Comprehensive side-by-side analysis of efficiency ratings, specifications, and performance metrics
GEM
Head to Head
Johnson & Starley
Johnson & Starley QuanTec 24C
Johnson & Starley • 89.6%
Both Boilers
Available FREE through ECO4 scheme
Johnson & Starley QuanTec 24C leads with 89.6% efficiency, providing better performance and energy savings.
Both GEM CC1 15/20 and Johnson & Starley QuanTec 24C 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
