Hi folks My wife and I have take over an old radar station on the Isle of Man on the side of the mountain. We're planning on turning it into a motorbike cafe as it's right on the TT course and I'm looking for some advice on heating the place. It's bloody huge at around 560sqm, built of cavity double thick walls, block and beam roof and absolutely no insulation.... We've been exploring every conceivable heating option air source, wind, solar thermal, solar electric, gas, electric, etc etc and we've come to the conclusion that the most cost effective (funds are draining rapidly) is to perhaps install a conventional oil boiler system with cast iron radiators (probably not the most efficient but look the part) and perhaps low velocity fans to keep the warm air down (ceiling height is nearly 4m). Obviously we'll be getting professionals in to fit the system but given the huge amount of knowledge on tap here I thought I'd see what you folks thought. I've read a similar thread that mentions smart pumps, thermal stores etc but I'm not entirely sure what they are. There's a pie and mash dinner for the best advice!!