The first gravity-to-vacuum conversion solution in the market
Sleek toilet frame with a vacuum discharge valve
Pairs seamlessly with most modern toilets
Delivers all aesthetics with one performance
Brings the full power of vacuum to conversions
First, let’s set the scene. See how Evac Vacuum and Evac VacuConvert is resetting plumbing in building conversions.
Urban development is at a watershed moment.
Recent studies show that one in five office buildings stands empty in the US. In Europe, the EU has pledged to renovate 35 million properties by 2030. Yet conventional gravity plumbing remains one of the biggest barriers, forcing costly demolition, restricting design choices, and consuming vast amounts of water.
Today it’s less about building more, and more about building smarter.
Construction drives 40% of emissions, but reuse cuts that by 50–75% while lowering costs, preserving heritage, and enabling faster, flexible projects. The era of building conversion and adaptive reuse is here — not as a trend, but as a necessity for resilience — delivering economic, environmental, and social value.
Economic
Reusing buildings avoids demolition and reduces construction costs. With faster project timelines and fewer material needs, adaptive reuse offers clear financial advantages.
Environmental
Keeps materials in circulation and buildings out of landfill. Cuts carbon emissions, minimises waste, and supports the shift toward a more circular construction economy.
Social
Gives buildings and neighbourhoods a second life. Supports local economies, protects cultural heritage, and helps fight urban sprawl through smarter development.
Evac vacuum is made for this moment.
Design without limits
No pitch, slab, or roof vents required — giving architects and engineers complete design freedom while preserving historic structures.
Demolition-free renovation
Avoid shutdowns and heavy excavation, cut raw material use, and complete projects 15–20% faster at significantly lower cost.
Save up to 90% water
Reduce consumption versus gravity systems, cut treatment plant needs, and streamline the path to green certifications.
Introducing Evac VacuConvert
Key features
The Evac VacuConvert features a sleek in-wall frame with a single smart vacuum discharge valve at its core, combining elegant design with powerful performance. By eliminating the need for pitch, slabs, or roof vents, it gives architects and engineers full creative freedom in conversion and adaptive reuse projects — all while preserving historic architecture.
Vacuum technology cuts raw material use, avoids shutdowns, and allows projects to be completed 15–20% faster at lower cost. It also reduces water consumption by 75–90% compared with gravity systems, minimizing treatment plant requirements and helping projects fast-track green certifications.
Key specifications
The Evac VacuConvert is built with a painted steel frame, supported by durable piping, valves, PP plastic parts, and NR rubber components. Its dimensions are 580 mm in width, 175–500 mm in depth, and 1140–1260 mm in height. Operating data includes a water supply pressure range of 0.3–10 bar, water consumption of 2.1–2.3 liters per flush (depending on bowl), and a tested maximum lift of 4 meters.
Toilet connections feature an inlet of Ø55±5 mm and an outlet of Ø102±5 mm with adjustable vertical placement. The unit weighs 22.0 kg. For detailed toilet bowl compatibility and certifications, refer to the technical data sheet.
a future with no waste
How much water and cost can you save?
Over the past 25 years, Evac vacuum systems have saved more than 255 million cubic metres of freshwater, and more than 1 million toilets have been delivered to our customers globally. Ready to see how much water and cost you can save with Evac vacuum toilets? Try the calculator and measure your impact!
Explore Evac vacuum portfolio for building conversions
Evac VacuConvert
Evac Optima 7 Vacuum Toilet
Evac Interface Unit
Evac HQE Collection Unit
defy gravity with vacuum technology
Evac VacuConvert is reshaping plumbing in building conversions
FAQ
Is there any risk of cross-contamination between the cistern and wastewater?
No. VacuConvert uses a physical air gap in the discharge pipe, which prevents backflow from the wastewater side into the cistern.
Which toilet models does VacuConvert work with?
VacuConvert is compatible with most modern wall-hung toilet bowls. Because bowl hydraulics differ by model, we verify each case—just share your bowl brand and model and we’ll confirm. A quick rule of thumb: modern washdown bowls are typically a good match; siphonic and flushometer types may also be compatible, but we’ll check performance case-by-case and advise on the best water-volume setting.
How much water does it use per flush?
The flush volume is adjustable. In practice, the recommended operating range is 2.2–4.0 litres (L) per flush, depending on the bowl. Our default setting is ~2.5 L/flush for consistent bowl-rinse coverage. Going below ~2.1 L can reduce how well the bowl surface is rinsed.
How does a VacuConvert system compare to a full vacuum toilet (e.g., Evac Optima®) for performance and water use?
Both use vacuum to remove waste efficiently from the bowl, so evacuation is equally decisive. The difference is in bowl rinsing:
• VacuConvert uses a gravity-fed cistern to rinse the bowl, so it typically runs 2.2–4.0 L/flush to maintain good surface rinse.
• Full vacuum toilets (e.g., Evac Optima®) use a pressure-assisted water valve, enabling significantly lower water volumes—as little as ~0.5 L/flush in certain models—while maintaining rinse and user comfort. If absolute minimum water use is the top priority, a full vacuum toilet is the benchmark.
What are the water-saving benefits versus traditional gravity systems overall?
At the system level, Evac vacuum plumbing typically uses 1–2 L/flush vs. 4–9 L/flush for gravity, helping projects achieve ~75–90% water savings depending on the configuration. VacuConvert lets you access those vacuum-system benefits while keeping your chosen bowl aesthetic.
How often does VacuConvert need servicing?
VacuConvert is designed for long service intervals. The most critical wear item is the flush valve inside the frame; we recommend replacement about every five years under normal use. We also offer service agreements that cover inspections, parts, and predictable budgeting.
What if I’m converting a complex or heritage building?
That’s exactly where vacuum shines: no slab cutting, no precise gravity slopes, and minimal risers—so you protect structures, shorten timelines, and avoid major shutdowns. Our team can assess placement flexibility and run a quick feasibility check for your layout.
Why Evac is the best place to buy vacuum solutions.
integrated portfolio
We have by far the largest waste and water management technology portfolio in the industry with 150 patents under our belt.
global operations
We have a presence on every marketable continent, represented in 70 countries, with offices in 14 of them worldwide.
Lifecycle service
We take care of your investment throughout its lifecycle no matter where you are, ensuring the enduring success of our installed systems.
innovation and sustainability
Sustainability is how we measure our success, so we innovate with the future in mind to ensure that our customers stay one step ahead.
Contact Evac vacuum systems team
Share a little bit about yourself, and let our expert team show you how Evac vacuum systems can help you achieve your sustainability goals and lead a future-proof business today and tomorrow.