False Profit Labs
built itself a wood-powered on-beach hot tub as a side project. After all the blowing stuff up
that we do, we decided that we needed break.
Basically, we took an inflatable hot tub out to the Ocean Beach here in San Francisco, filled it with salty ocean water, built a bonfire, set a heat exchanger up on top of the fire, and pumped the saltwater through the exchanger until we had a nice, hot tub to lounge around in.
Here's how we did it!
Note: Thanks to our photographer friend Loren
for taking some pictures at the beach. The well-lit nighttime photos are his. Naomi Dabby took our intro photo, below, at Priceless.