Peter Stuckey The website provides a tool to assess the size of heaters required. Ian Glover on the phone was most helpful and clarified queries quickly. Ordered 2 economiser radiators for a conservatory with insulated solid roof. Delivery was as agreed and quality and finish of radiators good. Easy to fit by diy. The radiators appear to work well and keep a very stable temperature. Cost appears extremely competitive! I had previously received a quote from a well known company that insist on home assessments and demonstrations. EHE were a quarter of the cost for virtually identical products. 5 October 2018