The Grant Vortex Eco External 15–21kW is a high-efficiency oil boiler. Grant designed it specifically for outdoor installation in a strong, weatherproof casing. As a result, it provides consistent central heating while keeping fuel use and emissions low. Therefore, it is an excellent option for small to medium-sized homes that need both reliability and efficiency.
Key Features of the Grant Vortex Eco External 15–21kW
- ✅ 15–21 kW Output Range – Well suited to modest heating and hot water demand.
- ✅ External Floor-Standing Design – Weatherproof enclosure saves valuable indoor space.
- ✅ High Efficiency (90%+) – Advanced stainless-steel heat exchanger and condensing technology cut running costs.
- ✅ Low NOx Burner – Cleaner combustion that meets modern environmental standards.
- ✅ Service-Friendly Access – Engineers can quickly reach key components inside the protective casing.
- ✅ Quick Installation – Pre-plumbed and pre-wired setup reduces fitting time and disruption.
Why Choose This Grant Vortex Eco External 15–21kW Model?
- ✔️ Energy Efficient & Cost-Effective – It minimises oil consumption and, as a result, lowers your energy bills.
- ✔️ Built for Outdoors – Moreover, the robust casing provides long-term reliability in all UK weather conditions.
- ✔️ Quiet Operation – Low operating noise ensures your garden or outdoor space stays peaceful.
- ✔️ Future-Ready – In addition, the boiler supports HVO (Hydrotreated Vegetable Oil) blends for more sustainable heating.
This external boiler is a smart choice when indoor space is limited or when heating outbuildings from a single outdoor plant location. In addition, our G1 accredited installation and HeatCover V4 plan provide long-term support and peace of mind. Consequently, the Grant Vortex Eco External offers dependable, efficient performance year after year.
For full technical specifications, visit the official Grant UK Vortex Eco External product page
What’s Included with Installation
- Standard horizontal flue
- System flush
- Corrosion inhibitor
- Condensate pipework installation
- Room thermostat and programmer
- Registration with local authorities and manufacturer
- Grant Mag One Duo filter
Installation & Service Area for the Vortex Eco External 15–21 kW
Please note: This boiler comes with standard installation.
We provide installations across the East Anglia region.
For full installation criteria, please see our
Terms & Conditions.
