Comprehensive side-by-side analysis of efficiency ratings, specifications, and performance metrics
Head to Head
Grandee
GEM CC1 15/20
GEM • 89.1%
Both Boilers
Available FREE through ECO4 scheme
GEM CC1 15/20 offers superior efficiency at 89.1%, making it the better choice for long-term savings.
Both GEM CC1 15/20 and Grandee GCCF 15/23 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
