Mini Rainwater System
Technical Data Sheet
Document Reference: TDS-RW-MINI-001
Issue Date: February 2026
System: 76mm Mini with 50mm Round Downpipe
Product Description
The Kalsi Mini rainwater system is specifically designed for smaller structures where full-size guttering would look disproportionate or overwhelming. Perfect for sheds, summerhouses, garden rooms, porches, canopies, and small extensions, the compact profile provides effective drainage whilst maintaining visual balance with the structure.
System Dimensions
Gutter
| Dimension | Value | Tolerance |
|---|---|---|
| Profile width (top) | 76mm | ±1mm |
| Profile depth | 45mm | ±1mm |
| Wall thickness | 1.8mm | ±0.2mm |
| Available lengths | 2m, 4m | ±5mm |
| Weight | 0.32 kg/m | - |
Downpipe
| Dimension | Value | Tolerance |
|---|---|---|
| External diameter | 50mm | ±0.5mm |
| Internal diameter | 44mm | ±0.5mm |
| Wall thickness | 3.0mm | ±0.2mm |
| Available lengths | 2m, 2.5m | ±5mm |
| Weight | 0.35 kg/m | - |
Hydraulic Performance
Gutter Flow Capacity
| Gradient | Outlet Position | Flow Rate |
|---|---|---|
| 1:600 | End outlet | 0.65 L/s |
| 1:350 | End outlet | 0.80 L/s |
| Level | Centre outlet | 1.20 L/s |
Maximum Effective Roof Area
| Rainfall Intensity | Max Roof Area |
|---|---|
| 75mm/hr (standard) | 57m² |
| 100mm/hr (exposed) | 43m² |
| 150mm/hr (high exposure) | 29m² |
Material Specification
| Property | Specification |
|---|---|
| Material | PVC-U (unplasticised polyvinyl chloride) |
| Standard | BS EN 607:2004 |
| Formulation | Lead-free, cadmium-free |
| UV stabilisation | Co-extruded cap layer |
Colour Options
| Colour | Part Code Suffix | Availability |
|---|---|---|
| White | W | Standard stock |
| Black | BL | Standard stock |
| Brown | BR | Standard stock |
Product Range Summary
Gutters
| Description | Part Code | Pack Qty |
|---|---|---|
| 76mm Mini Gutter 2m | MG2* | 10 |
| 76mm Mini Gutter 4m | MG4* | 6 |
Angles
| Description | Part Code | Angle | Pack Qty |
|---|---|---|---|
| 90° Gutter Angle | MA90* | 90° | 25 |
| 135° Gutter Angle | MA135* | 135° | 25 |
Stop Ends & Outlets
| Description | Part Code | Pack Qty |
|---|---|---|
| External Stop End | ME1* | 100 |
| Internal Stop End | ME2* | 100 |
| Running Outlet | MO1* | 30 |
Brackets
| Description | Part Code | Pack Qty |
|---|---|---|
| Fascia Bracket | MK1* | 100 |
| Union Bracket | MU1* | 50 |
Downpipes
| Description | Part Code | Length | Pack Qty |
|---|---|---|---|
| 50mm Round Downpipe | MP2* | 2m | 10 |
| 50mm Round Downpipe | MP2.5* | 2.5m | 10 |
Downpipe Fittings
| Description | Part Code | Pack Qty |
|---|---|---|
| 92.5° Offset Bend | MB1* | 40 |
| 112.5° Offset Bend | MB2* | 40 |
| Pipe Shoe | MB3* | 40 |
| Pipe Clip | MC1* | 100 |
| Pipe Socket | MS1* | 75 |
Typical Applications
Ideal For
- Garden sheds and workshops
- Summerhouses and garden rooms
- Porches and canopies
- Small extensions
- Conservatory lean-tos
- Garages (small)
- Greenhouses
- Carports
- Bay window roofs
- Dormers (small)
When to Choose Standard Instead
- Roof area exceeds 40m²
- High rainfall area (Wales, Scotland, exposed sites)
- Building regulations apply (extensions over certain size)
- Connection to underground drainage required
Installation Guidelines
Gutter Installation
- Maximum bracket spacing: 600mm
- Near joints/fittings: Within 100mm
- Minimum fall: 1:600
- Expansion gap: 6mm at union joints
Notes
- Lightweight system - easy one-person installation
- Ideal for DIY projects
- May discharge to soakaway or water butt rather than drainage
Standards Compliance
- ✓ BS EN 607:2004
- ✓ Lead-free formulation
- ✓ ISO 9001:2015 manufactured
- ✓ UK manufactured
Guarantee
Product Guarantee: 10 years against manufacturing defects
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