Comprehensive side-by-side analysis of efficiency ratings, specifications, and performance metrics
Boulter
Head to Head
GEM CC1 15/20
GEM • 89.1%
Both Boilers
Available FREE through ECO4 scheme
GEM CC1 15/20 leads with 89.1% efficiency, providing better performance and energy savings.
Both Boulter Bonus 65/90A and GEM CC1 15/20 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
