It takes awhile to heat up.  If you plan on using it at 103 or more within 1 or days , you will need to keep the heat up around 100 or more.
Its very heavy you will need at least 3 moderately strong people to move it to where you want it.  The 2 men who dropped off the spa helped me move it.  I gave them a nice tip.  I was thrilled they gave me a hand.