Bolt-on skids that turn air-compressor heat into hot water for small factories
TL;DR Exhaustwell fits a standard heat-recovery skid to the screw air compressors in small factories and pipes the captured heat into process or boiler-feed water. The factory pays per unit of heat delivered, or leases the skid. It works because nearly every compressor throws away most of its power as heat.
A screw compressor is really a heater that happens to make compressed air. One big compressor maker says 94% of the energy a compressor uses ends up as heat[1], and the DST innovation portal notes that 70% of motor power can be recovered as useful heat[2]. In most small plants that heat just goes out through a fan.
Meanwhile the same plant is often burning diesel, LPG or wood to heat washing, dyeing, plating or boiler feed water a few metres away. Funny, right?
Recovery equipment exists, but small firms face high upfront cost, integration worries, scarce maintenance skills and paybacks that can stretch over several years[3]. So the heat stays wasted.
Reframe. The seed proposed a distributed network moving waste heat between sites. Sharing heat across firms needs neighbours with matching demand, long contracts and pipe rights, and few Indian clusters can offer that. So we kept the goal and moved the mechanism inside the fence.
Exhaustwell builds two or three standard skid sizes matched to common compressor sizes, each with a plate heat exchanger, pump, valves and heat meter. A technician fits one in a day, tapping the compressor's oil circuit and feeding an insulated tank. The heat meter measures every unit delivered and a small dashboard shows the fuel avoided each month.
Because the skids are standard, Exhaustwell can stock them, train local compressor service dealers to fit them and finance them on its own balance sheet. The factory signs up to pay a per-unit heat price set below its current fuel cost, or a fixed monthly lease. Low-temperature heat is the limit - this suits processes that need water at 50–80°C, not steam.
The factory owner pays, usually after the plant engineer shows them the saving. Target the sectors already heating water - textile processing, food, electroplating, pharma and dairy.
A per-unit price below fuel cost lets the owner save from month one without spending any capital. There's no public price for heat-as-a-service to Indian MSMEs, and my assumption is you set it 15–25% below the fuel it replaces.
The ADEETIE scheme, launched in July 2025 with a ₹1,000 Cr outlay, gives micro and small firms a 5% interest subvention on energy-efficiency loans and pays for audits and post-implementation verification across 60 clusters[4]. That makes small recovery projects easier to fund. Larger firms already buy recovery systems from established suppliers[5], so the tech is proven.
There's no public figure for compressor heat recovery in Indian MSMEs. Adjacent: ADEETIE expects ₹6,750 Cr of MSME lending across 14 energy-intensive sectors[4].
The physics sets the opportunity per site, since a 37 kW compressor running two shifts gives off close to its rated power as heat[1]. Count compressors in a cluster before you count rupees.
An Indian heat-recovery startup sells compressor and chiller heat recovery and lists big consumer-goods and two-wheeler makers as customers[5]. Compressor makers sell energy-recovery units for its own compressors[1]. Local fabricators build one-off heat exchangers.
The gap is a standard, metered, pay-per-unit product sold to small firms with a single compressor, through the dealers who already service them.
| Difficulty | Hard (52/100) |
| Starting capital | ₹1.2–2.2 Cr |
| Time to launch | 9–12 months |
The engineering is known. Capital and field work are the hard parts, because you fund skids before the heat bills come in and working capital eats the budget. Every plant has odd piping and its own hot-water use, and a skid that ever makes a compressor trip on high temperature will be ripped out the same week.
No special licence to sell heat, as long as you keep it as unpressurised hot water.
Building this outside India? The categories above usually have a local equivalent, so check with your own regulator.
Don't let a model decide anything that touches compressor safety limits. Those stay with the engineer and the maker's settings.
Want to work out the AI layer for Exhaustwell? Talk to Yash →
Here's what can go south -
I think it's worth it for a founder with mechanical or utilities experience and access to asset finance. It is not a software business, so don't treat it like one.
Prove one thing first - that 10 skids in one cluster deliver at least 70% of predicted heat for three months without a compressor trip.
Plan for roughly ₹1.2–2.2 Cr, because you fund the skids yourself before the heat bills come in.
It can be, if each skid delivers most of its predicted heat and small firms pay on time. Collections and mismatched hot-water demand are the main threats.
Yes, screw compressors waste heat everywhere. Check local pressure-equipment rules and energy-efficiency schemes where you plan to sell.
The free Exhaustwell validation kit has the line-by-line capital breakdown, the effort scoring, the scheme and safety checklist, a 14-day validation sprint with pass/fail targets, a 90-day launch plan, 10 interview questions for plant owners and compressor dealers, and 5 assumptions to test. Download the kit →
Thinking about building Exhaustwell or something close to it? The make-or-break work is financing skids on your own books and still getting paid on time, and that's the sort of plan I help founders put together. If you need a hand, you know where to find me. Talk to Yash →
For illustration only. Names are fictional and ideas hypothetical; sourced facts are real but may be out of date. Nothing here is legal, financial or professional advice, and Yash Khatri is not personally liable for any use of it. Read the full disclaimer.