The 30 Ltr external volumiser is designed for installation with Grant heat pumps when the combined volumiser/low-loss header cannot be fitted inside.

• A simple vessel that increases the volume of the system
• Has just two connections - one inlet and one outlet, and it must be fitted in the flow from the heat pump if the volumiser contains an immersion element that is to be used as a supplementary heater
• Supplied to sit behind the heat pump
• Weatherproof casing and insulated designed for external installation
• Connected to the flow from the heat pump into the flow of the system
• Supplied complete with 3kW supplementary heater and relay