • Tanks are available in 66, 80 and 119 gallon sizes
  • Integrates easily with existing systems

Product Warranty

Manufacturer warranty for individual components apply. See product warranty card for details or request warranty information from sales representative.

  • AE Collector - 10 Year Limited Manufacturer Warranty
  • Storage Tank - Six Year Limited Manufacturer Warranty

System Components

Air Vents
download pdf Air/Coin Vent 125 PSI, 1/8" MPT
download pdf Air Vent 150 PSI, 1/4" MPT

Drain/Tempering Valves

download pdf Boiler Drain 1/2" or 3/4" MPT
download pdf Tempering Valve 3/4" Swt, 110-145° F

Flow Control Valves
download pdf Ball Valve 1/2" or 3/4" Swt
download pdf Spring Check Valve 1/2" or 3/4" FPT

download pdf Pressure Gauge 100 PSI, 1/4" MPT
download pdf Thermometer 35-250°F, 1/2" MPT

Relief Valves
download pdf Pressure Relief Valve 150 PSI, 3/4' MPT
download pdf Temp and Pressure Relief Valve 150 PSI, 3/4" MPT

download pdf 10k Thermistor Sensor Bolt/Strap-on
download pdf 10k Thermistor Sensor Immersion, 1/2" MPT

download pdf Expansion Tank 2.0 Gal, 1/2" MPT

Coolie Hat Flashings 1/2" or 3/4"

Only a qualified person or someone thoroughly familiar with standard plumbing and electrical practices should do the installation. If you have questions on the proper methods to make these connections, consult a qualified plumber or solar contractor for prescribed methods in your area. In most cases your installing solar contractor is familiar with the codes and their application. The codes are intended to protect the health, safety, and welfare of the public.

This product is currently being added to this site. For more information please contact

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