I've been comparing energy use for different DHW heaters in the DD
Wizard (eQuest v3.63) and it appears that changing the thermal
efficiency fraction has no effect on DHW energy usage. However, when I
go into detailed edit mode and change the Heat Input Ratio under the DHW
water heater tab the expected change in energy use occurs.

Also, the default value of 80% thermal efficiency in the Wizard displays
as a 1.37 heat input ratio in the detailed edit mode. Can anyone verify
this or tell me what I'm doing wrong?
--

Jacob Goodman , LEED AP