10 Year guarantee^*

Vortex Blue: External

Grant VortexBlue External oil-fired boilers combine durability with sophisticated ultra-low NOx burner technology.

Achieving incredible operating efficiencies, the VortexBlue External range features a high quality, external powder coated finish, built in frost protection, mains isolating switch and test switch. With sealed system kits available, the VortexBlue External oil boilers are installer friendly and simple to maintain.

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Features & benefits

*10 year guarantee when installed by a G1 Installer (Terms and Conditions apply)
Models include 15-21kW and 21-26kW boilers with sealed system kits available for all three boilers
Achieves 90.8-94.5% space heating efficiencies
Features market leading Riello RDB BLU blue flame compact burner
Factory fitted multi-directional flue supplied as standard, saving time when it comes to installation
High quality powder coated casing designed for durable operation outdoors
All the VortexBlue External modules can be converted to sealed system operation by purchasing a pre-assembled kit from Grant UK which includes an expansion vessel (size varies), automatic air vent, pressure relief valve and circulating pump. A filling loop and pressure gauge is also supplied with the kit and these can be fitted within the module casing, or ideally in a convenient site within the building, located between the cold main and central heating return

Martin Roberts warms up with a Grant VortexBlue

Case Study

Out with the old and in with the Blue!

Case Study

Working with blue flame burners

Heating engineers who are familiar with installing Grant Vortex oil-fired boilers will find the VortexBlue range straightforward to work with as well. Featuring Riello burner technology and Grant’s patented stainless steel heat exchanger, the VortexBlue boilers have been designed for simple installation, servicing and maintenance.

To learn more about the technology behind the VortexBlue range, please visit Grant UK’s YouTube channel to watch these videos: Introduction to the VortexBlue Range, Riello Blue Flame Burner Overview, and Riello Blue Flame Burner Commissioning & Fault Finding.