My previous post shows I'm having probs. with my current c/h and h/w system and the boiler is getting a bit old (Glow Worm 65-80). How would I replace the existing boiler with a Combi type? Can I tap into the existing c/h and h/w system without too much problem and can I then dispense with the h/w cylinder to give us back some airing cupboard space. AND would you experts out there consider this a good move? Thanks!