Product Highlights 9 year warranty A-rated boiler 26.1kW central heating output 28kW hot water output 12.1L/min hot water flow rate Dimensions (mm) - 712 x 440 x 255 Stainless steel heat exchanger The Evoke 28kW combi boiler is a wall mounted condensing unit which is ideal for small to medium homes that don't have excessive need for hot water. With it being a combi boiler it is ideal for homes where space is limited because of it's compact design. It can fit in a standard sized kitchen cupboard. The unit is classed as an A-rated boiler due to its 93% efficiency rating. The Evoke NX 28kW has a low electrical consumption which results in lower running costs.