About the same. However the Epack has a lot more programming options, is much easier to use, install, and service.

I think that Pageup is right on the money when he says that you need to have neutral jumped to
L2.

Pageup wrote:

Do you have the Neutral power line input jumpered into L2 power input?

If not then you'll never get a complete circuit for the heater running on 115V.

One leg of the heater is connected via relay directly to L2.

Update: After ordering a new spa pack (but before installing it, luckily), another forum member was kind enough to point out that I had not correctly followed your earliest instructions here. After doing the above, well, everything started working. Duh! It's obvious that what my hot tub needs most is some basic education in AC circuitry for the owner. With PageUp's help, I surely know a lot more than when I began.

Everything appears to be working properly except for one thing: Although the digital temp display shows 104, the real temp, measured by two other thermometers, reads a steady and consistent 100/101. My body also tells me that we're way short of 104. This would seem to be some kind of calibration thing. I will begin a new post and hope we're able to correct the problem.

Thanks again for all your good counsel.
Craig