Comprehensive side-by-side analysis of efficiency ratings, specifications, and performance metrics
Head to Head
Boulter
Baxi 400 424 COMBI
Baxi • 89.0%
Both Boilers
Available FREE through ECO4 scheme
Baxi 400 424 COMBI offers superior efficiency at 89.0%, making it the better choice for long-term savings.
Both Baxi 400 424 COMBI and Boulter Bonus 40/65 are available at no cost through the government ECO4 scheme. Take the next step today.
✓ Government Approved Scheme ✓ No Hidden Costs ✓ Professional Installation ✓ Energy Efficient
