Drainback Systems

• Solar fluid is water with an anti-corrosive additive. The fluid drains back from the collectors when the pump is not operating.
• Protected from overheating in summer as well as freeze damage in winter, the system can be sized for space heating (more collectors and larger heat exchanger) in addition to water heating.
• Larger pump is needed for solar loop, so drainbacks are slightly louder than pressurized systems.
• Low maintenance (fluid level and buffer content should be checked at least every two years).

For design and tax credit information, owner’s manuals, and other information, see our Library page.