Complete technical details and performance specifications for the Keston Thermomatic RSM20FB
A J Wells and Sons
A O Smith
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The Keston Thermomatic RSM20FB delivers exceptional performance with a 78.1% efficiency rating, making it one of the most energy-efficient heating solutions available.
This Combi boiler provides 23 - 23 (KW) of reliable heating power using Gas fuel for optimal performance.
Potential annual savings of £50-£200 compared to older, less efficient boilers, while reducing your carbon footprint.
Discover why the Keston Thermomatic RSM20FB is the perfect heating solution for your home
78.1% efficiency rating delivers maximum energy savings and optimal performance
Save £50-£200 annually on energy bills compared to older, less efficient boilers
Trusted Keston 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 Keston Thermomatic RSM20FB to help you make informed decisions
Calculate specific savings with the Keston Thermomatic RSM20FB, including CO₂ reduction and payback period analysis.
Compare the Keston Thermomatic RSM20FB against other boiler models with detailed specifications and performance metrics.
Check if you qualify for a free Keston Thermomatic RSM20FB replacement through the government ECO4 scheme.
The Keston Thermomatic RSM20FB with its 78.1% efficiency rating is available at no cost through the government ECO4 scheme. Professional installation included with potential savings of £50-£200 annually.
✓ Government Approved ECO4 ✓ Keston Authorized ✓ 78.1% Efficiency Rated ✓ Professional Installation
