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Detailed side-by-side comparison of efficiency ratings, specifications, and performance
Firebird
Boulter
Efficiency Winner
Firebird Boilerhouse S 120-150
Best Value
Both boilers are available free through the ECO4 scheme
Both Firebird Boilerhouse S 120-150 and Boulter Bonus 40/65 are available free through the ECO4 scheme. Check your eligibility and apply today.
