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The Grant Vortex Eco External 15-21 21kW Heat Only Boiler Oil VTXOMECO15-21 is a high-efficiency condensing oil boiler designed for external installation where indoor space is limited. Manufactured by Grant, this floor-standing heat only boiler delivers a 21kW output, making it suitable for small to medium-sized properties using a traditional heating system with a separate hot water cylinder. It features a durable powder-coated casing for weather resistance, a patented stainless steel heat exchanger and a Riello low NOx burner for efficient performance. With built-in frost protection, quiet operation and a factory-fitted multi-directional flue, it offers reliable and flexible outdoor heating.