A dual fuel burner lets your boiler or furnace run on two different fuels — typically natural gas and light diesel oil (LDO), or gas and furnace oil — and switch between them automatically or manually.
If your gas supply is cut, restricted, or priced out for a day, the burner switches to oil and your plant keeps producing instead of shutting down.
If you run a boiler, thermic fluid heater or furnace on natural gas alone in India today, you may have experienced a supply notice from your gas distributor, a sudden price spike, or curtailment during peak demand. Plants that depend on a single fuel have no fallback. Plants running on a Riello dual fuel burner, supplied and serviced by Suntec Energy Systems, have an alternative fuel option.
India’s Petroleum and Explosives Safety Organisation framework and gas transmission rules provide for gas curtailment and supply prioritisation during shortages. Industrial and commercial gas users may be affected by supply restrictions. When that happens, a single-fuel gas burner can mean a stopped production line. A dual fuel burner can make fuel changeover possible instead of a complete shutdown.
What Is a Dual Fuel Burner, in Plain Terms?
A dual fuel burner is a single burner unit built with two separate fuel trains — one for gas and one for liquid fuel (light oil, heavy oil or furnace oil) — sharing the same combustion head, blower and control panel.
Riello’s RLS series, which Suntec distributes and services across India, is designed for dual fuel operation. Depending on the model, it supports two-stage or fully modulating operation on either fuel, with changeover managed through the burner’s control logic rather than by physically swapping equipment.
One Burner, Two Fuels
Use two fuel sources with one burner unit instead of operating two separate burners or storing a spare unit.
Planned Fuel Changeover
Depending on the model and site configuration, trained plant staff can switch fuels through the control panel.
Designed for Both Fuels
A properly selected and commissioned burner can deliver its rated output on each supported fuel.
Why This Matters More in 2026
Three trends are important for Indian industrial energy users when evaluating fuel flexibility.
1. Gas Supply Uncertainty
LNG import disruptions, pipeline maintenance and domestic allocation priorities can affect the availability of gas for industrial consumers.
2. The Need for an Alternative Fuel
Plants without dual fuel capability may need to arrange alternative heating arrangements when gas supply becomes restricted. A suitable dual fuel system provides another operating option when the required infrastructure is ready.
3. The Cost of Production Downtime
For process industries such as textiles, food processing, pharmaceuticals and chemicals, lost production during a boiler or furnace shutdown can be significant.
Together, these considerations make fuel flexibility a risk-management decision, similar to planning for standby power.
Is a Dual Fuel Burner Right for Your Plant? Four Questions to Ask
1. Do You Currently Run on Gas Only?
If you have no liquid fuel storage or feed line, conversion requires additional planning. Oil storage, a feed line and possibly civil work may be needed. Suntec’s team can assess the requirements during a site visit.
2. Do You Already Have Oil or Gas Infrastructure?
If you already have an oil-fired burner and an idle or underused gas connection, or the reverse, the existing infrastructure may simplify the project.
3. What Is Your Production Loss During a Shutdown?
Estimate the impact if your boiler or furnace stops for 24–48 hours. Suntec’s application engineers can help assess the operating requirements for your specific plant.
4. Can Your Existing Burner Be Converted?
Not every existing burner is suitable for a dual fuel retrofit. Riello’s RLS series is purpose-built for dual fuel operation, which may be a more suitable option than modifying a single-fuel unit in the field.
What a Dual Fuel Conversion or Installation Involves
Suntec Energy Systems has supplied and serviced Riello burners in India since 1989, with a service network across 30+ cities and neighbouring countries, and has completed over 1,50,000 installations to date.
A typical dual fuel project involves these six steps:
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Site Assessment
Review the existing fuel setup, boiler or furnace specifications, required output and available gas and oil infrastructure. -
Burner Selection
Select the appropriate RLS model and capacity for the equipment and its operating requirements. -
Fuel Train and Safety Design
Plan the gas train, oil pump, feed line, interlocks and compliance with applicable safety requirements. -
Installation and Commissioning
Installation and commissioning are carried out or supervised by the technical team. -
Operator Training
Prepare plant staff to carry out fuel changeover procedures safely and confidently. -
Ongoing Service
Arrange routine maintenance and technical support through the regional service network.
Frequently Asked Questions
Does a dual fuel burner lose efficiency compared to a single-fuel burner?
No, not when correctly selected and commissioned. A well-matched dual fuel burner is engineered to deliver its rated efficiency on each fuel independently. Fuel flexibility does not inherently mean reduced combustion performance.
How quickly can a plant switch fuels during a gas curtailment?
On a properly commissioned system, changeover is typically a control-panel procedure that trained plant staff can carry out in minutes. The site must be prepared with adequate fuel stock, ready valves and trained operators.
Can an existing single-fuel burner be converted to dual fuel?
Sometimes. Suitability depends on the boiler or furnace, available space and the existing burner configuration. In many cases, a purpose-built dual fuel unit such as the Riello RLS series may be more reliable than a field conversion. A site assessment will confirm the options.
Is dual fuel only relevant for large industrial plants?
No. Hotels, hospitals, food processing facilities, textile units and mid-sized manufacturing plants may also benefit wherever a heating shutdown has a significant operational cost. The appropriate burner depends on the required capacity and application.
The Bottom Line
Single-fuel dependence can be a business risk for industrial plants in India. A dual fuel burner does not eliminate every supply risk, but it can provide an alternative operating fuel when gas is unavailable and the required fuel infrastructure is in place.
For many industrial operations, the difference between a production shutdown and a planned fuel changeover can be significant.
Need a Dual Fuel Burner for Your Plant?
Talk to a Suntec application engineer to assess whether your plant is suitable for a dual fuel burner and understand what installation or conversion would involve for your equipment.
Talk to an Application Engineer
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