Description
The Grant Vortex Pro Internal 46–70kW Heat Only is a high-output, high-efficiency internal oil boiler designed to meet the heating demands of large homes and properties with higher heat requirements. Engineered for reliability and long-term performance, this powerful boiler delivers consistent central heating while maintaining excellent efficiency and low emissions.
With its robust floor-standing internal design, the Vortex Pro 46–70kW is ideal for installation in utility rooms, plant rooms, or garages, where space allows for a larger-capacity heating appliance. This heat-only model is designed to work with a hot water cylinder, making it suitable for traditional and upgraded heating systems.
Key Features of the Grant Vortex Pro Internal 46–70kW
✅ 46–70 kW Output Range – Designed for high heating and hot water demand.
✅ Internal Floor-Standing Design – Ideal for large properties with dedicated boiler space.
✅ High Efficiency (90%+) – Condensing technology and stainless-steel heat exchanger help reduce fuel consumption.
✅ Low NOx Burner – Cleaner combustion that meets modern environmental standards.
✅ Premium Build Quality – Supplied with a high-performance Riello oil burner for reliability and longevity.
✅ Service-Friendly Design – Front access to key components for easier maintenance.
Why Choose the Grant Vortex Pro Internal 46–70kW Oil Boiler?
✔️ Powerful & Reliable – Built to handle larger heating systems with ease.
✔️ Energy Efficient & Cost-Effective – Helps reduce oil usage despite higher output demands.
✔️ Quiet Operation – Suitable for internal installation without excessive noise.
✔️ Future-Ready – Compatible with HVO (Hydrotreated Vegetable Oil) biofuel blends.
The Grant Vortex Pro range is designed for homeowners who need higher output without compromising efficiency or reliability. When installed professionally and serviced regularly, this boiler delivers dependable heating performance year after year.
For full technical specifications, visit the official Grant UK Vortex Pro Internal product page.
Enhance peace of mind with our HeatCover+ V4 plan
and our G1-accredited installation for dependable support and long-term performance.
What’s Included with Installation
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Standard horizontal flue
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System flush
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Corrosion inhibitor
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Condensate pipework installation
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Room thermostat and programmer
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Registration with local authorities and manufacturer
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Grant Mag One Duo filter
Installation & Service Area
Please note: This boiler includes standard installation.
We only install boilers in the East Anglia region.
For full installation criteria, please see our Terms & Conditions.

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