Answer a few questions about your property and we'll estimate your annual rainwater harvest, mains-water savings, and the system scale you'd need. Built on real local rainfall and tariff data.
Who is this for?
This shapes how we model your demand and the system we'd design.
mm/yr
€/m³
Auto-filled from your region — edit either box if you have your own figures (e.g. from a water bill).
Your collection area
Rainwater is captured from roofs and hard surfaces. Larger area means more harvest.
m²
Not sure? A typical house roof is 100–200 m². A commercial unit can be 1,000 m²+. Use rough estimates — you can refine later.
Usage and storage
Tells us your demand and how much winter water you can hold for summer.
people
m³/yr
No bill handy? Leave blank and we'll estimate from occupancy and property type.
40 m³
Drag to set tank capacity. 40 m³ ≈ four shipping-container-sized tanks. Leave at default if unsure.
Estimated annual saving
£0
0 m³
Mains water saved / year
0%
Of your demand covered
0
Litres saved / year
Recommended storage
0 m³
Water credits (CSRD-ready)
0 m³ verified
Where the savings come from
Recommended greywater unit
—
Monthly harvest vs. demand
Harvest Monthly demand
Get your full feasibility assessment
Fill in your details and we'll open a pre-filled email — just send it to reach an Asile specialist, who will follow up with a costed system design. Your estimate is included automatically.
Almost there. We've opened a pre-filled email with your details and estimate. Please send it using your default email provider to reach the Asile team.
Estimates use local average rainfall and published water tariffs, applying a capture-efficiency factor for first-flush diversion, filtration and overflow losses (per BS EN 16941-1 / BS 8515 best practice). Actual yield depends on roof material, storage sizing, seasonal demand and storm intensity. This tool is an indicative planning aid, not a guaranteed performance figure or a quotation.