The Grant Vortex Eco Internal 15–21 kW Oil Boiler is a high-efficiency, condensing boiler
designed for indoor installation. Compact and reliable, it delivers consistent central heating while keeping
fuel consumption and emissions low. Perfect for smaller to medium-sized homes, this Eco model combines
advanced Grant technology with a space-saving design.
Key Features of the Vortex Eco Internal Boiler (15–21 kW)
- ✅ 15–21 kW Output Range – Ideal for homes with modest heating and hot water needs.
- ✅ Internal Floor-Standing Design – Slimline boiler, perfect for kitchens or utility rooms.
- ✅ High Efficiency (90%+) – Uses Grant’s stainless-steel heat exchanger and condensing technology to cut fuel bills.
- ✅ Low NOx Burner – Meets modern environmental standards for cleaner combustion.
- ✅ User-Friendly Controls – Easy to operate and service with front access to components.
- ✅ Quick Installation – Pre-plumbed and pre-wired to save on fitting time.
Why Choose this Grant Vortex Eco Model?
- ✔️ Energy Efficient & Cost-Effective – Designed to minimise fuel consumption and running costs.
- ✔️ Durable Build Quality – Manufactured with premium components for long-term reliability.
- ✔️ Quiet Performance – Low operating noise makes it well suited to indoor installation.
- ✔️ Future Ready – Compatible with HVO (Hydrotreated Vegetable Oil) biofuel blends.
This internal boiler is a great choice for homeowners seeking a compact, efficient, and eco-conscious heating solution.
Combined with our G1 accredited installation status and our HeatCover V4 plan
Grant Vortex Eco will give you many trouble-free years of service.
For full technical specifications, please visit the
official Grant UK Vortex Eco Internal 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 15–21 kW
Please note: This boiler is supplied with standard installation.
We only install boilers in the East Anglia region.
For standard installation criteria, please see our
Terms & Conditions
