Tuffa 3500 Litre Bunded Oil Tank

Product Code: 3500VB
Manufacturer: Tuffa Tanks

This bunded oil storage tank from Tuffa comes with a substantial 3500 litre (769 Gallons) capacity and is ideal for domestic, commercial and industrial oil storage. It is bunded meaning...

Full description

Available Options (Prices ex.VAT)

Optional 1" BSP Top Outlet: (optional)

Optional Lockable Cabinet: (optional)

Delivery Requirement:

£2,465.80 ex. VAT
£2,958.96 inc. VAT
Delivery Lead Time:
5-6 weeks
Delivery Cost:
£188 + VAT


This bunded oil storage tank from Tuffa comes with a substantial 3500 litre (769 Gallons) capacity and is ideal for domestic, commercial and industrial oil storage.

It is bunded meaning it is designed as a tank within a tank. This offers extra protection for the oil and for the environment around it. The inner tank holds the oil while the outer tank offers leak-protection and holds 110% of the total amount of liquid being stored.

In the unlikely event of the inner tank splitting, the outer tank retains the contents and protects the surrounding area from potentially-costly pollution. The strong, protective layer provided by the bund makes the tank stronger for reliable oil storage as well as inhibiting the build-up of rainwater and debris.


  • 3500 litre capacity
  • UV stabilised and recyclable polyethylene construction
  • Corrosion resistant
  • Manufactured in the UK
  • Bund contains a minimum 110% volume of the inner tank
  • Bunded construction offers integral protection from leaking and overfilling
  • Covered bund prevents the collection of rainwater and debris
  • Overfill prevention device
  • Watchman Sonic gauge
  • Lockable hinged flap lid on outer tank provides easy access and additional security
  • 10 year warranty
  • Optional lockable cabinet complete with battery bund, overfill alarm and upgraded % hydrostatic gauge
  • Optional 1" BSP Top Outlet available as an alternative

It is manufactured in the UK from a premium grade of Medium Density Polyethylene (MDPE) which is recyclable, rust resistant and UV stabilised.

Users will benefit from the Watchman Sonic gauge which remotely monitors the amount of fuel in your oil storage tank and wirelessly transmits the reading to an indoors receiver meaning you don’t have to go out in the cold to establish your fuel level. When the level is below 10 per cent, the fuel dispensing pump symbol appears on the receiver as a reminder to order more oil.

The tank is also equipped with an automatic shut-off overfill prevention device which prevents any further fluid from being dispensed once the maximum capacity has been reached. The lockable hinged flap lid affords easy access to the tank and provides an additional security element.

This tank comes supplied with a 10 year warranty for your peace of mind.

Optional Extras 

An optional lockable cabinet is available which comes equipped with a battery bund and high-quality overfill alarm which is designed to detect overfill, low liquid levels and provide an early warning of a breach in the bund layer of the tank. An upgraded % hydrostatic gauge is also included.


  • 2″ BSP Fill Connection with cap and chain
  • Vent
  • 1″ BSP Bottom Outlet (1" BSP Top Outlet available as an alternative)
  • Tank Colour: Green


All Bunded Oil Tanks are fully compliant with all applicable requirements contained within The Control of Pollution (Oil Storage) (England) Regulations 2001, The Water Environment (Oil Storage) (Scotland) Regulations 2006 and comparable requirements throughout the United Kingdom. 

Unsuitable for the storage of fuel for supply to vehicles and / or plant equipment via gravity fed fuel delivery systems incorporating a flexible hose and trigger nozzle. 

Please note that all Bunded Oil Tanks should only be installed by a suitably competent person e.g. an OFTEC Registered Oil Tank Installation Technician in accordance with supplied instructions and statutory requirements. To find your local OFTEC Registered Oil Tank Technician, please click here.


Tank Specifications

Height - mm
Capacity - Litres
Capacity - Gallons
Weight - kg
Diameter - mm

Tuffa Bunded Oil Tanks - FAQ's

What is a bunded oil tank?

A bunded tank uses a "tank within a tank" design. The inner tank is used to store the oil which is then enclosed in a secondary container which acts as the bund. The bund will protect your oil in the event of the inner tank splitting and has the ability to hold 110% of the inner tank's contents. They are considered to be the safest way to store heating oil and have become the industry standard with OFTEC installers.

What materials are used in their construction?

Tuffa tanks are manufactured in the UK from tough, UV stabilised and recyclable polyethylene. This has excellent chemical and impact resistance properties, making it ideal for external fuel storage.

When installed, how is the tank filled with oil?

Each Tuffa Bunded Oil Tank is supplied with a 2″ BSP Fill Connection with cap and chain. When your oil supplier arrives at your location, they will simply connect their fill pipe to this inlet and dispense the oil into your tank. It provides a safe and secure fill point for your tank.

How can I check and monitor the amount of oil in the tank?

Tanks in this range come fitted with either a float level gauge or Watchman Sonic Electronic Gauge. All tanks supplied with a float level gauge can be upgraded to a Watchman Sonic gauge.

The float level gauge uses a float connected to a level display which indicates the fuel level along with a secondary measure of the fuel quantity in the clear inner tank.

The Watchman Sonic gauge uses a tank mounted transmitter which wirelessly transmits the reading to an indoors receiver meaning you don’t have to go out in the cold to establish your fuel level.

Installation - OFTEC Requirements

Who are OFTEC?

OFTEC establishes the standards for competence within the domestic oil heating and cooking industry. By ensuring the quality of people and businesses working in this area, OFTEC maintains standards for reputable companies and consumers alike.

What is an OFTEC approved installer/engineer?

They are a trained and approved competent person who is approved by OFTEC to install and service domestic and commercial oil tanks. Your oil tank must be installed by an OFTEC engineer and to maintain the 10 year warranty the tank must be inspected every year.

Tank location - OFTEC guidelines

Oil tanks are required to comply with fire separation distances in order to adequately protect the stored fuel from a fire or heat source, that may originate nearby. Tanks should be sited:

  • 1.8m away from non-fire rated eaves of a building
  • 1.8m away from a non-fire rated building or structure (e.g. garden sheds)
  • 1.8m away from openings (such as doors or windows) in a fire rated building or structure (e.g. brick built house/garage)
  • 1.8m away from oil fired appliance flue terminals
  • 760mm away from a non-fire rated boundary such as a wooden boundary fence
  • 600mm away from screening (e.g. trellis and foliage) that does not form part of the boundary

If it is impossible to comply with these requirements, then a fire protection barrier with at least 30 minutes fire rating should be installed, please call us for more details. A minimum separation distance of 100mm is required between the tank and fire-rated barrier.

Tank base and support - OFTEC guidelines

The need to provide a suitable base and support for your oil tank is of paramount importance for reasons of both safety and environmental protection. The base should be:

  • Adequate for the weight of the tank
  • Non-combustible, imperforate and level
  • Constructed of concrete, paving stones or stonework
  • Large enough to extend 300mm beyond all sides of the tank

If an oil storage tank is not adequately supported, the tank itself can be weakened leading to the eventual failure and escape of the stored fuel. During the life of an installation, an oil storage tank base will need to provide continual structural support, even though ground conditions may alter from season to season and year to year.

To comply with British Standards, the base material should be one of the following laid on a hardcore base to give an imperforate base:

  • Concrete at least 100mm thick
  • Paving stones at least 50mm thick
  • Stonework at least 50mm thick

The overall size of the base should be larger than the oil storage tank and any integral oil storage tank bund, so that when the oil storage tank is installed, the base has a clear projection of a minimum of 300mm around all sides of the oil storage tank.