Open Loop Systems are suitable for single application domestic hot water (DHW) systems, in mild and moderate climates. One or two tanks can be used in various configurations and they retrofit easily into existing systems. An Open Loop System is for climates where there is no risk of freezing. Recirculation freeze protection can be provided by the Recirculation feature in the controller. At about 42ºF. the pump will turn on for a short time, circulating the water through the loop and preventing freezing. 

NOTE: The information presented in this page is for guidance only - no part of this may be used for any agreement, whether expressed or implied, or to form any contract. THERMO TECHNOLOGIES reserves the right to change specifications and prices without prior notice.

• Easy to retrofit to existing tank with minimum disturbance of existing piping.
• Versatile system - the preheat tank can be located away from the conventional tank.
• Useful if the conventional tank is gas or oil fired. Many gas fired DHW tanks have high standby heat losses and will waste solar energy.
• The "pretank" is usually cold in the morning and ready to receive solar energy.
• Good control over the system and easily monitored performance.
• Efficient if the house is occupied through the day. Solar heated water will frequently be drawn into the conventional tank, helping offset standby losses.
• A well insulated standard DHW electric tanks is mass produced and reasonably priced.
• This solar system can be disassembled easily, leaving the existing system intact, and moved to another location.