As we head into the colder months, many households across Leinster arrange a large winter fill of heating oil. For older plastic tanks, this can be the most dangerous time of year. After a hot summer, tiny micro-cracks can form in weakened tanks. Once the weather turns cold and the tank is filled to the top, the extra weight and pressure can cause the tank to split and start leaking. A simple check now can save you thousands in clean-up costs and protect your home and garden from an oil spill.
Why winter is a risky time for older oil tanks
Most people only think about their oil tank when they are ordering a fill, but winter puts extra stress on an ageing tank:
If your tank has been sitting through years of hot summers and cold winters, the material can become tired and weakened. A tank that looks “grand” from a distance can fail suddenly once it is filled.
- Cold weather makes brittle plastic more likely to crack.
- A winter fill usually means the tank is filled close to the top.
- Extra weight increases pressure on weak spots and micro-cracks.
If your tank has been sitting through years of hot summers and cold winters, the material can become tired and weakened. A tank that looks “grand” from a distance can fail suddenly once it is filled.
How summer heat can damage your plastic oil tank
Even in Ireland, strong sun and higher temperatures in summer can cause:
These micro-cracks are often invisible to the eye. You may notice nothing at all until you order a large winter delivery and the tank is put under pressure. That is when a split and leak are most likely to happen.
- Expansion and contraction of the plastic wall
- UV damage to older tanks with faded or chalky surfaces
- Formation of tiny micro-cracks, especially around corners and fittings
These micro-cracks are often invisible to the eye. You may notice nothing at all until you order a large winter delivery and the tank is put under pressure. That is when a split and leak are most likely to happen.
Warning signs your oil tank may not survive a winter fill
Before you book a delivery, it is worth taking a quiet ten minutes to look over your tank. Watch out for:
If you see any of the above, it is safer to have the tank checked or replaced before a full winter fill. A small issue now can become a very costly leak later.
- Bulging or out-of-shape sides
- Deep discolouration, crazing or very faded plastic
- Hairline cracks, especially around outlets, lids and moulded seams
- Wet patches or dark staining under or behind the tank
- A base that is uneven, cracked or sinking on one side
If you see any of the above, it is safer to have the tank checked or replaced before a full winter fill. A small issue now can become a very costly leak later.
Why a proper base is just as important as the tank
A sound tank needs a sound base. An uneven or weak base puts extra stress on the tank wall and can shorten its life. We regularly see:
As part of our work, we prepare a proper base for the new tank to sit on. This helps:
A good base is not just “nice to have” – it is a key part of a safe, long-term installation.
- Old blocks or paving slabs that have shifted over time
- Cracked, narrow or sloping concrete pads
- Tanks sitting partly on soil or timber
As part of our work, we prepare a proper base for the new tank to sit on. This helps:
- Distribute the weight evenly
- Reduce movement and twisting of the tank
- Extend the life of the tank and connections
A good base is not just “nice to have” – it is a key part of a safe, long-term installation.
Carbery tanks: single-skin and bunded options
When replacing a tank, the quality of the new tank matters. We supply and install Carbery tanks, a trusted brand widely used in Ireland. We can provide:
For many homes, a bunded tank is now the recommended option, especially where a spill could reach drains, streams, neighbours’ property or flowerbeds you care about. We can explain the differences on site and help you choose the safest, most sensible option for your home.
- Carbery single-skin tanks – suitable in certain locations where regulations allow and where risk is lower.
- Carbery bunded tanks – a “tank within a tank” design that offers extra protection if the inner tank leaks.
For many homes, a bunded tank is now the recommended option, especially where a spill could reach drains, streams, neighbours’ property or flowerbeds you care about. We can explain the differences on site and help you choose the safest, most sensible option for your home.
Our oil tank services across Leinster
We provide a complete service for domestic heating oil tanks across Leinster, including:
You can learn more about our services on our home page and see where we work on our
service areas page.
We cover the Leinster region, including Dublin, Meath, Kildare, Wicklow, Louth and surrounding counties.
- Old oil tank replacement
- Oil tank relocation to a safer position
- Full oil tank removal and environmentally responsible disposal
- Preparation or upgrading of the tank base
- Transferring usable oil where possible and handling sludge safely
You can learn more about our services on our home page and see where we work on our
service areas page.
We cover the Leinster region, including Dublin, Meath, Kildare, Wicklow, Louth and surrounding counties.
When to call a professional
You should speak to a specialist if:
Replacing a tank before it fails is far cheaper – and far less stressful – than dealing with an oil spill, clean-up and possible issues with insurance.
If you are unsure about your existing oil tank, get in touch. We can assess your current set-up, prepare a proper base and install a suitable Carbery single-skin or bunded tank, so your home is safely heated for many winters to come.
- Your tank is more than 15–20 years old
- You see any signs of bulging, cracking or leaking
- The base has moved, cracked or sunk
- You are planning a big winter fill and are unsure about the tank’s condition
Replacing a tank before it fails is far cheaper – and far less stressful – than dealing with an oil spill, clean-up and possible issues with insurance.
If you are unsure about your existing oil tank, get in touch. We can assess your current set-up, prepare a proper base and install a suitable Carbery single-skin or bunded tank, so your home is safely heated for many winters to come.
