If your radiators seem lukewarm or your hot water tap is dispensing tepid water, it is likely that your appliance is faulty another warning sign is if your radiators keep turning on and off all day an inefficient boiler costs more money to run, as firing the appliance up burns the most energy. Great customer service! very trustworthy people!! I just have to say that the quality of service was excellent and [your technician]. Your service men are.