50 Years Of Trust | Engineering The Next Energy ERA
50 Years Of Trust | Engineering The Next Energy ERA
ISOTEX Hot Oil Boilers deliver safe, precise, and high-efficiency thermal oil heating using furnace oil, light diesel oil, natural gas, or LPG — eliminating steam pressure hazards while achieving operating temperatures up to 300°C for demanding industrial processes.
Purpose-built for industries demanding precise, uniform, and continuously adjustable process heat, ISOTEX Hot Oil Boilers combine advanced burner technology, multi-pass coil design, and SMARTWIZ IoT automation to deliver exceptionally stable thermal oil temperatures with minimal operator intervention.
As a complete turnkey solution — from burner and firebox through thermal oil coil, expansion vessel, pump set, control panel, and SMARTWIZ monitoring — every Hot Oil Boiler is factory-assembled and pre-commissioned at our Ahmedabad facility before dispatch, ensuring rapid, reliable site installation.
ISOTEX Hot Oil Boilers — part of the Ecotherm Series — deliver high-temperature process heat through clean oil or gas combustion, circulating thermal oil as the heat transfer medium at temperatures up to 300°C. Unlike steam boilers, hot oil systems operate at near-atmospheric pressure even at high temperatures — dramatically improving safety and eliminating the risk of high-pressure steam explosions in the plant.
ISOTEX Ecotherm Hot Oil Boilers are available across a comprehensive capacity spectrum — from 4 Lac kCal/hr to 25 Lac kCal/hr — designed to meet diverse industrial high-temperature process heating requirements from single-process units to large multi-consumer thermal oil systems.
| Parameter | Value / Range | Unit / Notes |
|---|---|---|
|
Heat Output Capacity |
4,00,000 – 25,00,000 |
kCal/hr |
|
Max. Thermal Oil Outlet Temp. |
Up to 300°C |
Standard Operating |
|
Max. Thermal Oil Outlet Temp. |
Up to 320°C |
Custom / On Request |
|
Thermal Efficiency |
Up to 87% |
On NCV Basis (BS 845) |
The ISOTEX Unitherm Thermosyphon Boiler is available in multiple firing configurations, offering unmatched fuel flexibility across solid, liquid, and gaseous fuels to match every industry’s availability, cost, and emission requirements.
GCV ~3,000–3,200 kCal/kg
~2,100–2,400 kCal/kg (dry);
GCV ~3,200–3,800 kCal/kg
~4,200 kCal/kg
High-calorific agro-waste, from groundnut processing in Gujarat and Andhra Pradesh; excellent fuel quality with low ash content — ideal for hot oil systems near edible oil processing clusters.
GCV 3,800–4,500 kCal/kg
Densified agro-waste pellets (rice husk, mustard stalk, cotton stalk), automated feeding, clean combustion, and ease of storage — premium biomass fuel for solid-fuel hot oil systems.
GCV ~3,500–4,000 kCal/kg
GCV 4,500–5,500 kCal/kg
Imported thermal coal with consistent, low moisture, low ash — most widely specified coal grade for FBC and stoker-fired hot oil systems in chemical, polyester, and polymer plants.
GCV 3,500–4,500 kCal/kg
Domestic coal from CIL sources, (GCV basis); cost-effective fuel for large-capacity hot oil systems where biomass availability is limited — FBC combustion recommended for high-ash Indian coal grades.
GCV ~2,800–3,400 kCal/kg
Low-rank coal from Rajasthan and Tamil Nadu lignite fields, high moisture content requires FBC or dumping grate combustion — very low cost per kCal for plants in lignite-producing regions.
GCV ~2,800–3,400 kCal/kg
Char and coke by-products from steel and chemical plants; combustible industrial waste streams available at low cost — engineered combustion systems designed for high-fixed-carbon, high-ash solid fuels.
ISOTEX solid-fuel-fired hot oil systems use proven combustion technologies — selected based on the specified solid fuel characteristics, required capacity, and emission compliance requirements.
For wood chips, coal, briquettes, and larger biomass fuels; robust mechanical grate design for continuous solid fuel feeding with consistent combustion — capacities 4 to 15 Lac kCal/hr.
For wood chips, coal, briquettes, and larger biomass fuels; robust mechanical grate design for continuous solid fuel feeding with consistent combustion — capacities 4 to 15 Lac kCal/hr.
Optimised for fine biomass fuels: rice husk, paddy straw fines, and agro-dust — prevents grate blockage from fine particles while maintaining efficient combustion and consistent thermal oil temperature.
Heavy-duty system for high-moisture, high-ash biomass: wet bagasse, green crop waste, and high-silica agro-residue requiring extended residence time for complete combustion.
ISOTEX proprietary multi-fuel combustor handles mixed biomass and coal — switching between solid fuels without combustion system modification for maximum fuel procurement flexibility.
Advanced bubbling fluidised bed for biomass pellets, mixed agro-waste, and high-moisture biomass — efficiency up to 85% on NCV basis with consistent combustion across variable fuel quality.
Built to Perform. Proven In the Field. Explore real ISOTEX Precision Thermal Oil Heater, installations showcasing proven capability across edible oil, pharmaceutical, chemical, and process industries.
High-Capacity Precision Thermal Oil Heater for Plywood Industry in Haryana
3000000 kcal/hr × 3
Petcoke / coal
Thermal Oil Heater for Industry in Punjab
4000000 kcal/hr
Sander dust, wood chips, wood waste
High-Pressure Thermosyphon Boiler for Polyfilms Industry in Haryana
4000000 kCal/hr
LDO/GAS
Precision Thermal Oil Heater for Industry in India
1500000 kCal/hr
Natural Gas – Ldo
Our engineering team responds within 24 hours. Share your capacity requirements and fuel preference. We’ll engineer the right solution.
