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Vortex Pro: External

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The Grant Vortex Pro external models combine our existing proven condensing boiler technology with the latest Riello RDB low NOx compact burner.

The Vortex Pro Range of external modules offers the same unique features as the Eco External modules including the factory fitted multi-directional flue, high quality external powder coated casing, built in frost protection, mains isolating switch and a test switch. However, in addition, the boilers have a higher efficiency level and are factory wired to receive an ‘optional’ RF (radio frequency) wireless programmer. In this situation, the receiver can be plugged into the control panel of the module, enabling the boiler to be operated using a remote controller from any room inside the house, without the need for hard wiring.


Sealed System Kits

The Grant Pro range of Standard Vortex external modules can be converted to sealed system operation by purchasing a pre-assembled kit from Grant UK. The sealed system kit includes an expansion vessel (size varies), automatic air vent, pressure relief valve and circulating pump. A filling loop and pressure gauge are also supplied as part of the kit. 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. Low NOx Ready

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Grant Vortex Oil Condensing Range Brochure - October 2018
Grant Vortex Pro External (installer & user) - UK - DOC 0052 - Rev 1.0 - May 2012
Grant Vortex burner settings - UK - DOC 0140 - Rev 1-0 - October 2018.pdf
Grant Vortex Pro External (low NOx) addendum - ADD 0121 - Rev 0.1.pdf


Most impressed Retired Engineer
Bought as a replacement for an oil fired range boiler, our favourite plumber installed the Grant boiler withou...
Graham Stanley
boiler installed to replace old one
Recently had Grant boiler installed to replace old one. Find the boilers excellent
T Taylor
Fantastic oil boiler,sitting outside
Fantastic oil boiler,sitting outside and freed up the garage space,super quiet,very efficient,love it. Grant Vortex Mag One Magnetic Filter

View models EZ-Fit External Low Level / High Level Flues (Green System) for internal boilers

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 19th century cottage now being heated by a Vortex Pro boiler

