My father's looking into replacing his G-Rated boiler under the scrappage scheme but is worried about costs. The current system comprises an open vented boiler downstairs in the middle of the late 50s house which exhausts into a single-walled metal flue in the central chimney. There are air bricks in the kitchen to facilitate air intake by the boiler. There are 3 rads downstairs and a further 6 upstairs all fed by a single pipe system with surface mounted 1/2 inch copper pipework. Is there a sensible cheap fix or does he need to replace the whole lot.... and would the £500 govt contribution (Wales) make much of a dent in the final total? Regards Steve