Description
Grant Mag One DUO Magnetic Filter (VM01DUO)
28mm connections with an included 22mm reducer kit — engineered for heat pumps and high‑flow systems.
The Grant Mag One DUO Magnetic Filter (VM01DUO) is a high‑capacity, dual‑stage system protection filter designed for modern heating systems. With 28mm primary connections and a 22mm reducer kit included, it offers maximum flexibility for both large‑bore and standard domestic pipework.
Its dual‑action magnetic and mesh filtration captures both ferrous and non‑ferrous debris, protecting pumps, valves, plate heat exchangers and emitters from sludge‑related damage.
Why Installers Choose the Mag One DUO
Dual‑stage filtration for complete system protection.
- Magnetic + mesh filtration: Captures all debris types.
- Heat pump ready: Optimised for low‑temperature, high‑flow systems.
- Flexible installation: 28mm connections with 22mm reducers included.
- Fast servicing: Quick‑release body and easy drain‑off.
- Durable build: Heavy‑duty brass body and high‑temperature seals.
Key Features
High‑flow performance with dual‑action filtration.
| Feature | Benefit |
|---|---|
| Dual magnetic + mesh filtration | Captures all debris types for cleaner, more efficient systems |
| 28mm connections | Ideal for high‑flow heat pump circuits |
| 22mm reducer kit included | Compatible with standard domestic pipework |
| Compact, installer‑friendly design | Fits easily into modern plant layouts |
| Quick‑release service access | Faster maintenance and fewer call‑backs |
| Protects pumps, valves & exchangers | Extends system lifespan and reduces breakdowns |
Technical Highlights
Built for reliability and long‑term system protection.
- Model: VM01DUO
- Primary Connection Size: 28mm
- Included Reducers: 22mm
- Filtration Type: Magnetic + Non‑Magnetic (500 micron mesh)
- System Compatibility: Heat Pumps & Boilers
- Body Material: High‑grade brass
Perfect For
Ideal for both new installs and retrofit upgrades.
- Heat pump installations
- High‑flow 28mm systems
- Standard 22mm domestic systems (with reducers)
- System upgrades and retrofits
- Reducing sludge‑related breakdowns
- Protecting high‑value components
Installer FAQ
Is the Grant Mag One DUO suitable for heat pumps?
Yes — it’s optimised for high‑flow, low‑temperature systems.
What pipe sizes does the Mag One DUO fit?
28mm — it also comes with 22mm reducers included for full flexibility.
Does it filter non‑magnetic debris?
Yes — the mesh filter captures non‑magnetic particles that magnetic filters miss.
How often should the filter be serviced?
Once a year— Grant recommends annual servicing during routine system maintenance.
Can it be installed on existing systems?
Absolutely — it’s ideal for retrofits, upgrades, and new installations.
