The Highlander
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You could get a small, dedicated on-demand (tankless) heater for about 220$. You'd have to check the specs and make sure it can produce enough hot water to serve a hot tub's needs though.
You could also just get a standard water heater dedicated for the tub. You might be able to find a cheap previously-used one off craigslist or at a habitat for humanity. They are not difficult to install or service. I installed or fixed a million of them at my old job. If you wait until I move to DC, I'd do it for the cost of pizza and beer.![]()
The tankless is great idea but the labor is not cheap for install the electric and other.
Up-front costs are high
The tankless water heaters we tested cost $800 to $1,150, compared with $300 to $480 for the regular storage-tank types. Tankless models need electrical outlets for their fan and electronics, upgraded gas pipes, and a new ventilation system. That can bring average installation costs to $1,200, compared with $300 for storage-tank models.
http://www.consumerreports.org/cro/...eaters/overview/tankless-water-heaters-ov.htm