How Haers Reduces Carbon Footprint in Stainless Steel Water Bottle Manufacturing

Most sustainability pages read the same way: a photo of recycled packaging, a picture of solar panels, a certification badge. For brand owners sourcing stainless steel drinkware, that’s rarely enough to answer the question that actually matters — where does the carbon in a water bottle actually come from, and what is the supplier doing about it at each stage of production?

That question has become harder to avoid. Buyers are increasingly asked to report Scope 3 emissions — the carbon embedded in what they purchase, not just what they burn in their own offices — and a supplier’s sustainability page rarely gives them numbers they can actually use. A photo of a solar panel doesn’t tell a procurement team how many kilowatt-hours it generates, or what share of a factory’s power it actually covers.

At Haers, we treat carbon reduction the same way we treat quality control: stage by stage, with a number attached to every step, and a paper trail behind every number. Here’s what that looks like across our water bottle manufacturing process, from raw steel to a finished bottle ready to ship.

1. Raw Materials: Starting From a Lower-Carbon Baseline

For any stainless steel product, the material itself is the single largest source of embodied carbon — often more than every later manufacturing step combined. Producing virgin stainless steel from raw ore requires mining, smelting, and refining at extremely high temperatures, and that energy cost is locked in long before a bottle is shaped. Two bottles that look identical on a shelf can carry very different carbon footprints, depending entirely on where the steel in each one came from.

We address this at the design and procurement stage, replacing traditional high-carbon virgin stainless with a lower-carbon stainless steel grade across our catalogue — not on one product line, but as a baseline standard applied to everything we produce. The result is a 30%+ reduction in carbon footprint per bottle before manufacturing even begins, simply from the choice of input material.

This choice is backed by third-party material certifications, so buyers don’t have to take our word for it:

• FSC (Forest Stewardship Council) — sustainably sourced wood and paper packaging components
• ISCC PLUS (International Sustainability and Carbon Certification, Plus) — traceable use of recycled and circular materials, verified back to the source
• RCS (Recycled Claim Standard) — independently verified recycled content, not a self-reported percentage

In 2023 alone, we used 1,753.45 tons of recycled material in production, reducing our reliance on virgin minerals and cutting 3,666.78 tons of CO₂ in the process. That’s not a pilot batch — it’s the scale we operate at across our normal production runs.

2. Forming and Processing: Cutting Energy Use at Each Production Step

Once material is sourced, the next carbon cost comes from turning raw steel into a finished bottle — precision forming, welding, polishing, and surface treatment. Each of these steps runs on electricity and heat, and at a production scale of millions of units a year, even small inefficiencies compound into a meaningful share of a factory’s total footprint.

Take forming as an example. Hydroforming shapes a bottle using high-pressure fluid rather than repeated mechanical stamping, which means fewer passes, less scrap metal, and less energy spent correcting defects downstream. Welding has moved in a similar direction — automated, precision-controlled processes reduce both energy use per unit and the rework that comes from inconsistent manual welds.

Beyond the processes themselves, we’ve upgraded the equipment running them across every relevant production stage:

• Waste heat recovery — heat that once escaped from air compressors and waste gas treatment is now captured and reused to heat cleaning water, instead of burning additional energy for the same job
• Variable-frequency preheating — machines adjust heating output to actual demand in real time, rather than running at full power continuously regardless of load
• Air compressor upgrades — compressors are among the largest energy draws in any metal-forming facility, and newer units deliver the same output for significantly less power

Combined, these upgrades have cut power demand by 80% on the equipment involved — not a marginal tweak, but a structural change in how much energy it takes to make the same bottle.

3. Energy Mix: Moving Manufacturing Off the Grid

Manufacturing runs on electricity, so where that electricity comes from matters just as much as how efficiently it’s used. Two factories running identical equipment can end up with very different carbon footprints depending entirely on their power source — which is why we’ve built a “solar + storage + green electricity” system across our production bases, one part of a broader sustainability program that runs through every stage of manufacturing.

Solar panels now cover more than 80% of available rooftop space across our facilities, generating over 14 million kWh a year — enough to offset a significant share of what our factories would otherwise draw from the grid. Because solar generation isn’t constant, a battery storage system holds that power in reserve for use at night or on cloudy days, so clean energy use doesn’t simply stop when the sun does. For whatever electricity we still need to buy, we prioritize green electricity from renewable sources over standard grid supply.

None of this works without visibility, so a digital energy management system tracks consumption in real time across our facilities. That matters more than it sounds: an efficiency leak that would once have shown up as a surprise on an annual utility bill now gets caught and corrected within days, not months.

This shift has cut an estimated 1,396 tons of CO₂ through solar adoption to date, with a zero-carbon factory as the long-term target we’re building toward.

4. Water and Waste: The Hidden Carbon Cost of Production

Carbon gets most of the attention in conversations about manufacturing sustainability, but water and waste management carry a carbon cost of their own — every ton of water pumped, treated, or trucked away takes energy, even before factoring in the environmental cost of water scarcity itself.

Since 2019, our manufacturing bases have reduced annual water use by 10–20% year over year, cutting total water consumption by 69% compared to 2012 levels. That reduction didn’t come from one big fix — it came from three measures working together:

• Rainwater collection for landscape irrigation and equipment cooling, saving roughly 157,000 tons of water a year
• Retrofitted washing facilities across production lines, saving an estimated 46,800 tons annually
• Closed-loop recycling of internal process water, so the same water gets reused within a cycle instead of drawn fresh each time, saving another 16,000 tons a year

Production waste follows a similar logic: it’s sorted at the source rather than mixed and sorted later, then routed through compliant, traceable disposal channels, with reduction targets attached to each category rather than a single blanket goal. Water conservation efforts alone have reduced emissions by 60.47 tons of CO₂ — a smaller number than the solar or materials figures, but one more proof point that the reduction strategy runs through every part of the operation, not just the ones that photograph well. For a fuller picture of how these pieces fit together on the factory floor, see our breakdown of what sustainability actually looks like inside a water bottle factory.

5. Third-Party Verification: How the Numbers Are Checked

None of the figures above carry much weight without independent verification — self-reported sustainability numbers are easy to write and hard to trust, which is exactly the gap third-party certification is meant to close. We’ve built a certification stack that covers both product-level and company-wide carbon accounting, rather than relying on a single badge to represent the whole operation:

• ISO 14064 — measures total greenhouse gas emissions across the entire company, not just one factory or product line
• ISO 14067 — measures the carbon footprint of individual products, down to a specific SKU
• ISO 14068 — certifies organization-wide carbon neutrality, the standard that ties the other two together into a single, audited claim

Haers is the first company in China’s drinkware industry to complete this full carbon-neutrality certification chain, and the first — and to date, the only — Chinese insulated water bottle manufacturer to hold BSCI product lifecycle carbon footprint verification. In 2023, we also received the first product carbon footprint verification statement in the stainless steel cup and bottle category issued by Bureau Veritas, along with the industry’s first independent GHG verification statement.

Our most recent audit, conducted independently by SGS, confirmed carbon-neutral status for full-year 2024 under ISO 14068-1:2023, with total emissions down 37% compared to 2021. That certification comes with a formal, documented commitment to maintain carbon neutrality through 2050 — not a one-time announcement, but a standard we’re required to keep meeting every year.

6. What This Means for Brand Buyers

For brands running supplier audits or reporting on Scope 3 emissions, manufacturing-stage data like this isn’t a marketing extra — it’s an input their own sustainability reporting depends on. A buyer who can’t get real numbers from a supplier ends up either estimating, which weakens their own disclosures, or spending weeks chasing documentation that should have been available from the start.

Because our figures already sit within recognized international frameworks — the ISO series, BSCI, FSC, RCS — they’re straightforward to fold into a buyer’s own audit trail without extra back-and-forth. That matters more as more markets move toward mandatory supply chain emissions disclosure rather than voluntary reporting.

More importantly, none of this is a one-time initiative. Lower-carbon materials, cleaner energy, tighter process controls, and independent verification all have to work together, continuously, for the numbers to hold up year after year — a single strong quarter doesn’t make a certification, and a single weak one can put it at risk. That’s the standard we hold our water bottle manufacturing process to — not because it’s required, but because it’s the only way the certifications stay meaningful for the brands relying on them.

Working With a Lower-Carbon Manufacturing Partner

Reducing carbon in stainless steel water bottle manufacturing isn’t a single fix you can point to on a factory tour. It runs through material selection, production equipment, energy sourcing, water management, and independent verification, all at once, all the time — and it only works if every piece holds up under scrutiny, not just the ones that make a good photo. If your brand is evaluating suppliers on this basis, we’re glad to share the certification documentation and production data behind these numbers, not just the headline figures.

Get in touch to talk about your next water bottle order, or request our latest product catalog to see what a lower-carbon supply chain looks like in practice — grade by grade, factory by factory, certificate by certificate.