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Detailed side-by-side comparison of efficiency ratings, specifications, and performance
Boulter
British / Scottish Gas
Efficiency Winner
Boulter Bonus 40/65
Best Value
Both boilers are available free through the ECO4 scheme
Both Boulter Bonus 40/65 and British / Scottish Gas RD1 340 are available free through the ECO4 scheme. Check your eligibility and apply today.
