How to Choose an IBR Steam Boiler Manufacturer in India (What the Boilers Act, 2025 Requires)

Two quotes land on your desk for a 5 TPH steam boiler. One is ₹6 lakh cheaper. Both say “IBR”. Which one do you trust?

Here’s the uncomfortable truth: the word “IBR” on a quotation doesn’t tell you much. What matters is whether the design was approved, whether certified welders did the job, whether an inspecting authority checked the boiler during manufacture, and whether you can legally register and run it once it’s installed. Get any of that wrong and you can end up with a boiler you’re not allowed to use.

This guide walks through what the law now requires, the steps from factory floor to a registered boiler, and the questions to put to any IBR steam boiler manufacturer in India before you sign.

Quick answer: An IBR steam boiler is a regulated boiler under the Boilers Act, 2025. It must be built from an approved design by certified welders, inspected by an authorised inspecting authority during manufacture and erection, and registered with the state’s Chief Inspector of Boilers before you use it. The registration certificate is granted for no more than 12 months at a time.

The law changed in 2025. Here’s what that means

For decades, people talked about “IBR” and meant the Indian Boilers Act, 1923 and the Indian Boiler Regulations, 1950. That has moved on. The Boilers Act, 2025 received the President’s assent on 4 April 2025 and came into force on 1 May 2025, repealing the 1923 Act [1][2].

You’ll still hear “IBR”, and it still works as shorthand. The Act’s savings clause keeps existing rules and regulations in effect until new ones replace them, so the Indian Boiler Regulations continue to apply in practice for now [1]. The government has also published draft rules under the new Act, so check the current position with your state boiler inspectorate before you finalise anything [3].

What counts as a “boiler”?

The Act defines a boiler as a pressure vessel in which steam is generated for use outside itself. It then excludes three kinds of vessel [1]:

• one with a capacity below 25 litres (measured from the feed check valve to the main steam stop valve);
• one with design and working pressure below 1 kg/cm²; and
• one in which water is heated below 100°C.

Anything that falls outside those exclusions is a regulated boiler: the boiler, its economiser, superheater, steam piping and fittings all come under the Act [1]. A boiler designed below the exclusion limits is what the industry calls a Non-IBR boiler. For a plain-English comparison, read our guide to IBR vs Non-IBR boilers.

From factory floor to running boiler: the six steps

This is the part most buyers never see until something goes wrong. Here is the path the Act sets out [1]:

A few details from the Act worth knowing:

• Timing is built in. After you apply, the Inspector fixes an examination date within 30 days (or a shorter state-set period) and must give you at least 10 days’ notice. The Inspector’s report goes to the Chief Inspector within 7 days of the inspection [1].
• There is a provisional route. While the Chief Inspector’s order is pending, the Inspector may allow the boiler to be used under a provisional order for up to six months, at a stated maximum pressure [1].
• The register number must be permanently marked on the boiler after registration [1].
• Renewal has a clock too. A competent person must inspect within 15 days of a renewal application. If you applied before the certificate expired, you can keep running at the certified pressure while the renewal is pending [1].

Plan these inspections into your project schedule. They depend on inspectors and boiler-house readiness, so they are the most common source of delay.

What a manufacturer must be able to show you

The Act puts specific conditions on anyone who builds a boiler. Before manufacture, the premises need the design and construction facilities set out in regulations, the design must be certified, materials must conform to specifications, and welders must hold certificates [1]. A manufacturer must also engage an inspecting authority before it starts building [1].

That gives you a practical checklist. Ask any IBR steam boiler manufacturer to show you, in writing:

1. The design and drawing approval for the boiler you are buying, from an inspecting authority.
2. Material test certificates for plates, tubes and fittings, traceable to your unit.
3. Welder certificates for the people who welded the pressure parts.
4. The inspecting authority’s name and the stages at which it will inspect.
5. The hydrostatic test record and the certificate of inspection and stamp, once issued.
6. The mountings list: safety valves, main steam stop valve, water level gauges, pressure gauge, feed check valve and blow-down valve.
7. Who handles erection inspection and registration paperwork, and what the price includes.

A manufacturer who is happy to share these before you pay is a good sign. One who stays vague, or says “IBR” without naming the inspecting authority, is a warning.

What happens if you skip it

The Act is clear that an owner can’t use a boiler unless it is registered, the owner has the certificate or a provisional order, and the boiler is not run above the maximum pressure on that certificate [1]. The penalties are real [1]:

• Using a boiler without the required certificate, or above the permitted pressure, can attract a penalty of up to ₹1 lakh, plus up to ₹1,000 for each further day the breach continues.
• Making a structural alteration without the Chief Inspector’s authorisation, or tampering with a safety valve so it won’t work at the permitted pressure, is punishable with up to two years’ imprisonment, a fine of up to ₹1 lakh, or both.
• Accidents must be reported in writing to the Inspector within 24 hours.

The certificate also stops being valid in certain situations: when an accident occurs, when the boiler is moved (with limited exceptions), or after a structural alteration, among others [1]. Treat the certificate as something you actively maintain, not a one-time document.

Sizing an IBR steam boiler: a worked example

Steam boilers are specified by output (TPH, or kg/hr) and working pressure. Thermokrupp’s IBR steam boiler range covers 1 to 10 TPH at 10.54 to 17.5 kg/cm² working pressure, in wood fired and external furnace solid fuel designs.

To understand fuel cost, convert steam to heat. Making 1 kg of steam from feed water at about 30°C takes roughly 630 kcal at these pressures. So a 5 TPH boiler needs about 31.5 lakh kcal/hr. Here is what that means in fuel and cost. These prices and heating values are assumptions to show the method, so replace them with your own:

Fuel cost per tonne of steam is the number to compare when choosing between boiler designs. Wood is cheaper per unit of heat in this example, but it brings storage, handling, labour and ash disposal costs, and it needs a bigger furnace. Our wood fired boilers and coal fired steam boilers suit plants with cheap solid fuel, while oil and gas fired boilers suit sites with a gas line. For a wider fuel comparison, see our industrial heating system guide.

Also decide working pressure vs design pressure early. Working pressure is what you run at. Design pressure is the higher rating used for the thickness calculations, safety valve settings and hydrostatic test, so it affects the plate thickness and price.

Don’t forget everything around the boiler

The boiler is only part of a steam system. Heat recovery and good distribution decide how efficient your plant really is. Ask about an air preheater, a condensate recovery system, a proper steam distribution system, an industrial chimney and a dust collector for solid fuels. If you have hot exhaust available, a waste heat recovery boiler can turn it into steam. For a neutral benchmark on industrial energy efficiency, see the Bureau of Energy Efficiency [4].

After commissioning, keep the boiler legal and efficient with scheduled boiler maintenance (AMC), genuine boiler mountings and prompt boiler repair. Under the Act, repairs must follow set conditions, including certified welders and approval by a competent person [1].

IBR or Non-IBR? A quick decision guide

• Need larger or continuous steam loads, or steam at higher pressure? A shell-type boiler of that size is normally a regulated IBR boiler. The deciding factor is the boiler’s design water capacity, not its output, so ask for it in writing. See our IBR steam boiler manufacturer page, where the range starts at 1 TPH.
• Need a few hundred kilos an hour, with fast start-up and light paperwork? A Non-IBR boiler or coil type boiler may do. Read our Non-IBR boiler buying guide and the baby boiler buying guide.
• Not sure? Send us your steam load and pressure. We’ll tell you which category applies and put it in writing.

Why talk to Thermokrupp

We build our boilers at our factory in Dadri, Gautam Budh Nagar, close to Noida, Greater Noida and Ghaziabad, and we have served industry since 2017 (see about us). We state the applicable approvals and statutory inspection steps for your boiler in writing, so you know what you are buying before you commit. If you are comparing manufacturers, our guide to the top boiler manufacturers in India can help you shortlist, and our industrial steam boiler overview covers the wider range.

Frequently Asked Questions

What is an IBR steam boiler?
An IBR steam boiler is a regulated steam boiler under the Boilers Act, 2025: a pressure vessel that generates steam for external use, with a capacity of 25 litres or more at a design pressure of 1 kg/cm² or more. It must be built from an approved design, inspected during manufacture and erection, and registered before use.

Is the Indian Boilers Act, 1923 still in force?
No. The Boilers Act, 2025 came into force on 1 May 2025 and repealed the 1923 Act. Existing rules and regulations, including the Indian Boiler Regulations, continue to apply until new ones are made under the 2025 Act.

Who inspects an IBR steam boiler?
An inspecting authority checks the boiler during manufacture and erection. After you apply for registration, a state Inspector examines it and the Chief Inspector registers it. Later renewals are inspected by a competent person.

How long is a boiler registration certificate valid?
The Chief Inspector may authorise use for a period not exceeding 12 months at a time, so the certificate must be renewed. Apply for renewal before it expires so you can keep running while the renewal is pending.

What happens if I use an unregistered boiler?
Using a boiler without the required certificate, or above the permitted pressure, can attract a penalty of up to ₹1 lakh plus up to ₹1,000 for each further day. Tampering with a safety valve or making unauthorised structural changes can lead to imprisonment of up to two years, a fine of up to ₹1 lakh, or both.

What documents should an IBR steam boiler manufacturer give me?
Ask for the design and drawing approval, material test certificates, welder certificates, the inspecting authority’s certificate of inspection and stamp, the hydrostatic test record, and the list of mountings. Get the regulatory status of your specific boiler in writing.

Does moving a registered boiler cancel its certificate?
Generally yes. A certificate ceases to be in force when the boiler is moved, with limited exceptions such as small vertical boilers with a heating surface under 20 square metres. A boiler moved between states must also be reported.

Need an IBR steam boiler sized for your plant?

Share your steam load (kg/hr or TPH), working pressure, fuel and location, and our engineers will recommend a configuration and tell you which approvals apply.

Call: +91 85109 23806 / +91 99119 35013
Email: sales@thermokruppboilers.com
Factory: Kh No -12, Bisnoli, Tehsil Dadri, Gautam Budh Nagar, Uttar Pradesh 203207
Request a quote · See our IBR steam boiler range

Sources

1. The Boilers Act, 2025 (Act No. 12 of 2025), Gazette of India Extraordinary, 4 April 2025. Definitions (section 2), manufacture, inspection and registration (sections 6 to 17), penalties (sections 27 to 30), repeal and savings (section 45). An official copy is also available from India Code.
2. Boilers Act, 2025 to come into effect from 1st May. Reports the commencement notification issued by the Ministry of Commerce and Industry (DPIIT).
3. Draft Rules under the Boilers Act, 2025, Department for Promotion of Industry and Internal Trade.
4. Bureau of Energy Efficiency, Government of India.

This article is a general guide, not legal advice. Boiler rules and fees can change through notifications and differ by state, so confirm the current requirements with your state boiler inspectorate.