If you have discovered water in your oil tank, it can be worrying. However, in most cases the water has not entered the tank before or during a fuel delivery. Home heating oil suppliers take strict measures to ensure your fuel arrives clean and water-free. The key is to understand how water gets into an oil tank, how to identify it, and what to do about it before it causes costly boiler problems or environmental damage.
Water has an extremely low solubility in home heating oil. If even a small amount of water were present and dispersed throughout the fuel, the oil would appear hazy rather than clear and bright. This would immediately fail the British Standard quality requirements for heating oil.
Professional suppliers also take strong preventative measures, including:
This means the most likely source of water in your oil tank is local — not from the delivery process.
There are two primary causes of water in domestic oil tanks: rainwater ingress and condensation.
Rainwater can find its way into a tank when:
Any breach of the tank structure can allow water to run directly into the fuel, where it will sink to the bottom as water is heavier than oil.
Condensation is a natural process caused by changes in temperature. When the surrounding air is warmer than the oil inside a cold tank, moisture can form on the internal surfaces and drip into the fuel. This is especially common when:
The more air space inside the tank, the more condensation can form.
Several warning signs may indicate the presence of water:
Routine checks can help detect the problem early.
If water is present, quick action can help prevent damage.
The simplest removal method is pumping the water from the bottom of the tank using a hand pump. The extracted liquid will be contaminated and must be disposed of correctly at a local authority waste oil collection centre.
There are alternative methods depending on the amount of water and tank type. You can read more here:
How to check and remove water accumulation from your home heating oil tank
Once the water is removed:
This work is usually best carried out by a professional heating engineer.
If the water accumulation is caused by tank damage or component failure, this must be repaired before any further deliveries are made. A tank that may leak or rupture must not be refilled under Environment Agency regulations.
If your storage tank is still under warranty, contact the installer or manufacturer to report the issue and request a repair or replacement.
Reducing the risk of water ingress will protect your heating system over the long term. Prevention methods include:
A trained tanker driver will also ensure that all openings are securely closed after each delivery as part of standard safety training.
Leaving water in an oil tank can cause:
Fast removal and corrective repairs safeguard both your heating system and the environment.
Removing water or contamination from an oil storage tank is a specialist service and requires correct waste handling under environmental legislation. Barton Petroleum can assist with:
A small service charge may apply depending on the work required.
If you need help with water in your oil tank, contact one of our depots and our team will support you with a reliable and efficient solution.
Source: Oil Save
Barton Petroleum offer a full range of oil tank services to keep your system safe and operational.
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