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HPWH Performance Report The Rheem units differ from the Sanden units in that they have multiple heating operation modes including using only the heat pump, just the backup electric element or both heat sources. Figure 12 below shows these distinct modes by showing the unit power consumption against the average inlet air temperature (or outside air temperature in all except Kelowna Site 3). Across the 4 sites the element uses on average around 5 kW while the heat pump alone uses between 300 and 450 watts. The middle data points are minutes in which the element ran for less than the full minute. The power meters provided pulses on 1-minute intervals that provided average power over that minute. The dense group of lower power minutes (between 280-599 watts) are when the unit was in heat pump only mode (heat pump compressor and fans were operating). Figure 12: Power vs. OAT All Rheem Units Avg. Outside Air Temp (°F) The power consumption of the original water heaters that were replaced was between 3kW and 4.5kW. With the Rheem unit consuming a peak load of 5.25 kW, the instantaneous demand (kW) increases from the baseline between 17%-75% depending on the water heater replaced, even though the energy consumption (kWh) decreases at all sites. 11PDF Image | CO2 Integrated Heat Pump Water Heater
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