Complete technical details and performance specifications for the Radiant RS 21 E/3S
A J Wells and Sons
A O Smith
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The Radiant RS 21 E/3S delivers exceptional performance with a 80.4% efficiency rating, making it one of the most energy-efficient heating solutions available.
This Conventional boiler provides 26.6 - 26.6 (KW) of reliable heating power using Gas fuel for optimal performance.
Potential annual savings of £100-£250 compared to older, less efficient boilers, while reducing your carbon footprint.
Discover why the Radiant RS 21 E/3S is the perfect heating solution for your home
80.4% efficiency rating delivers maximum energy savings and optimal performance
Save £100-£250 annually on energy bills compared to older, less efficient boilers
Trusted Radiant engineering with comprehensive warranty coverage
Built to last with modern condensing technology and premium components
Discover other high-efficiency boilers that might be perfect for your home
Advanced tools designed specifically for the Radiant RS 21 E/3S to help you make informed decisions
Calculate specific savings with the Radiant RS 21 E/3S, including CO₂ reduction and payback period analysis.
Compare the Radiant RS 21 E/3S against other boiler models with detailed specifications and performance metrics.
Check if you qualify for a free Radiant RS 21 E/3S replacement through the government ECO4 scheme.
The Radiant RS 21 E/3S with its 80.4% efficiency rating is available at no cost through the government ECO4 scheme. Professional installation included with potential savings of £100-£250 annually.
✓ Government Approved ECO4 ✓ Radiant Authorized ✓ 80.4% Efficiency Rated ✓ Professional Installation
