Grant Vortex Eco External 15-21 21kW Oil Heat Only Boiler

Product Description

The Grant Vortex Eco External 15-21 21kW Oil Heat Only Boiler is a reliable and efficient outdoor heating solution, ideal for homes with limited internal space. As part of Grant’s trusted external boiler range pioneers of outdoor oil boilers since 1986 this model delivers dependable central heating performance in a compact, weatherproof unit.

Designed for external installation, this floor-standing boiler features a durable casing and factory-fitted components for ease of installation and maintenance. The integrated Riello RDB burner ensures consistent and efficient operation, while the built-in frost stat protects the system in colder conditions.

With high efficiency levels of up to 90.8% and whisper-quiet operation, this boiler provides an excellent balance of performance, reliability, and energy savings for off-grid properties.

Why Customers Should Buy This Product

• External installation saves valuable indoor space
• 21kW output ideal for small to medium-sized homes
• High efficiency (up to 90.8%) reduces fuel costs
• Whisper-quiet operation for minimal disruption
• Built-in frost protection for cold weather reliability
• Riello RDB burner for dependable performance
• Factory-fitted components for easier installation
• Compact design with flexible pipe entry options
• Upgradeable warranty up to 5 years with approved installation
• Trusted quality from Grant

What’s Included

• 1 x Grant Vortex Eco External 21kW Heat Only Boiler
• Flue (included as standard)

Key Specifications

• Brand: Grant
• Range: Vortex Eco
• Product Type: Oil Heat Only Boiler (External)
• Output: 21kW
• Fuel Type: Oil
• ERP Rating: A
• Efficiency: 90.3% – 90.8% (SAP2009)
• NOx Class: Class 2
• Mounting Type: Floor Standing (External)

Dimensions:

• Height: 908 mm
• Width: 370 mm
• Depth: 800 mm

Performance:

• Heat Output: 21 kW
• BTU Output: 71,652 BTU
• CH Condensing Max Output: 21 kW
• Noise Level: 51 dB

Flue Options:

• Max Vertical (125mm): 12 m
• Max Vertical (100mm): 12 m
• Max Horizontal (125mm): 4 m
• Max Horizontal (100mm): 4 m

Features:

• Riello RDB burner
• Frost stat (factory set at 5°C)
• Factory-fitted condensate trap
• Optional pipe entry points
• Analogue display
• Solar compatible

Warranty:

• Standard: 1 Year
• Extended:
  • 2 Years (if registered within 30 days)
  • Up to 5 Years (with G1 installer & filter)

Installation & Compatibility

• Suitable for traditional heating systems with hot water cylinder
• Ideal for off-grid properties using oil fuel
• External floor-standing installation
• Compatible with Grant flue systems and accessories

What’s in the Box

• External Heat Only Boiler Unit
• Flue Components
• Installation Instructions

Important Information

• Heat only boiler – requires separate hot water cylinder and cold water storage tank
• Oil-fired system – requires oil storage tank
• Designed for outdoor installation