Grant Boiler Review

Grant Engineering Ltd offers a versatile range of high-efficiency condensing combination boilers that heat water directly from the mains on demand, doing away with separate hot-water cylinders or cold-water tanks and saving valuable space in modern UK homes. Manufactured in Ireland to rigorous BS EN standards, Grant combi boilers employ advanced stainless-steel heat exchangers and low-NOₓ burners to achieve SEDBUK efficiencies of up to 94%, reducing fuel consumption, energy bills and carbon emissions. Outputs span from 18 kW to 36 kW, with corresponding domestic-hot-water flow rates between approximately 9 l/min and 17 l/min to meet peak demand. Key models include the Grant VortexBlue 18 (18 kW, ~9 l/min), VortexBlue 24 (24 kW, ~12 l/min), VortexBlue 30 (30 kW, ~15 l/min) and VortexBlue 36 (36 kW, ~17 l/min), alongside the VortexPro 25 (25 kW, ~13 l/min) which adds fully modulating electronic controls for precise heating output. All units feature compact dimensions (roughly 720 mm × 440 mm × 340 mm), quiet operation below 45 dB and built-in frost protection and weather compensation options for consistent performance year-round. Easy-access internal components and standardised pipe-and-flue connections simplify installation and servicing, making them a cost-effective choice for Gas Safe-registered engineers. Backed by up to a seven-year manufacturer’s warranty with annual servicing, plus UK-based technical support and a nationwide spares network, Grant combi boilers deliver dependable central heating and instant hot water while helping homeowners manage running costs, improve EPC ratings and minimise environmental impact.