End-Use Savings Shapes

Heat Pump Boiler With Gas Backup Measure Concept Replace natural gas boilers for HVAC application with air source heat pump boilers • Natural gas boiler backup . 140°F supply temperature Applicability • Applicable to 33% of stock floor area Doesn't apply to natural gas boilers serving condenser water loops Heat Pump Boiler Performance . . Sizing: Meet loads down to 17°F Compressor Lockout: -5°F Stock Boiler Prevalence Models with Boilers • Defrost: Integrated into performance curves Performance Data Source: Manufacturer data Models without Boilers 0% 20% 40% 60% 0% 20% 40% 60% % Stock Gas Heat % Stock Area Applicability False True NREL 31

View entire presentation