At work... on my own time, of course.
I work at a compressor station in the middle of the California desert along the Colorado River, that brings natural gas from out of state and sends it on to the urban areas. When it was built in 1948, the company needed some incentives to convince people to relocate (we're talking pre-central A/C). Among the perks included with company housing were a swimming pool, and a complete outdoor kitchen under a roof next to it...
If you fire up one of those commercial stove burners, it'll bring five gallons to a boil with no problem. And the deep sinks are a perfect place to cool off the wort after the boil, expecially since we have 3 separate ice machines on the premises.