Avoid Northern Gas,what a terrible experience from beginning to end.Day one wrong boiler ordered,fitted December After short time half radiators not working,told to bleed radiators,did not work,did not come for weeks to sort it out,without heat over Christmas.Bad communication by staff including managers get phone call to say over run on previous job - car van broken down etc. They phone to make new appointment and then they phone to change it.I phoned the manager Mr Ali four days on the run,but no communication from him at all. :Do not do business with Northern Gas unless you want problems and stress.