Comprehensive side-by-side analysis of efficiency ratings, specifications, and performance metrics
GEM
Head to Head
Johnson & Starley
Johnson & Starley QuanTec 16RK
Johnson & Starley • 89.7%
Both Boilers
Available FREE through ECO4 scheme
Johnson & Starley QuanTec 16RK leads with 89.7% efficiency, providing better performance and energy savings.
Both GEM CC2 20/26 and Johnson & Starley QuanTec 16RK 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
