Thermax vs Cummins India (2026): Margins, Cash Flow, Data Centres & Which Is Better?
Thermax and Cummins India both benefit when Indian industry invests, but their earnings behave very differently when a project goes wrong.
Thermax can spend years designing and executing an industrial boiler or energy project.
A single change in estimated project cost cut ₹91 crore from Q1 FY2027 profitability.
Cummins sells engines, generators, power systems, parts and service through a much shorter operating cycle.
Its Q1 sales grew 18% while PBT margin remained above 21% despite commodity inflation.
That difference in revenue architecture is more important than comparing the companies as generic "capital goods" stocks.
The BullRun Project Risk vs Product Velocity Test
Long-cycle project
Large ticket size and visible backlog, but engineering changes and cost overruns can affect several quarters of profit.
Short-cycle product
Lower backlog visibility, but orders convert to revenue faster and pricing can adjust more frequently.
Installed-base service
Parts and maintenance create recurring demand after the original equipment has already been sold.
Thermax participates heavily in the first model.
Cummins participates heavily in the second and third.
Neither is automatically superior, but the cash-flow and margin behaviour should be valued differently.
Thermax vs Cummins India: Q1 FY2027 scoreboard
| Metric | Thermax | Cummins India | Current Reading |
|---|---|---|---|
| Q1 operating revenue / sales | ₹2,303 Cr consolidated | ₹3,375 Cr standalone | Cummins |
| Revenue growth | +7% | +18% | Cummins |
| Domestic sales | Multi-business project/product mix | ₹2,854 Cr, +22% | Cummins growth visibility |
| Export sales | Meaningful international operations | ₹521 Cr, flat YoY | Different disclosure basis |
| Q1 EBITDA | ~₹69 Cr | PBT used as primary company profitability measure | Thermax severely affected |
| EBITDA margin | ~3.0% | Not directly disclosed in company headline | Definitions differ |
| PBT | ₹42 Cr | ₹721 Cr before exceptional items | Cummins |
| PBT margin | ~1.8% | 21.4% | Cummins |
| PAT | ₹22 Cr consolidated | ₹543 Cr standalone | Cummins |
| Q1 exceptional operating issue | ₹91 Cr project cost overrun | Commodity/inflation pressure | Cummins lower project concentration |
| Thermax order booking | ₹2,809 Cr | No equivalent long-cycle backlog metric | Models differ |
| Thermax order balance | ₹14,045 Cr | Not comparable | Thermax contracted visibility |
| ROCE, Bull Run | 16.55% | 33.71% | Cummins |
| ROE, Bull Run | 13.74% | 29.45% | Cummins |
| Debt/equity | 0.41 | 0.00 | Cummins |
| Current ratio | 1.22 | 3.32 | Cummins |
| 5-year sales growth | 17.42% | 22.73% | Cummins |
| 5-year profit growth | 28.38% | 30.04% | Cummins slightly |
| 5-year FCF | -₹831 Cr | ₹5,144 Cr | Cummins |
| P/E | 91.21x | 65.00x | Cummins lower |
| P/B | 9.75x | 18.16x | Thermax lower |
| Bull Run Score | 50.0/100 | 73.3/100 | Cummins |
Thermax's Q1 is a case study in why project accounting deserves respect
Revenue increased 7% to ₹2,302.7 crore, but PAT collapsed from ₹151 crore to ₹22 crore.
The business did not lose 85% of its customers.
One project became significantly more expensive to complete than management had previously estimated.
Thermax recognised a ₹91 crore increase in expected project cost inside Industrial Infra.
Accounting standards require that deterioration to be recognised when identified rather than waiting until the project physically finishes.
That ₹91 crore charge is not "just accounting"
A cost-to-complete revision represents real economic deterioration in a contract.
Labour, engineering, material, commissioning or scope changes can make an old project less profitable than expected.
The expense may be non-recurring in the sense that the exact same project should not create the same charge every year.
But project-selection and execution risk are recurring features of the business model.
Investors should therefore normalise the quarter carefully without pretending the loss never happened.
Thermax still booked ₹2,809 crore of new orders
Order intake increased 2% year on year.
The order balance reached ₹14,045 crore, up 23%.
This means customer demand remained far healthier than Q1 profit might suggest.
The company has several quarters of revenue visibility across industrial products, infrastructure, green solutions and chemicals.
The immediate question is the margin embedded inside that backlog.
Not every rupee of Thermax backlog is economically identical
A standard boiler product, an industrial EPC project, a long-term green-energy contract and specialty chemicals produce very different margins and cash cycles.
The current business structure includes:
- Industrial Products.
- Industrial Infra.
- Green Solutions.
- Chemicals.
The Q1 loss was concentrated primarily in Industrial Infra rather than every vertical collapsing simultaneously.
Industrial Products remained Thermax's largest segment
Q1 segment revenue was approximately ₹1,058 crore.
Industrial Products includes process heating, cooling, water, pollution-control and related industrial systems.
Segment PBIT was only around ₹64 crore during Q1 as input costs and lower export sales pressured profitability.
The margin problem therefore extended beyond the single Industrial Infra project, although the ₹91 crore project overrun was the dominant exceptional drag.
Industrial Infra was where the real damage occurred
Segment revenue was approximately ₹814 crore and PBIT was negative by roughly ₹71 crore.
A year earlier the segment had produced positive profit.
This shows the operating leverage hidden inside complex EPC.
Large revenue does not guarantee large profit when project estimates move against the contractor.
Thermax still has attractive structural markets
Industrial decarbonisation is not a one-product opportunity.
Customers need:
- Waste-heat recovery.
- Boilers and steam systems.
- Air-pollution controls.
- Water treatment.
- Bio-CNG.
- Renewable energy.
- Energy-efficiency systems.
- Green hydrogen infrastructure.
Thermax's breadth gives it access to customer capex across multiple stages of energy transition.
Data centres appear in Thermax's order book too—but differently from Cummins
Thermax secured a large order exceeding ₹400 crore for boiler pressure parts connected with a US data-centre project during the quarter.
This is an indirect data-centre exposure through energy infrastructure.
Cummins' exposure is much more direct through backup and prime power-generation systems.
That difference matters when investors use "data centres" as a single thematic label.
Cummins India sold ₹1,424 crore of domestic power-generation equipment in one quarter
Power-generation domestic sales increased approximately 35% year on year.
That made power generation almost half of domestic sales.
Data centres have become a major demand source within that business.
Management indicated data centres represented roughly 40% of power-generation revenue during the quarter compared with about 23% a year earlier.
This is a real operating exposure rather than a future aspiration.
Why do data centres still need diesel and gas engines in an electrification era?
Because hyperscale computing cannot tolerate grid downtime.
A data centre may consume renewable electricity over the year and still require high-horsepower backup generators for reliability.
AI computing increases rack density and electrical load.
That increases the amount of backup capacity required.
Cummins therefore benefits from digital infrastructure even though the core product remains an internal-combustion engine.
Cummins is not only a generator manufacturer
The ₹886 crore Distribution business grew 14% year on year.
Distribution includes parts, service, overhaul and support across the installed engine base.
This is economically valuable because the original equipment sale creates future service demand.
Engines need:
- Filters.
- Lubricants.
- Parts.
- Preventive maintenance.
- Overhauls.
- Emergency field support.
The installed base therefore becomes a recurring customer-acquisition asset.
450 service touchpoints create a moat that does not appear on the balance sheet
Management has described approximately 450 service touchpoints and around 3,500 trained engineers across Cummins and its dealer ecosystem.
Critical customers such as hospitals need technicians rapidly when backup power fails.
A competitor can manufacture an engine.
Recreating nationwide service density is much slower.
This network supports customer retention and aftermarket revenue.
Industrial domestic sales reached ₹458 crore
The industrial business grew around 10% year on year.
Cummins engines are used across construction, mining, rail, defence, marine and other heavy applications.
This reduces dependence on data centres and conventional generator demand.
Distribution then monetises those engines across their operating lives.
Exports were the weak part of the quarter
Export sales were ₹521 crore, flat year on year.
High-horsepower exports increased, while some lower-horsepower categories declined.
West Asian geopolitical uncertainty and global demand conditions affected the mix.
Domestic growth was strong enough to offset the lack of export growth.
Cummins' margin softened even though revenue grew 18%
PBT before exceptional items was ₹721 crore with a 21.4% margin, about 70 basis points below the prior-year level.
Commodity inflation and higher costs pressured profitability.
This is an important reminder that a product company does not avoid raw-material risk.
The difference is that product pricing can often be adjusted more frequently than the economics of a multi-year fixed-price project.
₹543 crore of standalone PAT is not the entire Cummins group result
Consolidated PAT was approximately ₹609 crore on consolidated net sales around ₹3,426 crore.
The company's headline press release focuses on standalone results because that is where its primary operating sales breakdown is disclosed.
This article therefore uses standalone figures when discussing domestic, export and PBT-margin performance and does not mix them silently with consolidated Thermax metrics.
The cash-flow comparison is where the business-model difference becomes obvious
Bull Run records approximately ₹5,144 crore of five-year free cash flow for Cummins India versus negative ₹831 crore for Thermax.
That does not mean every Thermax project destroys cash.
Thermax invests in:
- Project working capital.
- Green-energy assets.
- Subsidiaries.
- Long-cycle contracts.
- Manufacturing expansion.
Cummins' product and service model historically converts earnings into cash with much less project-equity intensity.
Cummins also enters the comparison with no meaningful financial debt
Bull Run records debt-to-equity of zero and a current ratio above 3.3.
Thermax debt-to-equity is around 0.41 and its current ratio approximately 1.22.
Thermax's leverage is not extreme.
Cummins simply has an unusually strong industrial balance sheet.
ROCE is almost twice as high at Cummins
Bull Run records Cummins India ROCE around 33.7% versus Thermax around 16.5%.
ROE is roughly 29.5% versus 13.7%.
The difference reflects Cummins' strong margins, installed base, limited financial leverage and efficient product model.
Thermax's project working capital and green-energy investments require more capital per rupee of current profit.
The five-year growth rates favour Cummins too
Cummins' five-year sales growth is approximately 22.7% versus Thermax around 17.4%.
Five-year profit growth is approximately 30.0% versus 28.4%.
Both are strong numbers.
Cummins has achieved the growth with materially stronger cumulative free cash flow.
That gives it the higher-quality compounding profile today.
Cummins is cheaper on earnings even though its current fundamentals are stronger
Bull Run's August 25 snapshot places Cummins at approximately 65x trailing earnings and Thermax at about 91x.
This sounds counterintuitive after Thermax's poor Q1.
The explanation is that Thermax's weak ₹22 crore quarter reduces trailing earnings and mechanically increases P/E.
If the ₹91 crore project overrun does not repeat, future earnings could normalise.
But the cost overrun was real, so it should not simply be deleted from historical profitability.
Price-to-book tells the opposite story
Cummins trades at approximately 18.2x book versus Thermax around 9.8x.
Cummins deserves a higher book multiple because it earns almost 30% ROE.
Thermax currently earns roughly half that.
A high P/B is not automatically expensive when every rupee of equity produces significantly more profit.
The market reacted very differently to the latest quarter
| Market Metric | Thermax | Cummins India |
|---|---|---|
| Price on 25 Aug 2026 | ₹3,999.80 | ₹5,239.50 |
| Market capitalisation | ₹54,122 Cr | ₹1,53,870 Cr |
| 1-month return | -17.38% | -6.45% |
| 3-month return | -12.87% | -13.07% |
| 6-month return | +25.69% | +5.58% |
| 1-year return | +22.26% | +35.02% |
| 52-week high | ₹5,257.19 | ₹6,100 |
| 52-week low | ₹2,742.70 | ₹3,777.30 |
| RSI 14 | 27.50 | 40.30 |
Thermax's Q1 disappointment triggered a much sharper recent de-rating.
Its RSI was below 30 in Bull Run's August 25 snapshot.
Cummins also corrected after results, but the decline was much less severe.
What would change the comparison?
Thermax improves if
- Industrial Infra returns to normal margins.
- No new major cost overruns appear.
- ₹14,045 Cr backlog converts cleanly.
- Industrial Products margin recovers.
- Green Solutions reaches profitability.
- Free cash flow improves.
Cummins improves if
- Data-centre power demand stays strong.
- Distribution keeps compounding.
- Commodity pricing is recovered.
- Exports return to growth.
- Industrial demand remains healthy.
- High ROCE is preserved.
Common risks
- Industrial capex slowdown.
- Commodity inflation.
- Currency volatility.
- Export weakness.
- New technology substitution.
- High starting valuations.
Thermax vs Cummins India: current conclusion
Cummins India currently has the stronger risk-adjusted operating profile.
It combines faster revenue growth, substantially better profitability, higher ROCE, no meaningful debt and much stronger five-year free cash flow.
Thermax has the stronger long-cycle project backlog and broader environmental-solutions portfolio.
But Q1 exposed exactly what investors must monitor in a complex EPC business: one poorly performing project can overwhelm profit from several healthy product lines.
Thermax vs Cummins India FAQs
Which company had higher Q1 revenue?
Cummins India on standalone sales, at ₹3,375 crore versus Thermax consolidated operating revenue of approximately ₹2,303 crore.
Why did Thermax profit collapse?
A ₹91 crore increase in estimated cost to complete one Industrial Infra project materially reduced Q1 profitability.
Which has higher ROCE?
Cummins India at approximately 33.7% versus Thermax around 16.5% in Bull Run's current standardised snapshot.
Which has better free cash flow?
Cummins India. Bull Run records roughly ₹5,144 crore of five-year free cash flow versus negative ₹831 crore for Thermax.
How exposed is Cummins to data centres?
Management indicated data centres represented roughly 40% of Q1 domestic power-generation sales, making them a meaningful current demand driver.
Does Thermax benefit from data centres too?
Yes, but differently. Thermax has supplied energy and boiler-related equipment connected to data-centre infrastructure rather than primarily backup generator sets.
Which is cheaper?
Cummins on current P/E at approximately 65x versus Thermax around 91x. Thermax's P/E is elevated partly because Q1 profit was depressed by the project cost overrun.
Where can investors compare both stocks?
Use the Thermax Bull Run stock page and Cummins India stock page for standardised valuation, financial statements, returns, ROCE and technical data.
Research sources
Disclaimer
This article is educational and informational only. Thermax figures are primarily consolidated while Cummins India publicly highlights standalone sales and PBT metrics, so not every line item is directly comparable. Thermax's Q1 FY2027 result contained a ₹91 crore cost-to-complete revision on one Industrial Infra project. The charge is unusual but represents real project economics and is not simply removed from reported profit. Cummins' PBT margin is not the same accounting metric as Thermax EBITDA margin. Financial results, project estimates, commodity costs and share prices change over time. Nothing here recommends buying, selling or holding Thermax, Cummins India or any security. Bull Run is not a SEBI-registered Research Analyst or Investment Adviser.