Designed and manufactured by Navien, the NCB 28kW Combi gas boiler is a wall-mountable unit that comes with a high-efficiency rating of 93% and ErP A rating.
With a 28kW output rating, the Navien NCB is the perfect size for medium-sized homes that don’t have an excessive need for heating and hot water. In addition to this 28kW model, the NCB range also includes 24kW, 34kW and 40kW units. The 24kW model is the best option for smaller homes with 1 bathroom and not such a high demand for heating and hot water. If you live in a large home, with 2 or more bathrooms, then you should consider the 24kW or 40kW NCB boilers.
The Vortex Pro Internal Combi 26kW oil boiler is a highly reliable condensing unit which has been designed and manufactured by Grant as a floor standing boiler. As a Combi boiler it will supply hot water and heating on demand by using the mains water supply. This means you don’t need to have bulky tanks or cylinders making it perfect for smaller homes.
This model has a high efficiency rating of 89.5% making it an A rated boiler and, with an output rating of 26kW, is perfect for the smaller homes with not such as high demand for heating or hot water. It includes a variety of features including a 24 litre expansion vessel, neon diagnostic indicators, high efficiency circulating pump, the unique Grant Vortex stainless steel heat exchanger and Riello RDB burner with plug and socket connections. The 4 litre expansion vessel that is normally located behind the front door of the boiler this is supplied as an externally fitted vessel kit.
The Greenstar 18/25 Heatslave II is the UK’s most popular oil combi boiler with a flow rate of 22 litres per minute.
Suitable for various sized properties , the Heatslave II 18/25 boiler features easy access connections for installation piece of mind. The Heatslave II also includes the next generation heatronic 4i digital control unit which provides accurate control and diagnostic information.
The Logic+ provides amazing value for money and is one of the only boilers in the UK to receive Quiet Mark accreditation for its quiet operation.
One of Worcester Boschâ€™s most popular boilers. This has been the gold standard from Worcester for quite a while with WHICH Best Buy status.
The newest boiler on this list. This is the premium option with a whopping 12 year guarantee when installed by EBC with a filter.