Our present combi boiler is 670mm high, 435mm width and depth 280mm and needs replacing. We would like to keep it in it's present position, but it's in a small kitchen and we don't want to loose our worktop space, so the maximum would want a new boiler to be is 690mm high, 445mm width and 320mm depth. We have seven radiators on the system. Our engineer favours Worcester Bosch and Valliant, but will install whatever we want, so just wondering if there's anything smaller others can recommend.