Hi. Im looking for a high output radiator for my lounge. I want to heat the 6.2m wide x 4.2m long x 2.4m high lounge with a single radiator. The calulators say i need around 10-12000 btu. The area to place it is a max 180cm long and 80cm high. So far the only one i have come up with is the stelrad K3. But its a triple and im not sure how far that will stick out. Any other radiators to look at or tips on this? thanks.