Performed a heating pm on an oil furnace. Brushed and vacuumed. Replaced the oil filter, nozzle and strainer. Replaced the Aprilaire 2200 air filter. Started and checked the safeties. Performed a combustion test. System is operating properly. Did not do the maintenance on the water heater. The water heater has a leak in the tank. There are streaks on the side and the insulation is wet under the plug for the anode rod. The water heater needs to be replaced.