Quick Nautic Calorifier- Made entirely of Argon welded stainless steel, this calorifier has high density polyurethane foam insulation between the cover & the tank for excellent heat retention. Features:• Heat exchanger with wide exchange surface• Electric element is fitted with an adjustable safety bi-thermostat• Relief/non return valve to allow discharging of water when not in use• Heating element made of Incoloy• All calorifiers have 1/2" BSP fittings Available in: 15 Ltr• Diameter: 300mm• Length: 405mm• Weight (empty): 7kg• Heating Element: 1200W• Voltage: 230V 20 Ltr• Diameter: 300mm• Length: 505mm• Weight (empty): 8.1kg• Heating Element: 1200W• Voltage: 230V 25 Ltr• Diameter: 300mm• Length: 605mm• Weight (empty): 8.5kg• Heating Element: 1200W• Voltage: 230V 30 Ltr• Diameter: 360mm• Length: 495mm• Weight (empty): 10.5kg• Heating Element: 1200W• Voltage: 230V 40 Ltr• Diameter: 360mm• Length: 620mm• Weight (empty): 10.5kg• Heating Element: 1200W• Voltage: 230V An optional Mixing Valve Kit is available to regulate the outlet water temperature.( Part No. 830476)