drain, fill, soak how fast can you?

[loosenupspas]

nlittel.....may be fill it from you hot water heater or a house faucet....30 hours is forever.....

[Brewman]

I wouldn't suggest filling your spa from your water heater, assuming it's a standard tank style.  Most of them only hold 40 or 50 gallons of water, and that will quickly be depleted into your spa.  At that point you'll just be pulling cold water from the tank faster than it can be heated.  So you'll be out of hot water for the length of time it takes all that cold water to get hot.  Many hours, possibly.
 
Once that  40 gallons of 120 degree water is mixed with several hundred gallons of cold water, you won't have gained much but an empty water heater.

[nlittle]

nlittel.....may be fill it from you hot water heater or a house faucet....30 hours is forever.....

Yeah, 30 hours is forever!  But, if I use my noggin, I will clean and refill in the morning and the next day/night I can be soaking...just need to have plans for that time.
As far as using my hot water, I have an on demand hot water system, no tank but I practically drain my well as it is while filling the tub, I don't want to work my furnace too.  
I can be patient.....I think.  OR I can upgrade to 220!

[mader]

wow....the 120v take a long time!

[Brewman]

Big deal- so you have to wait a day between water changes.  As long as your spa maintains it's heat while you're using it.