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Gas Fired Steam Boiler

Evolution  |  1,000 – 6,000 kg/hr  |  Up to 95% Thermal Efficiency

The cleanest, most efficient steam solution for gas-connected process industries — delivering maximum performance with minimum emissions.

Installations
0
Thermal Efficiency
Up to 0 %
Max Capacity
Up to 0 TPH

IBR / ASME

Certified Design

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PRODUCT OVERVIEW

Gas Fired Steam Boiler —Evolution

ISOTEX Evolution Gas Fired Steam Boiler represents a breakthrough in clean, high-efficiency steam generation — delivering up to 95% thermal efficiency through the combination of advanced European burner technology, integral economiser heat recovery, and intelligent automation syste.

Gas firing offers the cleanest combustion profile of any fossil fuel, producing near-zero sulphur dioxide, minimal particulate emissions, and the lowest CO₂ per unit of steam generated. For process industries connected to natural gas pipeline infrastructure, the  gas boiler is the definitive choice for maximum efficiency, reliability, and environmental performance.

As a complete factory-assembled, plug-and-play solution — from burner and boiler shell to economiser, feed water system, and PLC control panel — every  unit arrives pre-commissioned and tested, minimising on-site installation time and cost.

TECHNICAL SPECIFICATIONS

Capacity Range & Performance Data

ISOTEX evolution gas fired steam boilers are available in five standard capacities from -200 to -800, covering 2,000 to 8,000 kg/hr, engineered to meet diverse industrial process steam requirements with consistent, stable output.

Parameter Value / Range Unit / Notes
Steam Output Capacity
1000 – 6,000
kg/hr.
Design Pressure Range
10.54 / 17.5
kg/cm²(g)
Thermal Efficiency
Up to 83%
On NCV Basis
Dryness Fraction
≥ 98%
Guaranteed
Boiler Series
Evolution
Factory-assembled modular design

*Efficiency 95% ±2% measured to BS 845 Part 1, Indirect Method. Custom capacities and higher-pressure designs available on request — contact our engineering team.

*Isotex gas fired steam boilers are available up to 8 TPH (-800). Higher-pressure designs (up to 21 kg/cm²) and custom capacities available on request — contact our engineering team.

95%

Thermal Efficiency

Industry-leading efficiency achieved through special X-ID heat transfer tubes and integral economiser system — reducing fuel consumption and operating costs from day one.
1,500 — 6,000 kg/hr
Capacity Range
Five standard capacities covering small to large process steam requirements. Custom engineering available for specific process demands beyond standard range.
≥ 98%
Dryness Fraction — Guaranteed
Guaranteed dryness fraction ensures consistent, high-quality dry steam — critical for pharmaceutical, food processing, and precision chemical applications.
Fuel Flexibility

Gas Fuel Options & Flexibility

ISOTEX gas fired steam boilers are engineered with advanced Riello monobloc burner technology, optimised for natural gas and gaseous fuel variants available across India’s pipeline and industrial gas infrastructure.

Primary Gas Fuel Options

Propane / LPG

High-calorific liquefied petroleum gas at ~11,900 kCal/kg; compatible with burners with dedicated LPG conversion kit — ideal for areas without natural gas

Bio-Gas / Bio-Methane (Optional)

Renewable gaseous fuel from anaerobic digestion or municipal waste gasification; carbon-neutral combustion when using certified bio-methane sources

Dual Fuel — Gas / LDO (Optional)

Automatic changeover between natural gas and Light Diesel Oil backup; ensures uninterrupted steam supply during gas curtailment or supply interruptions

Natural Gas (Pipeline / PNG

The primary fuel; clean pipeline natural gas at 8,500 kCal/Nm³ delivers maximum combustion efficiency, near-zero SO₂, and lowest CO₂ per unit steam generated

Compressed Natural Gas (CNG)

For sites using CNG cylinders or cascades without pipeline access; same combustion performance as PNG with compressed storage flexibility

LNG (Liquefied Natural Gas)

Cryogenic storage option for high-capacity, remote, or future-proofed gas installations; highest energy density in liquefied form with regasification skid

Advanced Monobloc Burner — Gas Combustion Technology

The  gas boiler incorporates the world-renowned Riello (Italy) electronic regulation monobloc burner — delivering precision gas combustion with industry-leading turn-down and modulation capability:

  • Riello Italy gas burner — world’s largest burner manufacturer, field-proven in 100+ countries
  • Digital Burner Management System (B) with full gas valve train, UV flame sensor, and auto-purge sequencing
  • High turn-down ratio 1:5 — gas valve modulates from 20% to 100% load without on/off cycling, eliminating thermal shock
  • Gas pressure proving system with automatic leak detection — full safety interlock before every startup
  • Compatible with natural gas, LPG, and bio-gas with burner head selection at order stage
ENGINEERING ADVANTAGES

Technology Advantages of the Evolution Gas Boiler

The Evolution brings large-system performance to a compact, factory-assembled package — delivering class-leading efficiency, precision control, and smart automation for gas-fired process steam applications.

01

Special Design Integral Economiser

  • Up to 6% increase in thermal efficiency through flue gas heat recovery — pre-heats boiler feed water before entry to drum
  • Total system efficiency up to 95% NCV basis — industry benchmark for gas fired steam boilers
  • Factory assembled and insulated as one unit — no site-erected economiser, no additional civil work or pipework
  • Up to 40% reduction in total boiler footprint compared to separate economiser syste
  • Self-cleaning design with low gas-side pressure drop — minimal maintenance and no performance degradation over time
  • Gas pressure proving test before every startup — safety interlock prevents firing under low-pressure or leak conditions
  • Optional LPG / dual-fuel (gas + LDO) conversion for maximum operational flexibility

02

Special X-ID Heat Transfer Tubes

  • +85% more heat transfer vs standard plain fire tubes — CFD-optimised internal ribbed geometry creates turbulence without excessive pressure drop
  • +50% more soot resistance than plain tubes — critical for gas applications where efficiency maintenance defines long-term operating cost
  • Turbulence without excess pressure drop — ribbed internal design balanced through CFD simulation for optimum heat transfer coefficient
  • Reduced cleaning frequency and lower annual maintenance cost — soot resistance means fewer tube brushing intervals
  • Extended service life: ribbed design distributes thermal stress evenly — longer tube life between replacement cycles

03

Advanced PLC Control System with HMI Touch Screen

  • Full-colour HMI touch screen display with intuitive operator interface — no specialist training required for daily operation
  • Smartphone remote control & modification — adjust set points, view alar, and monitor performance from any location
  • PC browser / smart device communication ports — SCADA integration and remote engineering diagnostics capability
  • Complete data logging with access control — full operating history, alarm records, fuel consumption, and efficiency trends on demand
  • On-screen alar with acknowledgement and corrective action prompts — reduces response time and minimises downtime
  • SMARTWIZ IoT integration ready — 24/7 cloud monitoring and predictive maintenance alert platform for remote fleet management
Return On Investment

ROI Analysis: ISOTEX Gas Fired Boiler vs Standard 85% Efficiency Gas Boiler

Operating Parameter

Value

Steam capacity

4,000 kg/hr

Annual operating hours

7,000 hrs

Fuel type

Natural Gas (PNG / CNG)

Gas calorific value

8,500 kCal/Nm³

Natural gas consumption

267 Nm³/hr

Annual gas cost at (95% efficiency)

₹58.7 Lakh

Annual gas cost — standard 85% efficiency boiler

₹65.5 Lakh

Annual fuel cost saving (95% vs 85% efficiency)

₹6.8 Lakh / year

Economiser additional saving (up to 6% extra efficiency)

₹3.9 Lakh / year

Total annual savings vs standard gas boiler

₹10.7+ Lakh / year

Typical payback on efficiency upgrade

2.5 – 3 Years

₹6.8 Lakh Per Year

Total Annual Savings

Combined fuel efficiency savings and economiser benefit per 4 TPH plant operating 7,000 hours per year on biomass.

2.5 – 3 Years

Typical Investment Payback

The efficiency upgrade pays for itself within 2.5 — after which the savings go directly to your bottom line for the life of the plant.

₹58.7 Lakh

Annual Gas Fuel COst

The efficiency upgrade pays for itself within 2.5 — after which the savings go directly to your bottom line for the life of the plant.
Field Performance

A Glimpse of ISOTEX Gas Fired Steam Boilers in Operation

Built to Perform. Proven in the Field. Explore ISOTEX gas fired steam boiler installations across leading process manufacturing plants.

Gas Boiler for Plywood Industry in Noida

Capacity

3000 kg/hr.

Fuel

Natural Gas

Gas Boiler for Pharma Industry in Gujarat

Capacity

2000 kg /hr. – 10.54 kg/cm²

Fuel

FO

GasBoiler for Textile Industry in Gujarat

Capacity

1500 kg/hr

Fuel

PNG/LPG

High Capacity Gas Boiler in Textile Industry in Telangana

Capacity

4000 kg /hr. , 10.54 kg/cm²

Fuel

Natural Gas

View Cast Studies
Field Performance

Customer Testimonial Videos & Animation

Watch our customers share their experience with Isotex Gas Fired Steam Boilers:

Isotex Steam Boiler Textile Industry

Isotex Steam Boiler Pharma Industry

Resources

Technical Downloads & Documentation

📋
Ecobloc CS - Sales Catalouge
Full technical specifications, GA drawings and fuel data — everything needed for engineering evaluation.
Download PDF
🌐
ISOTEX Global Company Profile
Global installation reference list and client testimonials across 75+ countries and 13 industry sectors.
Download PDF
🏆
Incomparable References
Global installation reference list and client testimonials across 75+ countries and 13 industry sectors.
Download PDF
🔍
Free Energy Audit Request
Request a free energy audit of your existing boiler — identify efficiency gaps and calculate upgrade savings.
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