Our new house has a back boiler heating system, and I would like to change it to gas central heating. We haven't moved in yet, so we would like to have this completed before we move in (it requires rewiring also). Having never had to buy central heating before could you give me some pointers on the models and types please. Which are most efficient? Which type will give the highest hot water pressure for minimum cash outlay? Is a combi system the best way forward? Thanks in advance for your help.
