A drainback system is a solar water heating design where the heat‑transfer fluid drains back into a reservoir when the pump stops. This protects the system from freezing and overheating without antifreeze, improving reliability in a wide range of climates.
/ˈdreɪnˌbæk ˈsɪstəm/
A drainback system is a solar water heating design where the heat‑transfer fluid drains back into a reservoir when the pump stops. This protects the system from freezing and overheating without antifreeze, improving reliability in a wide range of climates.
What is a drainback solar system?
It’s a system that drains fluid back to a reservoir when not running, preventing freeze or overheat damage.
Source: The Cooling Company
Fluid drains back when circulation stops for protection.
A home solar thermal system uses a drainback tank so collectors empty at night, preventing freeze damage.
Ensure piping slopes correctly so all fluid drains back to the reservoir when the pump is off.
“Ensure piping slopes correctly so all fluid drains back to the reservoir when the pump is off.”
Drainback systems solve freeze protection without glycol antifreeze.
Do drainback systems need antifreeze?
No. The system drains when off, preventing freezing without glycol.
Can drainback systems overheat?
They reduce overheating risk because the collectors empty when not circulating.
Are drainback systems maintenance‑heavy?
They are relatively low‑maintenance but require proper slope and periodic checks.
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