Starting to see more air to water HP's. NRCan's instructions are as follows:

7.14.9.2 Modelling an air to water heat pump
Model the space heating component of the system as an air source heat pump. Use HOT2000’s default COP of 2.0. Enter the heating capacity if known, otherwise use the default value. For instructions on how to model a heat pump, see section 7.14.9.1.

If the air-to-water heat pump is also used for domestic hot water, model the hot water system as an electric tank, specifying the assessed tank type (i.e. Conventional tank or Conserver tank) and volume. Use the energy factor defaulted by HOT2000.

I'm curious if folks have a better way if it uses NRCan's HP calculator?

Hey Jack,

HUG??  Not Tracking what that means.

I have a New Home coming through our program with a SANCO2 unit doing both DHW and Slab heat.  EA/SO unsure how to proceed.  THis is an ENERGYSTAR unit that can heat down to -20 F (-29C)   Seems the default modeling procedure is not capturing the efficiency.

Thanks,

Jeffrey

LOL  Thanks Toby - W2AH! (Welcome to Acronym Hell!)  

Yeah I posted it.  I found it after I posted here.  The report is from 2022.