An accumulation of water in your heating oil tanks has the potential to cause all sorts of problems to boilers and oil-fired cookers. Water can seep into the tank in different ways, such as damaged vents and caps that allow rain water in, condensation that forms due to daily temperature changes can cause small water droplets to form on the inside of the tank, which can accumulate over time.
Water that then enters the tank will fall to the bottom of the tank and sit under the oil. It is when the accumulation of water builds up to a level that reaches the outlet of the tank that the problems start.
You can check for water in your tank by buying some water finding paste such as Kolor Kut, which can be bought from online stockists. Water finding paste – which comes in either green or red – changes colour when in contact with water.
Simply place some of the paste on a clean stick and dip the stick carefully and slowly in your heating oil tank until it just touches the bottom. Wait about 20 seconds and slowly withdraw it from the tank. If the paste changes colour then you will then have an indication on the depth of the water in your tank. If the paste is spotted, it will indicate that water is held in suspension.
If you experience any problems checking for water then your central heating service engineer should be able to test for water and, if water is found, will arrange to remove it for you.