Keston Boiler Review

Built a reputation for innovative heating solutions, particularly its unique twin-flue technology. Acquired by Ideal Heating in 2006 and manufactured in Hull since 2013, Keston specializes in high-efficiency combi boilers tailored for domestic and light commercial use. In 2025, Keston’s Combi 2 range, including the C30 and C35, stands out for its flexibility and compact design, catering to modern UK homes. Keston combi boilers deliver instant hot water and central heating without a separate storage tank, ideal for space-limited properties like flats or small houses. The C30 (30kW) and C35 (35kW) models, with flow rates of ~12–14 liters per minute, suit homes with 1–2 bathrooms and up to 15–20 radiators. Featuring stainless steel heat exchangers, they achieve A-rated efficiency of ~89.6%, reducing energy bills. Their twin-flue system, extendable up to 27 meters, allows installation in challenging locations, such as basements or internal rooms, unlike conventional boilers restricted to external walls. Compact (700mm x 395mm x 278mm) and wall-mounted, they fit kitchen cupboards, with sleek aesthetics enhancing modern interiors. Smart features like weather compensation, Halo thermostat compatibility, and an intelligent pre-heat function optimize efficiency and comfort. Installer-friendly with push-and-clip flue connections, they offer 5–7 year warranties when fitted with a Keston filter. While praised for flexibility, some Trustpilot reviews (3.3/5 from 36 users) cite reliability issues, such as error codes or heat exchanger problems, and inconsistent after-sales support. Best for small to medium homes, larger properties with high hot water demands may require Keston’s system boilers. In 2025, Keston remains a niche but versatile choice for unique installation needs, backed by British manufacturing and eco-conscious design, including 20% hydrogen-readiness.