If you are modeling a water heater and the efficiency is given in COP, you can convert this to EF the following way:
If the water heater is tankless then use the COP as the EF directly.
If there's a tank then take the EF determined above and derate it by a factor between 0.8 & 0.85 as described in our Conditioning Equipment help (which assumes a boiler but the same logic applies for a heat pump; screenshot below).
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