large. Although it is just 1.5 kilowatts in capacity, its surface area is the same size as the SU61/2000a. As such, whilst it takes a couple of minutes longer to warm up compared with the best selling SU61/1600, it provides heat to larger areas in more suttle ways. If you find you require a heating capacity of between 1.3kw and 1.49kw, then the SU61/15 is yours. However, if you have no wall space to take in that size of a radiator, then go