Efficiency
Indicator |
Typical Tankless
Coil Boiler |
"High Efficiency"
Cast Iron Boiler |
System 2000 |
| AFUE Rating |
82% - 87% |
86% - 87% |
Up to 87% |
| Real Efficiency |
56% - 59% |
56% - 62% |
Up to 85% |
| Draft Regulator |
YES |
YES |
NO |
| Jacket Insulation |
¾" to 1" sides & top |
¾" to 1" |
Up to 4" |
| Base Insulation |
No - boiler sits directly on floor |
No |
YES insulated plus
boiler mounting stand |
| Outside Air for Combustion |
No |
Optional |
YES |
| Energy Saving Control |
Not applicable
or not an option |
Additional Cost and requires trial and error adjustments |
Energy Manager for combined heat and hot water standard on all systems. More efficient than indoor/outdoor reset controls |
| Integrated Hot Water System |
Coil in boiler for hot water or electric |
Coil in boiler (tankless coil) or indirect tank |
High performance hot water storage tank with integrated control |
