Hi All. My son is in the middle of a loft conversion that involves an ensuite. His current CH boiler is gravity fed from a tank in said loft. As he needs some heat up there, the builder has said he will have to have electric rads due to them being on the same level as the tank. (or technically slightly higher) Is this right? If so, could he get around this by just raising the tank a metre or so? I had it in my head that once the boiler was fed, the pump sent the flow around to wherever the rads were irrespective of where the system was fed from. Or is this just sealed systems. Thanks.