Table 6 COPs of HPX 5by Supply Water Temperatures and Outdoor Temperatures (at 60Hz)
See charts in Specification section for capacity and COP details on both models across their
modulation ranges. It is always best practice for any heat pump to design for a supply temperature
maximum of 120°F. If the existing heat distribution system operates at higher temperature, consider
these options:
Reduce the heat loss of the building. Upgrading windows and attic insulation will reduce the
required size and temperatures of the equipment.
Add to the existing heat emitters: the greater the thermal mass of the emitters, the lower the
water temperature needs to be. Tighter radiant tube spacing also has the effect of boosting
heat emission.
Install supplemental heating source to boost the system water temperature as required.
Example: Electric boiler or gas boiler.
6.3 Important Design Considerations
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