Volano UP GBP is an outdoor-rated buffer tank designed to pair with air-to-water heat pumps and hydronic systems where the unit lives outside. Built in mild steel with a tough technopolymer outer shell, it adds the thermal mass you need to stabilize flow and reduce short cycling while standing up to weather.
Key features
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Outdoor-ready construction – Mild-steel vessel with a durable, UV-resistant technopolymer jacket for exposed installations alongside outdoor heat pumps.
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4-connection layout – Two connections for the heat source and two for the system circuit, giving installers straightforward, flexible piping options.
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Compact, wall-hung design – Vertical, wall-mounted form factor keeps patios and service areas clear while providing easy access for service.
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Sized for residential and light commercial systems – Available in multiple volumes from ~7–26 gallons, covering typical single-family homes up to larger multi-zone systems.
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Improves system stability – Adds buffer volume to reduce compressor short cycling, improve defrost performance, and smooth flow in zoned or variable-speed hydronic loops.
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Non-potable hydronic use – Intended for closed heating and cooling loops; not for domestic potable hot water.
Typical applications
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Outdoor air-to-water heat pump systems needing added buffer volume
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Hydronic heating and cooling loops with zoning or variable-speed pumps
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Projects where the buffer tank must live outdoors next to the equipment pad
(See Technical Documents below for full Volano UP GBP technical data, dimensions, and connection sizes in U.S. units.)